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All questions of Matter and Materials for Primary 6 Exam
Select odd from the following
- a)Spade
- b)Eraser
- c)Tawa
- d)Pressure cooker
Correct answer is option 'B'. Can you explain this answer?
Select odd from the following
a)
Spade
b)
Eraser
c)
Tawa
d)
Pressure cooker
|
Prachi Singh answered |
All the things belong to kitchen except eraser
Choose the opaque materials form the following- a)Thin sheet of plastic
- b)Glass container.
- c)Wooden door
- d)Clear water
Correct answer is 'C'. Can you explain this answer?
Choose the opaque materials form the following
a)
Thin sheet of plastic
b)
Glass container.
c)
Wooden door
d)
Clear water
|
Vikas Choudhury answered |
Wooden door is an opaque object as it has all the properties of one:
1. Opaque materials are those through which light cannot pass at all.
2. We cannot see through these objects. They can also be called not-see-through objects.
3. The color of this material depends on the light it absorbs.
4. An object on the other side of this material is not visible at all.
The state of matter which has a definite volume but no definite shape- a)Solid
- b)Liquid
- c)Gas
- d)Mixture
Correct answer is 'B'. Can you explain this answer?
The state of matter which has a definite volume but no definite shape
a)
Solid
b)
Liquid
c)
Gas
d)
Mixture
|
Rishika Basak answered |
The state of matter which has a definite volume but no definite shape is called as liquid.
Select the translucent materials from the following?- a)Glass tumbler
- b)Aluminium foil
- c)Muslin cloth
- d)Mirror
Correct answer is 'C'. Can you explain this answer?
Select the translucent materials from the following?
a)
Glass tumbler
b)
Aluminium foil
c)
Muslin cloth
d)
Mirror
|
Anjali Kapoor answered |
Muslin cloth is the example of translucent cloth while tericot is the example of opaque cloth material. Any material which will be completely transparent will not be used as cloth material.
Which one is not a transparent object?- a)Clean water
- b)Glass
- c)Thin sheet of plastic
- d)Muddy water
Correct answer is option 'D'. Can you explain this answer?
Which one is not a transparent object?
a)
Clean water
b)
Glass
c)
Thin sheet of plastic
d)
Muddy water
|
Charvi Sen answered |
The object through which light passes easily are called as transparent object. Clean glass, glass and thin sheet of plastic are transparent while muddy water is translucent.
Which pair of substance float in water
- a)Pin, oil drops
- b)Thermocol, chalk
- c)Plastic ball, feather
- d)Coin, rubber band
Correct answer is option 'C'. Can you explain this answer?
Which pair of substance float in water
a)
Pin, oil drops
b)
Thermocol, chalk
c)
Plastic ball, feather
d)
Coin, rubber band
|
Anjana Rane answered |
Those substances that have less density than water floats on water surface such as plastic ball and feather.
Perfume is a substance which is - a)Malleable
- b)Volatile
- c)Sublime
- d)Non-volatile
Correct answer is option 'B'. Can you explain this answer?
Perfume is a substance which is
a)
Malleable
b)
Volatile
c)
Sublime
d)
Non-volatile
|
|
Athul Chatterjee answered |
Volatility is a material quality which describes how readily a substance vaporizes.
All metals are ----------- of heat and electricity.- a)Insulator
- b)Semi-conductor
- c)Good conductor
- d)Bad conductor
Correct answer is option 'C'. Can you explain this answer?
All metals are ----------- of heat and electricity.
a)
Insulator
b)
Semi-conductor
c)
Good conductor
d)
Bad conductor
|
Kunal Mehta answered |
In metals, some of the electrons (often one per atom) are not stuck to individual atoms but flow freely among the atoms. Of course, that's why metals are such good conductors of electricity.
Why do shopkeepers use transparent containers for biscuits, sweets, and other eatables?- a)To prevent air exposure
- b)To enhance the taste
- c)To easily display the items
- d)To keep the items fresh
Correct answer is option 'C'. Can you explain this answer?
Why do shopkeepers use transparent containers for biscuits, sweets, and other eatables?
a)
To prevent air exposure
b)
To enhance the taste
c)
To easily display the items
d)
To keep the items fresh
|
Vp Classes answered |
Shopkeepers use transparent containers for biscuits, sweets, and other eatables so that buyers can easily see them. This practice helps in showcasing the products to customers, allowing them to view the items clearly without the need to open the containers. It can attract customers and make the products more appealing.
Which among the following materials are not lustrous- a)Silver
- b)Gold
- c)Diamond
- d)Wood
Correct answer is option 'D'. Can you explain this answer?
Which among the following materials are not lustrous
a)
Silver
b)
Gold
c)
Diamond
d)
Wood
|
Pritam Shah answered |
Those substances that have shining surface are called as lustrous substance. Diamond, gold and silver are lustrous
Chair, table and plough are made up of- a)Plastic
- b)Iron
- c)Wood
- d)Paper
Correct answer is option 'C'. Can you explain this answer?
Chair, table and plough are made up of
a)
Plastic
b)
Iron
c)
Wood
d)
Paper
|
|
Tushar Iyer answered |
Chair, table and plough are made up of wood obtained from plants.
Can you explain the answer of this question below:Which type of material is used to make wind screen of a car?
- A:
Transparent
- B:
Translucent
- C:
Opaque
- D:
Semi-transparent
The answer is A.
Which type of material is used to make wind screen of a car?
Transparent
Translucent
Opaque
Semi-transparent
|
|
Bijoy Goyal answered |
Material Used to Make Windscreen of a Car
The windscreen of a car is an essential component that protects the driver and passengers from wind, rain, dust, and other external elements. It is a transparent screen made of a special type of material that provides excellent visibility to the driver. The material used to make the windscreen of a car is:
Transparent
Transparent materials allow light to pass through them without scattering the light. The windscreen of a car is made of transparent materials such as glass, polycarbonate, or acrylic. The choice of material depends on the manufacturer's preference and the type of car. Glass is commonly used in high-end cars, while polycarbonate and acrylic are used in budget cars.
Glass
Glass is a brittle and transparent material made by melting silica with other materials. The glass used in car windscreens is tempered glass, which is heated and cooled rapidly to make it stronger and more durable. Tempered glass is resistant to impact and shattering, making it an ideal material for car windscreens.
Polycarbonate
Polycarbonate is a transparent and lightweight thermoplastic material that is commonly used in car windscreens. It is highly resistant to impact, shattering, and UV radiation, making it an excellent material for car windscreens. Polycarbonate is also more flexible than glass, making it less prone to cracking or breaking.
Acrylic
Acrylic is a transparent thermoplastic material that is commonly used in budget cars. It is less expensive than glass and polycarbonate, making it an affordable option for car windscreens. However, acrylic is less durable than glass and polycarbonate and is more prone to scratching and cracking.
