Class 5 Exam > Class 5 Notes > Our Wondrous World Class 5 - New NCERT > Unit Test (Solutions): Energy — How Things Work
Unit Test (Solutions): Energy — How Things Work | Our Wondrous World Class 5 - New NCERT PDF Download
Time: 45 Minutes
M.M.: 20
Attempt all questions.
Question numbers 1 to 6 carry 1 mark each.
Question numbers 7 to 9 carry 3 marks each.
Question number 10 carries 5 marks.
Q1. Which is a clean source of energy?
(a) Coal
(b) Diesel
(c) Solar energy
(d) Kerosene
Ans: (c) Solar energy
Q2. Fill in the blanks:
Energy makes things ______, produce ______, give ______, and change temperature.
Ans: move, sound, light
Q3. True or False:
Wind can make a pinwheel rotate, and water can turn a water wheel.
Ans: True
Q4. Which fuel commonly used at home for cooking is cleaner than coal or wood?
Ans: LPG (cooking gas)
Q5. Match the following:
Ans:
Q6. Which airport is known for being entirely powered by solar energy?
(a) Mumbai
(b) Delhi
(c) Cochin
(d) Chennai
Ans: (c) Cochin
Q7. Give three examples from daily life where electricity is used for different purposes.
Ans: 1. Bulb/tube light for light.
2. Fan for movement/air circulation.
3. Heater/iron for heat.
Q8. Why is energy efficiency important? List three actions to save energy at home/school.
Ans: 1. Saves resources and reduces pollution.
2. Use LED bulbs, turn off devices when not in use.
3. Use natural light/ventilation instead of lights/AC.
Q9. Give three reasons why wind, solar, and water are called clean sources of energy.
Ans: 1. Produce electricity without smoke.
2. Reduce greenhouse gas emissions.
3. Use naturally replenished resources.
Q10. Draw a simple “Energy Flow” for any one device and explain:
(a) Source of energy,
(b) Type of energy used/converted,
(c) Useful output.
Ans:
Solar lamp(a) Source: Sunlight captured by solar panel.
(b) Conversion: Light energy to electrical energy stored in a battery.
(c) Output: Light for studying at night.
(Other valid examples: Water wheel → movement to mechanical work; Windmill → movement to electricity.)
The document Unit Test (Solutions): Energy — How Things Work | Our Wondrous World Class 5 - New NCERT is a part of the Class 5 Course Our Wondrous World Class 5 - New NCERT.
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FAQs on Unit Test (Solutions): Energy — How Things Work - Our Wondrous World Class 5 - New NCERT
| 1. What is energy and why is it important in our daily lives? |  |
Ans.Energy is the ability to do work or cause change. It is fundamental to all physical processes and is essential for our daily activities, such as moving, heating, and powering devices. Without energy, life as we know it would not be possible, as all living organisms rely on energy to grow, reproduce, and function.
| 2. What are the different forms of energy? | |
Ans.Energy exists in various forms, including kinetic energy (energy of motion), potential energy (stored energy based on position), thermal energy (heat), chemical energy (stored in chemical bonds), electrical energy (flow of electric charge), and nuclear energy (stored in atomic nuclei). Understanding these forms helps us harness energy effectively.
| 3. How is energy transformed from one form to another? | |
Ans.Energy transformation occurs when energy changes from one form to another. For example, in a light bulb, electrical energy is transformed into light and thermal energy. Similarly, when we eat food, the chemical energy in the food is converted into kinetic energy for movement and thermal energy to maintain body temperature.
| 4. Can energy be created or destroyed? | |
Ans.According to the law of conservation of energy, energy cannot be created or destroyed; it can only be transformed from one form to another. This means that the total amount of energy in a closed system remains constant, although it may change forms, such as from potential energy to kinetic energy.
| 5. How do we measure energy? | |
Ans.Energy is measured in various units, with the most common being joules (J). Other units include calories (commonly used in food energy) and kilowatt-hours (used for electrical energy). Measuring energy helps us understand consumption patterns and efficiency in various applications, from household appliances to industrial processes.
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Sep 06, 2025
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