Class 8 Exam > Class 8 Notes > Science Curiosity Class 8 - New NCERT > Unit Test: Pressure, Winds, Storms, and Cyclones
Unit Test: Pressure, Winds, Storms, and Cyclones | Science Curiosity Class 8 - New NCERT PDF Download
Time: 1 hour
M.M. 30
Attempt all questions.
- Question numbers 1 to 5 carry 1 mark each.
- Question numbers 6 to 8 carry 2 marks each.
- Question numbers 9 to 11 carry 3 marks each.
- Question number 12 & 13 carry 5 marks each.
- 1-mark questions include MCQs.
Q1: Pressure is defined as (1 Mark)
(i) force × area
(ii) force ÷ area
(iii) area ÷ force
(iv) mass × acceleration
Pressure depends on Force and Area
Q2: The SI unit of pressure is (1 Mark)
(i) N
(ii) m2
(iii) N/m2 (pascal)
(iv) kg
Q3: Liquids exert pressure (1 Mark)
(i) only at the bottom of the container
(ii) only at the surface
(iii) on the bottom and the walls, in all directions
(iv) not at all
Q4: Air moves from a region of (1 Mark)
(i) lower pressure to higher pressure
(ii) higher pressure to lower pressure
(iii) equal pressure to equal pressure
(iv) calm to windy region
Q5: High-speed winds are accompanied by (1 Mark)
(i) higher pressure
(ii) lower pressure
(iii) no pressure change
(iv) only temperature change
Q6: Why are overhead water tanks placed at a height? (2 Marks)
Overhead Tanks placed at heightQ7: Two vertical pipes of different diameters are connected to identical balloons at the bottom and filled to the same water height. Both balloons bulge equally. Explain. (2 Marks)
Q8: A rubber sucker sticks to a smooth tile but not to a rough wall. Why? (2 Marks)
Q9: State two observations/activities that show air exerts pressure in all directions. (3 Marks)
Q10: Describe how high-speed winds can blow off roofs and a safety measure to reduce this risk. (3 Marks)
Q11: Differentiate between a thunderstorm and a cyclone on the basis of formation and scale. (3 Marks)
Q12: (a) Explain with examples how “pressure = force/area” guides tool design and load carrying.
(b) A 225 N force acts uniformly on a 0.015 m2 area. Compute the pressure.
(c) In below figure (communicating vessels), water is poured into vessel R connected to P and Q; once flow stops, which vessel shows the highest level? Justify. (5 Marks)
Q13: (a) Describe the sequence from warm, moist air near the surface to a thunderstorm with lightning.
(b) How can a storm intensify into a cyclone over the ocean?
(c) List three cyclone safety actions for coastal communities. (5 Marks)
The document Unit Test: Pressure, Winds, Storms, and Cyclones | Science Curiosity Class 8 - New NCERT is a part of the Class 8 Course Science Curiosity Class 8 - New NCERT.
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FAQs on Unit Test: Pressure, Winds, Storms, and Cyclones - Science Curiosity Class 8 - New NCERT
| 1. What is the relationship between atmospheric pressure and weather patterns? |  |
Ans. Atmospheric pressure is a crucial factor in determining weather patterns. High pressure generally leads to clear skies and stable weather, while low pressure is associated with cloudy skies and storms. Changes in pressure can cause winds to form as air moves from high to low-pressure areas, influencing weather conditions and storm development.
| 2. How do winds affect the formation of storms and cyclones? | |
Ans. Winds play a vital role in the formation of storms and cyclones. They help to transport moisture from oceans and other bodies of water, which can lead to increased cloud formation and precipitation. When winds converge at a low-pressure area, they can cause the air to rise and cool, resulting in storm systems. In tropical regions, this process can lead to the development of cyclones, which are powerful storms characterized by strong winds and heavy rainfall.
| 3. What are the main types of storms, and how are they classified? | |
Ans. The main types of storms include thunderstorms, hurricanes, tornadoes, and winter storms. They are classified based on their characteristics, such as wind speed, duration, and the conditions under which they form. For instance, thunderstorms can produce heavy rain and lightning, while hurricanes are categorized by their wind speeds, with categories ranging from 1 (weakest) to 5 (strongest) based on the Saffir-Simpson scale.
| 4. What are cyclones, and how do they differ from other types of storms? | |
Ans. Cyclones are large-scale air masses that rotate around a center of low atmospheric pressure. They differ from other types of storms in terms of their size, structure, and intensity. Cyclones typically have a well-defined center or eye, surrounded by a wall of clouds and thunderstorms. Unlike smaller storms, cyclones can last for several days or even weeks and can cause significant damage due to their strong winds and heavy rainfall.
| 5. What safety measures should be taken during a cyclone warning? | |
Ans. During a cyclone warning, it is essential to take several safety measures to protect life and property. These include staying informed through reliable weather updates, securing loose objects outside, moving to a safe shelter away from windows, and having an emergency kit ready with essentials like food, water, and medical supplies. Additionally, it is important to follow evacuation orders if issued by local authorities to ensure safety during severe weather events.
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Sep 04, 2025
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