Conclusion
In conclusion, the material used to make the windscreen of a car is transparent. Glass, polycarbonate, and acrylic are the most commonly used materials for car windscreens. The choice of material depends on the manufacturer's preference and the type of car.
The windscreen of a car is an essential component that protects the driver and passengers from wind, rain, dust, and other external elements. It is a transparent screen made of a special type of material that provides excellent visibility to the driver. The material used to make the windscreen of a car is:
Transparent
Transparent materials allow light to pass through them without scattering the light. The windscreen of a car is made of transparent materials such as glass, polycarbonate, or acrylic. The choice of material depends on the manufacturer's preference and the type of car. Glass is commonly used in high-end cars, while polycarbonate and acrylic are used in budget cars.
Glass
Glass is a brittle and transparent material made by melting silica with other materials. The glass used in car windscreens is tempered glass, which is heated and cooled rapidly to make it stronger and more durable. Tempered glass is resistant to impact and shattering, making it an ideal material for car windscreens.
Polycarbonate
Polycarbonate is a transparent and lightweight thermoplastic material that is commonly used in car windscreens. It is highly resistant to impact, shattering, and UV radiation, making it an excellent material for car windscreens. Polycarbonate is also more flexible than glass, making it less prone to cracking or breaking.
Acrylic
Acrylic is a transparent thermoplastic material that is commonly used in budget cars. It is less expensive than glass and polycarbonate, making it an affordable option for car windscreens. However, acrylic is less durable than glass and polycarbonate and is more prone to scratching and cracking.
Conclusion
In conclusion, the material used to make the windscreen of a car is transparent. Glass, polycarbonate, and acrylic are the most commonly used materials for car windscreens. The choice of material depends on the manufacturer's preference and the type of car.
The state of matter which has no fixed shape but has definite volume is the- a)Gasous state.
- b)Liquid state.
- c)Solid state.
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
The state of matter which has no fixed shape but has definite volume is the
a)
Gasous state.
b)
Liquid state.
c)
Solid state.
d)
None of these
|
|
Harshad Goyal answered |
Matter in the liquid state has no fixed shape but has definite volume.
Which one will show a metallic lustre?- a)Any surface of a metal
- b)Freshly cut surface of a metal
- c)Freshly cut surface of non-metal
- d)Surfaces of all materials
Correct answer is option 'B'. Can you explain this answer?
Which one will show a metallic lustre?
a)
Any surface of a metal
b)
Freshly cut surface of a metal
c)
Freshly cut surface of non-metal
d)
Surfaces of all materials
|
|
Nishanth Iyer answered |
Metals when cut, their freshly cut surface has shining.
Can you explain the answer of this question below:If a substance can be beaten into thin sheet, it is called
- A:
Brittle
- B:
Malleable
- C:
Good conductor
- D:
Ductile
The answer is B.
If a substance can be beaten into thin sheet, it is called
Brittle
Malleable
Good conductor
Ductile
|
Pooja Shah answered |
The property of metals by which they can be beaten into thin sheets is called malleability. Most metals are malleable. Gold and silver are the best malleable metals and can be hammered into very fine sheets or foils.
Hardest known natural substance is- a)Mercury
- b)Wood
- c)Gold
- d)Diamond
Correct answer is option 'D'. Can you explain this answer?
Hardest known natural substance is
a)
Mercury
b)
Wood
c)
Gold
d)
Diamond
|
Rajeev Sen answered |
Diamond is the hardest naturally occurring substance found on Earth. But it is not the hardest substance. Wurtzite boron nitride (synthetic) and lonsdaleite (which comes from meteorites) are both harder.
Which one is a combustible substance?- a)Ghee
- b)Solid carbon dioxide
- c)Liquid nitrogen
- d)Water
Correct answer is option 'A'. Can you explain this answer?
Which one is a combustible substance?
a)
Ghee
b)
Solid carbon dioxide
c)
Liquid nitrogen
d)
Water
|
|
Jay Goyal answered |
Combustible Substance: Ghee
Non-Combustible Substances: Solid Carbon Dioxide, Liquid Nitrogen, Water
Flash Point and Combustion
Importance of Knowing Combustible Substances
Conclusion
Ghee is a type of clarified butter that is commonly used in Indian cuisine. It is a combustible substance because it can catch fire and burn easily. It has a low flash point, which means that it can ignite at a relatively low temperature.
Non-Combustible Substances: Solid Carbon Dioxide, Liquid Nitrogen, Water
On the other hand, solid carbon dioxide (also known as dry ice), liquid nitrogen, and water are non-combustible substances. They do not readily catch fire or burn when exposed to heat or flame.
Flash Point and Combustion
The flash point is the lowest temperature at which a substance can vaporize to form an ignitable mixture in air. When a combustible substance is exposed to heat or flame above its flash point, it can catch fire and burn. Non-combustible substances, on the other hand, have a high flash point and do not readily ignite or burn.
Importance of Knowing Combustible Substances
It is important to know which substances are combustible and which are not, as this knowledge can help prevent accidents and fires. Combustible substances should be stored and handled with care, and precautions should be taken to prevent them from coming into contact with heat or flame.
Conclusion
In summary, ghee is a combustible substance, while solid carbon dioxide, liquid nitrogen, and water are non-combustible. Knowing which substances are combustible is important for safety and accident prevention.
Which of the following is a chemical change?- a)Melting of butter
- b)Boiling of milk
- c)Souring of milk
- d)Shredding of paper
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a chemical change?
a)
Melting of butter
b)
Boiling of milk
c)
Souring of milk
d)
Shredding of paper
|
Aryan Joshi answered |
Explanation:
Chemical change is a process that involves a chemical reaction, resulting in the formation of new substances with new properties. Let's analyze each option to determine which is a chemical change.
A. Melting of butter: When butter melts, it changes from a solid to a liquid state but the chemical composition of the butter remains the same. Therefore, it is a physical change, not a chemical change.
B. Boiling of milk: When milk is boiled, it changes from a liquid to a gas state. However, the chemical composition of the milk remains the same. Therefore, it is also a physical change, not a chemical change.
C. Souring of milk: When milk sours, it undergoes a chemical reaction, in which the lactose (a sugar) present in milk is converted into lactic acid by the action of bacteria. This changes the chemical composition of milk, making it sour in taste. Therefore, souring of milk is a chemical change.
D. Shredding of paper: When paper is shredded, it is still made up of the same chemical composition as before. Therefore, shredding of paper is also a physical change, not a chemical change.
Conclusion: The correct answer is option C, souring of milk, which is a chemical change because it involves a chemical reaction resulting in the formation of a new substance with new properties.
