Pressure, Winds, Storms, and Cyclones
CBSE · Class 8 · Science
Flashcards for Pressure, Winds, Storms, and Cyclones — CBSE Class 8 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is pressure? Give its SI unit.
Answer
Pressure is the force acting per unit area on a surface. It is calculated as Pressure = Force ÷ Area. The SI unit of pressure is Newton per square metre (N/m²), also called Pascal (Pa).
Why do we feel more comfortable carrying a bag with broad straps than narrow straps?
Answer
Broad straps distribute the weight of the bag over a larger area of our shoulders, reducing the pressure. Since pressure = force/area, when area increases, pressure decreases, making it more comfortab…
Calculate the pressure when a force of 200 N acts on an area of 4 m².
Answer
Pressure = Force ÷ Area = 200 N ÷ 4 m² = 50 N/m² or 50 Pa…
Why are water tanks placed at height?
Answer
Water tanks are placed at height because the pressure exerted by a liquid depends on the height of its column. Greater height creates higher pressure, ensuring a good stream of water from taps at lowe…
Do liquids exert pressure only at the bottom of a container?
Answer
No, liquids exert pressure in all directions - at the bottom, on the sides, and even upward. This is why water spurts out from holes made in the sides of a container.
What is atmospheric pressure?
Answer
Atmospheric pressure is the pressure exerted by the air around us. It is caused by the weight of the entire atmosphere pressing down on Earth's surface. At sea level, it is approximately 101,300 Pa.
Why are we not crushed by atmospheric pressure?
Answer
We are not crushed by atmospheric pressure because the pressure inside our bodies equals the atmospheric pressure outside. This internal pressure is created by fluids and gases in our body tissues and…
In which direction does air move and why?
Answer
Air moves from regions of high pressure to regions of low pressure. This movement occurs because air naturally flows to balance pressure differences, creating wind.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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