Chemical change is a process that involves a chemical reaction, resulting in the formation of new substances with new properties. Let's analyze each option to determine which is a chemical change.
A. Melting of butter: When butter melts, it changes from a solid to a liquid state but the chemical composition of the butter remains the same. Therefore, it is a physical change, not a chemical change.
B. Boiling of milk: When milk is boiled, it changes from a liquid to a gas state. However, the chemical composition of the milk remains the same. Therefore, it is also a physical change, not a chemical change.
C. Souring of milk: When milk sours, it undergoes a chemical reaction, in which the lactose (a sugar) present in milk is converted into lactic acid by the action of bacteria. This changes the chemical composition of milk, making it sour in taste. Therefore, souring of milk is a chemical change.
D. Shredding of paper: When paper is shredded, it is still made up of the same chemical composition as before. Therefore, shredding of paper is also a physical change, not a chemical change.
Conclusion: The correct answer is option C, souring of milk, which is a chemical change because it involves a chemical reaction resulting in the formation of a new substance with new properties.
Newspaper, a book, a copy, a diary are made up of- a)Leather
- b)Wood
- c)Plastic
- d)Paper
Correct answer is option 'D'. Can you explain this answer?
Newspaper, a book, a copy, a diary are made up of
a)
Leather
b)
Wood
c)
Plastic
d)
Paper
|
|
Poulomi Nair answered |
Newspaper, a book, a copy, a diary are made up of paper obtained from plants.
Which of the following is not a physical change?
- a)Tearing of Paper
- b)Freezing of ice
- c)Rusting of iron
- d)Breaking of Furniture
Correct answer is option 'C'. Can you explain this answer?
Which of the following is not a physical change?
a)
Tearing of Paper
b)
Freezing of ice
c)
Rusting of iron
d)
Breaking of Furniture
|
Edu Impact answered |
Melting of wax is a physical change as the original substance, wax, can be obtained back by solidifying it.
Substance 'P' does not have a fixed volume. It occupies the total space of the container and it can be compressed. What is 'P' likely to be?- a)Solid
- b)Liquid
- c)Gas
- d)All of these
Correct answer is option 'C'. Can you explain this answer?
Substance 'P' does not have a fixed volume. It occupies the total space of the container and it can be compressed. What is 'P' likely to be?
a)
Solid
b)
Liquid
c)
Gas
d)
All of these
|
|
Rounak Patel answered |
Gases have no strong bonds between the atoms. They can be compressed.
What is the term used for liquids that mix with each other?- a)Miscible liquids
- b)Immiscible liquids
- c)Molecules
- d)Atoms
Correct answer is option 'A'. Can you explain this answer?
What is the term used for liquids that mix with each other?
a)
Miscible liquids
b)
Immiscible liquids
c)
Molecules
d)
Atoms
|
|
Tanishq Chavan answered |
The term used for liquids that mix with each other is "miscible liquids".
Explanation:
- When two or more liquids are able to mix and form a homogeneous mixture, they are said to be miscible.
- This means that the molecules of the two liquids are able to mix and spread evenly throughout the mixture.
- The ability of liquids to mix with each other depends on the attractive forces between their molecules.
- If the attractive forces between the molecules of two liquids are similar, then they are likely to be miscible.
- For example, water and ethanol are both polar molecules and have similar attractive forces, so they are miscible and can mix with each other in any proportion.
- On the other hand, oil and water are immiscible liquids because oil is non-polar and water is polar. The attractive forces between their molecules are not strong enough to allow them to mix.
- When two immiscible liquids are mixed together, they form separate layers, with one liquid floating on top of the other.
- It is important to note that the term miscible is used specifically for liquids, while the term soluble is used for solids that mix with each other in a liquid solvent.
- For example, sugar is soluble in water because the sugar molecules can mix with the water molecules and form a homogeneous mixture.
In summary, the term "miscible liquids" refers to liquids that are able to mix and form a homogeneous mixture due to similar attractive forces between their molecules.
Explanation:
- When two or more liquids are able to mix and form a homogeneous mixture, they are said to be miscible.
- This means that the molecules of the two liquids are able to mix and spread evenly throughout the mixture.
- The ability of liquids to mix with each other depends on the attractive forces between their molecules.
- If the attractive forces between the molecules of two liquids are similar, then they are likely to be miscible.
- For example, water and ethanol are both polar molecules and have similar attractive forces, so they are miscible and can mix with each other in any proportion.
- On the other hand, oil and water are immiscible liquids because oil is non-polar and water is polar. The attractive forces between their molecules are not strong enough to allow them to mix.
- When two immiscible liquids are mixed together, they form separate layers, with one liquid floating on top of the other.
- It is important to note that the term miscible is used specifically for liquids, while the term soluble is used for solids that mix with each other in a liquid solvent.
- For example, sugar is soluble in water because the sugar molecules can mix with the water molecules and form a homogeneous mixture.
In summary, the term "miscible liquids" refers to liquids that are able to mix and form a homogeneous mixture due to similar attractive forces between their molecules.
What happens to the intermolecular space between molecules when a substance is cooled?- a)It decreases
- b)It increases
- c)It remains constant
- d)It becomes zero
Correct answer is option 'A'. Can you explain this answer?
What happens to the intermolecular space between molecules when a substance is cooled?
a)
It decreases
b)
It increases
c)
It remains constant
d)
It becomes zero
|
Asha Sengupta answered |
The intermolecular space between molecules refers to the distance between the particles that make up a substance. When a substance is cooled, the kinetic energy of its particles decreases. This reduction in kinetic energy leads to changes in the intermolecular space. Let's explore this in more detail:
1. Explanation of intermolecular space:
- Intermolecular space refers to the space between molecules or particles in a substance.
- It is a result of the attractive forces between the particles, such as van der Waals forces, dipole-dipole interactions, or hydrogen bonding.
- The intermolecular space determines the physical properties of a substance, such as density, boiling point, and compressibility.
2. Effect of cooling on intermolecular space:
- Cooling a substance reduces the kinetic energy of its particles.
- As the particles lose kinetic energy, they slow down and move closer together.
- The attractive forces between the particles become more dominant as they approach each other.
- Consequently, the intermolecular space between molecules decreases.
3. Explanation of the correct option:
- The correct answer, option 'A' (It decreases), is supported by the explanation above.
- Cooling a substance reduces the intermolecular space because the particles move closer together due to decreased kinetic energy.
- This reduction in intermolecular space is observed in various substances when cooled, including gases, liquids, and solids.
4. Examples:
- In the case of a gas, cooling it can cause the particles to condense into a liquid or solid phase. This phase change is accompanied by a decrease in intermolecular space.
- For a liquid, cooling can lead to the formation of a solid as the particles arrange themselves in a more ordered manner, resulting in a decrease in intermolecular space.
- In a solid, cooling can cause the particles to vibrate less, leading to a decrease in intermolecular space between the fixed positions of the particles.
In summary, when a substance is cooled, the intermolecular space between molecules decreases. This is due to the reduction in kinetic energy of the particles, which causes them to move closer together and strengthen the attractive forces between them.
1. Explanation of intermolecular space:
- Intermolecular space refers to the space between molecules or particles in a substance.
- It is a result of the attractive forces between the particles, such as van der Waals forces, dipole-dipole interactions, or hydrogen bonding.
- The intermolecular space determines the physical properties of a substance, such as density, boiling point, and compressibility.
2. Effect of cooling on intermolecular space:
- Cooling a substance reduces the kinetic energy of its particles.
- As the particles lose kinetic energy, they slow down and move closer together.
- The attractive forces between the particles become more dominant as they approach each other.
- Consequently, the intermolecular space between molecules decreases.
3. Explanation of the correct option:
- The correct answer, option 'A' (It decreases), is supported by the explanation above.
- Cooling a substance reduces the intermolecular space because the particles move closer together due to decreased kinetic energy.
- This reduction in intermolecular space is observed in various substances when cooled, including gases, liquids, and solids.
4. Examples:
- In the case of a gas, cooling it can cause the particles to condense into a liquid or solid phase. This phase change is accompanied by a decrease in intermolecular space.
- For a liquid, cooling can lead to the formation of a solid as the particles arrange themselves in a more ordered manner, resulting in a decrease in intermolecular space.
- In a solid, cooling can cause the particles to vibrate less, leading to a decrease in intermolecular space between the fixed positions of the particles.
In summary, when a substance is cooled, the intermolecular space between molecules decreases. This is due to the reduction in kinetic energy of the particles, which causes them to move closer together and strengthen the attractive forces between them.
The state of matter which has a definite volume but no definite shape- a)Solid
- b)Liquid
- c)Gas
- d)Mixture
Correct answer is option 'B'. Can you explain this answer?
The state of matter which has a definite volume but no definite shape
a)
Solid
b)
Liquid
c)
Gas
d)
Mixture
|
|
Janhavi Bajaj answered |
The state of matter which has a definite volume but no definite shape is called as liquid.
Which is lighter than water?- a)Stone
- b)Diamond
- c)Steel
- d)Petrol
Correct answer is option 'D'. Can you explain this answer?
Which is lighter than water?
a)
Stone
b)
Diamond
c)
Steel
d)
Petrol
|
|
Manasa Datta answered |
Petrol is lighter than water as it floats on water surface when mixed with water.
The force of attraction between molecules is the strongest in- a)
- b)
- c)
- d)
Correct answer is option 'A'. Can you explain this answer?
The force of attraction between molecules is the strongest in
a)
b)
c)
d)
|
|
Harshad Goyal answered |
Figure A shows the strongest forces of attraction between the molecules of a solid.
Non-metal which is good conductor of electricity is- a)Graphite
- b)Diamond
- c)Sulpher
- d)Nitrogen
Correct answer is option 'A'. Can you explain this answer?
Non-metal which is good conductor of electricity is
a)
Graphite
b)
Diamond
c)
Sulpher
d)
Nitrogen
|
|
Kunal Mehta answered |
Graphite
It displays properties of both metals, and nonmetals. However, like a metal, graphite is a very good conductor of electricity due to the mobility of the electrons in its outer valence shells.
Which material property is crucial for distinguishing between wood and metals based on their appearance?- a)Hardness
- b)Malleability
- c)All of these
- d)Lustreous
Correct answer is option 'C'. Can you explain this answer?
Which material property is crucial for distinguishing between wood and metals based on their appearance?
a)
Hardness
b)
Malleability
c)
All of these
d)
Lustreous
|
|
Anastasia Orlova answered |
The crucial material property for distinguishing between wood and metal based on their appearance is **reflectivity** or **luster**.
1. **Reflectivity**: Metals generally have a higher reflectivity compared to wood. This means metals appear shinier and reflect light more uniformly, often resulting in a glossy or metallic sheen. In contrast, wood typically has a lower reflectivity, appearing more matte or with a subdued luster.
2. **Texture**: While not a material property per se, the texture of wood and metal can also be distinct. Wood often has a grainy texture that can be felt or seen, whereas metals are usually smoother or have a different surface texture depending on their finish (e.g., polished, brushed).
These visual characteristics are often the first indicators that allow us to differentiate between wood and metal based on their appearance alone.
1. **Reflectivity**: Metals generally have a higher reflectivity compared to wood. This means metals appear shinier and reflect light more uniformly, often resulting in a glossy or metallic sheen. In contrast, wood typically has a lower reflectivity, appearing more matte or with a subdued luster.
2. **Texture**: While not a material property per se, the texture of wood and metal can also be distinct. Wood often has a grainy texture that can be felt or seen, whereas metals are usually smoother or have a different surface texture depending on their finish (e.g., polished, brushed).
These visual characteristics are often the first indicators that allow us to differentiate between wood and metal based on their appearance alone.
Which of the following is NOT a state of matter?- a)Gas
- b)Liquid
- c)Solid
- d)Energy
Correct answer is option 'D'. Can you explain this answer?
Which of the following is NOT a state of matter?
a)
Gas
b)
Liquid
c)
Solid
d)
Energy
|
Anand thakur answered |
States of Matter
Matter is anything that has mass and takes up space. There are four states of matter - solids, liquids, gases, and plasma.
Solids
Solids have a definite shape and volume. The particles in a solid are tightly packed together and vibrate in place.
Liquids
Liquids have a definite volume but take the shape of their container. The particles in a liquid are close together but move around freely.
Gases
Gases have neither a definite shape nor volume. The particles in a gas are far apart and move around quickly.
Plasma
Plasma is a state of matter found in stars and lightning bolts. It is similar to a gas, but the particles are charged and can conduct electricity.
Answer
The correct answer is option 'D' - Energy. Energy is not a state of matter, but it is associated with matter and can cause changes in its state.
Matter is anything that has mass and takes up space. There are four states of matter - solids, liquids, gases, and plasma.
Solids
Solids have a definite shape and volume. The particles in a solid are tightly packed together and vibrate in place.
Liquids
Liquids have a definite volume but take the shape of their container. The particles in a liquid are close together but move around freely.
Gases
Gases have neither a definite shape nor volume. The particles in a gas are far apart and move around quickly.
Plasma
Plasma is a state of matter found in stars and lightning bolts. It is similar to a gas, but the particles are charged and can conduct electricity.
Answer
The correct answer is option 'D' - Energy. Energy is not a state of matter, but it is associated with matter and can cause changes in its state.
Properties of metal due to which it can be beaten into thin sheet is called
- a)Magnetic
- b)Ductility
- c)Solubility
- d)Malleability
Correct answer is option 'D'. Can you explain this answer?
Properties of metal due to which it can be beaten into thin sheet is called
a)
Magnetic
b)
Ductility
c)
Solubility
d)
Malleability
|
Swara Mukherjee answered |
The properties of metal due to which metal can be beaten into thin sheet is called as malleability. Gold is most malleable metal.
Which process involves changing a liquid into a gas on heating?- a)Melting
- b)Condensation
- c)Freezing
- d)Evaporation
Correct answer is option 'D'. Can you explain this answer?
Which process involves changing a liquid into a gas on heating?
a)
Melting
b)
Condensation
c)
Freezing
d)
Evaporation
|
|
Aditya Shah answered |
Evaporation is the process of changing a liquid into a gas on heating.
Which of the following can dissolve in water?- a)Atoms
- b)Energy
- c)Molecules
- d)Elements
Correct answer is option 'C'. Can you explain this answer?
Which of the following can dissolve in water?
a)
Atoms
b)
Energy
c)
Molecules
d)
Elements
|
|
Jay Rane answered |
Dissolving in Water
When a substance dissolves in water, it means that it breaks down into smaller particles and mixes evenly with water molecules. Some substances can dissolve in water while others cannot. Let's take a look at the options given in the question and see which one can dissolve in water.
Atoms
Atoms are the smallest unit of matter that cannot be broken down any further. They are the building blocks of all matter. However, atoms cannot dissolve in water as they are too small and do not have a charge.
Energy
Energy is not a substance but a property of matter. It cannot dissolve in water as it is not a physical object.
Molecules
Molecules are made up of two or more atoms that are chemically bonded together. Some molecules can dissolve in water while others cannot. The ability of a molecule to dissolve in water depends on its polarity. Polar molecules have a positive and negative end and can dissolve in water, while non-polar molecules cannot. Examples of polar molecules that can dissolve in water include sugar and salt.
Elements
Elements are substances made up of only one type of atom. Like atoms, they cannot dissolve in water as they are too small and do not have a charge.
Conclusion
Out of the given options, only molecules can dissolve in water. However, it is important to note that not all molecules can dissolve in water. The ability of a molecule to dissolve in water depends on its polarity.
When a substance dissolves in water, it means that it breaks down into smaller particles and mixes evenly with water molecules. Some substances can dissolve in water while others cannot. Let's take a look at the options given in the question and see which one can dissolve in water.
Atoms
Atoms are the smallest unit of matter that cannot be broken down any further. They are the building blocks of all matter. However, atoms cannot dissolve in water as they are too small and do not have a charge.
Energy
Energy is not a substance but a property of matter. It cannot dissolve in water as it is not a physical object.
Molecules
Molecules are made up of two or more atoms that are chemically bonded together. Some molecules can dissolve in water while others cannot. The ability of a molecule to dissolve in water depends on its polarity. Polar molecules have a positive and negative end and can dissolve in water, while non-polar molecules cannot. Examples of polar molecules that can dissolve in water include sugar and salt.
Elements
Elements are substances made up of only one type of atom. Like atoms, they cannot dissolve in water as they are too small and do not have a charge.
Conclusion
Out of the given options, only molecules can dissolve in water. However, it is important to note that not all molecules can dissolve in water. The ability of a molecule to dissolve in water depends on its polarity.
Which is a magnetic material?- a)Copper
- b)Iron
- c)Aluminium
- d)Silver
Correct answer is option 'B'. Can you explain this answer?
Which is a magnetic material?
a)
Copper
b)
Iron
c)
Aluminium
d)
Silver
|
|
Ameya Ahuja answered |
Those substances that are attracted by magnet are called magnetic material. Iron is a magnetic material.
Which object shines?- a)Plastic toy
- b)Cotton shirt
- c)Steel spoon
- d)Stone piece
Correct answer is option 'C'. Can you explain this answer?
Which object shines?
a)
Plastic toy
b)
Cotton shirt
c)
Steel spoon
d)
Stone piece
|
|
Maya Deshpande answered |
Shining Object:
Plastic toy
Cotton shirt
Steel spoon
Stone piece
Explanation:
Steel Spoon:
- Steel is a material known for its luster and reflective properties.
- When polished, steel has a shiny appearance that reflects light.
- Due to its smooth surface, steel can easily shine and appear bright.
- Therefore, out of the given options, the steel spoon is the object that shines.
Plastic toy
Cotton shirt
Steel spoon
Stone piece
Explanation:
Steel Spoon:
- Steel is a material known for its luster and reflective properties.
- When polished, steel has a shiny appearance that reflects light.
- Due to its smooth surface, steel can easily shine and appear bright.
- Therefore, out of the given options, the steel spoon is the object that shines.
Matter can be defined as something that- a)Occupies space
- b)Has mass
- c)Exists in three states
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
Matter can be defined as something that
a)
Occupies space
b)
Has mass
c)
Exists in three states
d)
All of the above
|
|
Asha Sengupta answered |
Matter is defined as something that which occupies space and possesses rest mass, especially as distinct from energy and exists in all the three states.
Can you explain the answer of this question below:Making orderly arrangement of materials is called
- A:
Grouping
- B:
Dividing
- C:
Classification
- D:
Division
The answer is C.
Making orderly arrangement of materials is called
Grouping
Dividing
Classification
Division
|
|
Rajeev Sen answered |
The sorting of objects into groups with each group having its own characteristic properties is called classification of objects. All the objects having similar characteristics properties are placed in one group different groups. And the objects having different properties are placed in different groups.
1. The classification of objects into groups makes it easier to locate them and work with them.
2. If we know the properties of any one member of the group, we can get an idea of the properties of the other members of this group.
What is a distinguishing visual feature that sets wood apart from metals like iron, copper, and aluminum?- a)Conductivity
- b)Brittleness
- c)Natural Color and Grain Pattern
- d)High Density
Correct answer is option 'C'. Can you explain this answer?
What is a distinguishing visual feature that sets wood apart from metals like iron, copper, and aluminum?
a)
Conductivity
b)
Brittleness
c)
Natural Color and Grain Pattern
d)
High Density
|
Coachify answered |
One of the key visual features that differentiate wood from metals like iron, copper, and aluminum is its natural color and grain pattern. Wood materials exhibit a variety of colors and unique grain patterns that are specific to different types of wood species. This characteristic makes wood visually distinct from metals, which have more uniform and metallic appearances, often characterized by reflective surfaces and specific metallic hues.
Metallic object loose their lustre due to- a)Corrosion
- b)Melting
- c)Wetting
- d)Oiling
Correct answer is option 'A'. Can you explain this answer?
Metallic object loose their lustre due to
a)
Corrosion
b)
Melting
c)
Wetting
d)
Oiling
|
|
Shilpa nair answered |
The action of air, water on metal surface is called as corrosion. Due to corrosion metallic objects lose their lustre
Which of the following materials is classified as translucent?- a)Butter Paper
- b)Wood
- c)Metal
- d)Plastic
Correct answer is option 'A'. Can you explain this answer?
Which of the following materials is classified as translucent?
a)
Butter Paper
b)
Wood
c)
Metal
d)
Plastic
|
|
Maya Deshpande answered |
Translucent Material: Butter Paper
Translucent materials allow some light to pass through, but they scatter the light in different directions. One example of a translucent material is butter paper.
Explanation:
Butter Paper:
- Butter paper is a type of translucent material that allows light to pass through, but it diffuses or scatters the light.
- When light passes through butter paper, objects on the other side can still be seen, but the details may be blurred or softened.
- This property of allowing light to pass through partially makes butter paper useful for various applications such as wrapping food items or protecting surfaces while painting.
- Unlike transparent materials that allow light to pass through without scattering, translucent materials like butter paper scatter light to some extent, creating a semi-opaque effect.
Other Options:
- Wood, metal, and plastic are not classified as translucent materials. Wood and metal are typically opaque, meaning they do not allow light to pass through, while plastic can be transparent or opaque depending on its composition.
In conclusion, butter paper is classified as a translucent material because it allows light to pass through while scattering it in different directions, making it ideal for various practical uses.
Translucent materials allow some light to pass through, but they scatter the light in different directions. One example of a translucent material is butter paper.
Explanation:
Butter Paper:
- Butter paper is a type of translucent material that allows light to pass through, but it diffuses or scatters the light.
- When light passes through butter paper, objects on the other side can still be seen, but the details may be blurred or softened.
- This property of allowing light to pass through partially makes butter paper useful for various applications such as wrapping food items or protecting surfaces while painting.
- Unlike transparent materials that allow light to pass through without scattering, translucent materials like butter paper scatter light to some extent, creating a semi-opaque effect.
Other Options:
- Wood, metal, and plastic are not classified as translucent materials. Wood and metal are typically opaque, meaning they do not allow light to pass through, while plastic can be transparent or opaque depending on its composition.
In conclusion, butter paper is classified as a translucent material because it allows light to pass through while scattering it in different directions, making it ideal for various practical uses.
Why is grouping materials important?- a)To make objects look pretty
- b)To locate and study their properties
- c)To play with different materials
- d)To hide materials from others
Correct answer is option 'B'. Can you explain this answer?
Why is grouping materials important?
a)
To make objects look pretty
b)
To locate and study their properties
c)
To play with different materials
d)
To hide materials from others
|
Nclex Coaching Centre answered |
- Grouping materials is important because it helps us find and study their properties easily.
- When we group materials based on their similarities and differences, we can understand how they look, feel, and behave.
- For example, grouping all the soft materials together can help us learn about materials that are soft to touch, like cotton or sponge.
- So, by grouping materials, we can learn a lot about them and how they can be used to make different things.
Which of the following pairs correctly matches a soft material with a corresponding example?
- a)Cotton - Iron
- b)Sponge - Cotton
- c)Wood - Plastic
- d)Nails - Aluminum
Correct answer is option 'B'. Can you explain this answer?
Which of the following pairs correctly matches a soft material with a corresponding example?
a)
Cotton - Iron
b)
Sponge - Cotton
c)
Wood - Plastic
d)
Nails - Aluminum
|
|
Rounak Chawla answered |
Explanation:
Sponge - Glass:
- A sponge is a soft material that is porous and can easily absorb liquids.
- Glass is a hard material that is transparent and brittle.
- The pair matches correctly because sponge and glass are examples of materials with significantly different hardness levels.
Cotton - Iron:
- Cotton is a soft, natural fiber commonly used in textiles and clothing.
- Iron is a hard metal known for its strength and durability.
- This pair does not match correctly as cotton and iron have different material properties.
Wood - Plastic:
- Wood is a natural material derived from trees, known for its versatility and strength.
- Plastic is a synthetic material that can be molded into various shapes and forms.
- While both materials have different properties, they are not classified as soft or hard materials in this context.
Nails - Aluminum:
- Nails are hard, metal fasteners used for joining materials together.
- Aluminum is a lightweight metal known for its strength and corrosion resistance.
- This pair does not match correctly as nails and aluminum are both hard materials.
In conclusion, the correct pair that matches a soft material with a corresponding example is Sponge - Glass.
Sponge - Glass:
- A sponge is a soft material that is porous and can easily absorb liquids.
- Glass is a hard material that is transparent and brittle.
- The pair matches correctly because sponge and glass are examples of materials with significantly different hardness levels.
Cotton - Iron:
- Cotton is a soft, natural fiber commonly used in textiles and clothing.
- Iron is a hard metal known for its strength and durability.
- This pair does not match correctly as cotton and iron have different material properties.
Wood - Plastic:
- Wood is a natural material derived from trees, known for its versatility and strength.
- Plastic is a synthetic material that can be molded into various shapes and forms.
- While both materials have different properties, they are not classified as soft or hard materials in this context.
Nails - Aluminum:
- Nails are hard, metal fasteners used for joining materials together.
- Aluminum is a lightweight metal known for its strength and corrosion resistance.
- This pair does not match correctly as nails and aluminum are both hard materials.
In conclusion, the correct pair that matches a soft material with a corresponding example is Sponge - Glass.
Which of the following is a physical change?
- a)Rusting of iron
- b)Cooking of food
- c)Burning of paper
- d)Converting ice into water
Correct answer is option 'D'. Can you explain this answer?
Which of the following is a physical change?
a)
Rusting of iron
b)
Cooking of food
c)
Burning of paper
d)
Converting ice into water
|
|
Chirag Datta answered |
Converting ice to water: There is no change in the chemical composition of water. The process is reversible and ice can be obtained back by freezing. Thus it is clear that it is a physical change.
Substances that can burn easily are called- a)Combustible substance
- b)Permeable substance
- c)Non-combustible substance
- d)Impermeable substance
Correct answer is option 'A'. Can you explain this answer?
Substances that can burn easily are called
a)
Combustible substance
b)
Permeable substance
c)
Non-combustible substance
d)
Impermeable substance
|
|
Divyansh Gupta answered |
The substances that can burn easily are called as combustible substance such as coal , petrol, wood etc.
What is the process called when a liquid turns into a solid?
- a)Freezing
- b)Melting
- c)Boiling
- d)Evaporation
Correct answer is option 'A'. Can you explain this answer?
What is the process called when a liquid turns into a solid?
a)
Freezing
b)
Melting
c)
Boiling
d)
Evaporation
|
Soumya Patel answered |
The force of attraction between molecules in solids is strong. This is due to the arrangement and bonding of the atoms within the solid structure.
1. Intermolecular Forces:
In solids, the intermolecular forces are the forces of attraction between molecules. These forces can be categorized into three main types: London dispersion forces, dipole-dipole forces, and hydrogen bonding. These forces act between the molecules and hold them together.
2. London Dispersion Forces:
London dispersion forces are the weakest type of intermolecular force. They occur due to temporary fluctuations in electron distribution, which create temporary dipoles in the molecules. These temporary dipoles induce similar dipoles in neighboring molecules, resulting in attractive forces between them. While London dispersion forces are relatively weak, they still contribute to the overall force of attraction between molecules in solids.
3. Dipole-Dipole Forces:
Dipole-dipole forces occur between polar molecules. These forces arise due to the attraction between the positive end of one molecule and the negative end of another molecule. The strength of dipole-dipole forces depends on the magnitude of the molecular dipole moment. In solids composed of polar molecules, the dipole-dipole forces contribute to the strong force of attraction between the molecules.
4. Hydrogen Bonding:
Hydrogen bonding is a special type of dipole-dipole interaction that occurs between a hydrogen atom bonded to a highly electronegative atom (such as oxygen, nitrogen, or fluorine) and another electronegative atom in a different molecule. Hydrogen bonding is stronger than regular dipole-dipole forces and contributes significantly to the force of attraction between molecules in solids, especially in substances like water and ammonia.
5. Overall Strong Force of Attraction:
In solids, the combination of London dispersion forces, dipole-dipole forces, and hydrogen bonding results in a strong force of attraction between molecules. This strong force is responsible for the rigidity and stability of solid materials.
In conclusion, the force of attraction between molecules in solids is strong. The intermolecular forces, including London dispersion forces, dipole-dipole forces, and hydrogen bonding, contribute to this strong force of attraction.
1. Intermolecular Forces:
In solids, the intermolecular forces are the forces of attraction between molecules. These forces can be categorized into three main types: London dispersion forces, dipole-dipole forces, and hydrogen bonding. These forces act between the molecules and hold them together.
2. London Dispersion Forces:
London dispersion forces are the weakest type of intermolecular force. They occur due to temporary fluctuations in electron distribution, which create temporary dipoles in the molecules. These temporary dipoles induce similar dipoles in neighboring molecules, resulting in attractive forces between them. While London dispersion forces are relatively weak, they still contribute to the overall force of attraction between molecules in solids.
3. Dipole-Dipole Forces:
Dipole-dipole forces occur between polar molecules. These forces arise due to the attraction between the positive end of one molecule and the negative end of another molecule. The strength of dipole-dipole forces depends on the magnitude of the molecular dipole moment. In solids composed of polar molecules, the dipole-dipole forces contribute to the strong force of attraction between the molecules.
4. Hydrogen Bonding:
Hydrogen bonding is a special type of dipole-dipole interaction that occurs between a hydrogen atom bonded to a highly electronegative atom (such as oxygen, nitrogen, or fluorine) and another electronegative atom in a different molecule. Hydrogen bonding is stronger than regular dipole-dipole forces and contributes significantly to the force of attraction between molecules in solids, especially in substances like water and ammonia.
5. Overall Strong Force of Attraction:
In solids, the combination of London dispersion forces, dipole-dipole forces, and hydrogen bonding results in a strong force of attraction between molecules. This strong force is responsible for the rigidity and stability of solid materials.
In conclusion, the force of attraction between molecules in solids is strong. The intermolecular forces, including London dispersion forces, dipole-dipole forces, and hydrogen bonding, contribute to this strong force of attraction.
Which of the following is a chemical change?- a)Melting of ice
- b)Boiling of water
- c)Burning of wood
- d)Chopping of vegetables
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a chemical change?
a)
Melting of ice
b)
Boiling of water
c)
Burning of wood
d)
Chopping of vegetables
|
Kavya Chauhan answered |
Melting of ice:
When ice melts, it undergoes a physical change, not a chemical change. The molecules in the ice are rearranged, but the chemical composition remains the same. The process of melting ice is a phase change from a solid to a liquid state.
Boiling of water:
Similar to the melting of ice, boiling water is also a physical change. The heat energy causes the water molecules to gain enough kinetic energy to break the intermolecular forces and convert from a liquid to a gas state. The chemical composition of water remains unchanged during this process.
Burning of wood:
The burning of wood is a chemical change. When wood burns, it undergoes a process called combustion. The heat energy breaks down the complex organic compounds present in wood, such as cellulose and lignin, into simpler substances like carbon dioxide, water vapor, and ash. This chemical reaction involves the rearrangement of atoms and the formation of new chemical bonds, resulting in a change in the chemical composition of the wood.
Chopping of vegetables:
Chopping vegetables is a physical change. It involves cutting the vegetables into smaller pieces, but the chemical composition of the vegetables remains the same. The process of chopping does not involve any chemical reactions.
Conclusion:
Among the given options, the burning of wood (Option C) is the only example of a chemical change. It involves a combustion reaction that results in the formation of new substances with different chemical properties. The other options, melting of ice, boiling of water, and chopping of vegetables, are all examples of physical changes where the chemical composition remains unchanged.
When ice melts, it undergoes a physical change, not a chemical change. The molecules in the ice are rearranged, but the chemical composition remains the same. The process of melting ice is a phase change from a solid to a liquid state.
Boiling of water:
Similar to the melting of ice, boiling water is also a physical change. The heat energy causes the water molecules to gain enough kinetic energy to break the intermolecular forces and convert from a liquid to a gas state. The chemical composition of water remains unchanged during this process.
Burning of wood:
The burning of wood is a chemical change. When wood burns, it undergoes a process called combustion. The heat energy breaks down the complex organic compounds present in wood, such as cellulose and lignin, into simpler substances like carbon dioxide, water vapor, and ash. This chemical reaction involves the rearrangement of atoms and the formation of new chemical bonds, resulting in a change in the chemical composition of the wood.
Chopping of vegetables:
Chopping vegetables is a physical change. It involves cutting the vegetables into smaller pieces, but the chemical composition of the vegetables remains the same. The process of chopping does not involve any chemical reactions.
Conclusion:
Among the given options, the burning of wood (Option C) is the only example of a chemical change. It involves a combustion reaction that results in the formation of new substances with different chemical properties. The other options, melting of ice, boiling of water, and chopping of vegetables, are all examples of physical changes where the chemical composition remains unchanged.
Matter is made up tiny particles called- a)Atoms.
- b)Molecules.
- c)Cells.
- d)Ions.
Correct answer is option 'A'. Can you explain this answer?
Matter is made up tiny particles called
a)
Atoms.
b)
Molecules.
c)
Cells.
d)
Ions.
|
|
Rounak Patel answered |
Matter is made up of tiny particles called atoms.
What happens to electric wires between electric poles in the summer season?- a)They become loose
- b)They become tight
- c)They remain the same
- d)They break
Correct answer is option 'A'. Can you explain this answer?
What happens to electric wires between electric poles in the summer season?
a)
They become loose
b)
They become tight
c)
They remain the same
d)
They break
|
|
Maulik Chauhan answered |
Explanation:
In the summer season, electric wires between electric poles can become loose. This can happen due to a few reasons:
1. Expansion and contraction of materials:
- In the summer season, temperatures can rise significantly, causing materials, including metal wires, to expand.
- When the wires expand, they may become longer and may not fit as tightly between the electric poles as they did during cooler seasons.
- This expansion can create slack in the wires, making them loose.
2. Thermal expansion of the poles:
- Electric poles are often made of materials such as wood or metal.
- These materials also expand when exposed to high temperatures.
- As the poles expand, they may move slightly, causing the wires connected to them to become loose.
3. Natural factors:
- Wind and storms are common during the summer season.
- Strong winds can cause the wires to sway and move, leading to them becoming loose.
- Additionally, lightning strikes during storms can cause damage to the wires, resulting in them becoming loose or even breaking.
Consequences of loose electric wires:
1. Safety hazards:
- Loose electric wires pose a significant safety risk.
- They can sag and come into contact with trees, buildings, or the ground, increasing the chances of electrical accidents.
- People or animals may accidentally touch the live wires, leading to electric shocks or even electrocution.
2. Disruption of electricity supply:
- Loose wires can cause disruptions in the electricity supply.
- If the wires become too loose, they may detach from the electric poles, leading to power outages in the affected area.
Preventive measures:
To prevent electric wires from becoming loose during the summer season, regular maintenance and inspections are necessary. This includes:
- Tightening the wires and ensuring they are securely fastened to the electric poles.
- Checking for any signs of wear or damage and repairing or replacing the wires as needed.
- Trimming tree branches near the wires to prevent them from coming into contact during windy conditions.
- Regularly inspecting the poles for any signs of damage or instability.
By taking these preventive measures and addressing any issues promptly, the risks associated with loose electric wires can be minimized, ensuring a safe and reliable supply of electricity.
In the summer season, electric wires between electric poles can become loose. This can happen due to a few reasons:
1. Expansion and contraction of materials:
- In the summer season, temperatures can rise significantly, causing materials, including metal wires, to expand.
- When the wires expand, they may become longer and may not fit as tightly between the electric poles as they did during cooler seasons.
- This expansion can create slack in the wires, making them loose.
2. Thermal expansion of the poles:
- Electric poles are often made of materials such as wood or metal.
- These materials also expand when exposed to high temperatures.
- As the poles expand, they may move slightly, causing the wires connected to them to become loose.
3. Natural factors:
- Wind and storms are common during the summer season.
- Strong winds can cause the wires to sway and move, leading to them becoming loose.
- Additionally, lightning strikes during storms can cause damage to the wires, resulting in them becoming loose or even breaking.
Consequences of loose electric wires:
1. Safety hazards:
- Loose electric wires pose a significant safety risk.
- They can sag and come into contact with trees, buildings, or the ground, increasing the chances of electrical accidents.
- People or animals may accidentally touch the live wires, leading to electric shocks or even electrocution.
2. Disruption of electricity supply:
- Loose wires can cause disruptions in the electricity supply.
- If the wires become too loose, they may detach from the electric poles, leading to power outages in the affected area.
Preventive measures:
To prevent electric wires from becoming loose during the summer season, regular maintenance and inspections are necessary. This includes:
- Tightening the wires and ensuring they are securely fastened to the electric poles.
- Checking for any signs of wear or damage and repairing or replacing the wires as needed.
- Trimming tree branches near the wires to prevent them from coming into contact during windy conditions.
- Regularly inspecting the poles for any signs of damage or instability.
By taking these preventive measures and addressing any issues promptly, the risks associated with loose electric wires can be minimized, ensuring a safe and reliable supply of electricity.
Which of the following has a definite shape and volume?- a)Gas
- b)Liquid
- c)Solid
- d)Plasma
Correct answer is option 'C'. Can you explain this answer?
Which of the following has a definite shape and volume?
a)
Gas
b)
Liquid
c)
Solid
d)
Plasma
|
|
Edu Impact answered |
Solids have a definite shape and volume. Hence, option C is the right option.
What property of materials do we observe by looking through a sheet of paper with and without oil?- a)Color
- b)Transparency
- c)Hardness
- d)Shape
Correct answer is option 'B'. Can you explain this answer?
What property of materials do we observe by looking through a sheet of paper with and without oil?
a)
Color
b)
Transparency
c)
Hardness
d)
Shape
|
Preethi Shah answered |
Transparency of Materials:
Transparency is the property of materials that allows light to pass through them. When we look through a sheet of paper without any oil on it, we can see through it partially, but it is not completely transparent. However, when we add oil to the paper and look through it again, we notice that the paper becomes more transparent than before.
Explanation:
- Transparency: Transparency refers to the ability of a material to allow light to pass through it. Materials that are transparent allow light to pass through clearly, while materials that are opaque do not allow light to pass through at all.
- Effect of Oil: When we add oil to a sheet of paper, it fills in the gaps between the fibers of the paper, making it smoother and more uniform. This reduces the scattering of light as it passes through the paper, making it appear more transparent.
- Observation: By looking through the sheet of paper with and without oil, we can observe how the transparency of the paper changes. The sheet of paper without oil will be less transparent compared to the sheet of paper with oil.
- Conclusion: The presence of oil on the paper affects its transparency by allowing more light to pass through it. This experiment demonstrates the importance of material properties, such as transparency, in understanding how materials interact with light.
Transparency is the property of materials that allows light to pass through them. When we look through a sheet of paper without any oil on it, we can see through it partially, but it is not completely transparent. However, when we add oil to the paper and look through it again, we notice that the paper becomes more transparent than before.
Explanation:
- Transparency: Transparency refers to the ability of a material to allow light to pass through it. Materials that are transparent allow light to pass through clearly, while materials that are opaque do not allow light to pass through at all.
- Effect of Oil: When we add oil to a sheet of paper, it fills in the gaps between the fibers of the paper, making it smoother and more uniform. This reduces the scattering of light as it passes through the paper, making it appear more transparent.
- Observation: By looking through the sheet of paper with and without oil, we can observe how the transparency of the paper changes. The sheet of paper without oil will be less transparent compared to the sheet of paper with oil.
- Conclusion: The presence of oil on the paper affects its transparency by allowing more light to pass through it. This experiment demonstrates the importance of material properties, such as transparency, in understanding how materials interact with light.
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