Extra Questions: Class 8 Science Chapter 6 Pressure Winds Storms and Cyclones

Practice questions beyond the textbook exercise, testing deeper understanding of pressure, wind formation, and storms for Class 8 Science Chapter 6: Pressure, Winds, Storms and Cyclones. These Class 8 Science Chapter 6 important questions are handy for last-minute exam practice.

Extra Questions: Class 8 Science Chapter 6 Pressure Winds Storms and Cyclones

1. 1 (Assertion-Reason). Assertion: A sea breeze blows from sea to land during the day. Reason: Land heats up faster than the sea, creating a low-pressure region over land.
   Solution: Both true, and the reason correctly explains the assertion — cooler, higher-pressure air over the sea flows in to replace the rising warm air over land.
2. 2 (Numerical). A block exerts a force of 500 N on the ground through a base of area 0.5 m². Find the pressure.
   Solution: Pressure = Force ÷ Area = 500 ÷ 0.5 = 1000 Pa.
3. 3 (Short Answer). Why do camels have wide, flat feet?
   Solution: Wide feet spread the camel’s weight (force) over a larger area, reducing the pressure it exerts on soft desert sand so it doesn’t sink in.
4. 4 (Applied). A nail with a tip of area 0.001 m² is struck with a force of 50 N. Find the pressure at the tip.
   Solution: Pressure = 50 ÷ 0.001 = 50000 Pa — the tiny tip area is what lets a modest force pierce a surface.
5. 5 (Assertion-Reason). Assertion: It is calm at the eye of a cyclone. Reason: The eye is a region of very high pressure surrounded by a ring of the highest wind speeds.
   Solution: Assertion is true, but the reason is false — the eye is actually a region of very low pressure, not high; it’s calm precisely because it’s the centre that surrounding winds spiral into.
6. 6 (Numerical). Two identical vessels hold water to heights of 20 cm and 40 cm. Compare the pressure at their bases.
   Solution: Liquid pressure is proportional to the height of the column (for the same liquid), so the vessel with 40 cm of water has double the pressure at its base compared to the one with 20 cm.
7. 7 (Synthesis). Explain, using the idea of pressure difference and force, why holes are made in banners during storms.
   Solution: Without holes, wind builds up high pressure on the windward face and low pressure behind, and this pressure difference creates a strong net force that can tear the banner loose. Holes let air pass through, equalising pressure on both faces and sharply reducing the net force.
8. 8 (Applied). Why is it unsafe to stand under an isolated tall tree during a thunderstorm?
   Solution: A tall, isolated object offers the shortest, easiest path for a lightning discharge to reach the ground; standing beneath it puts a person directly in that current’s path.
9. 9 (Short Answer). Why do your ears “pop” when going up quickly in a lift or a plane?
   Solution: Outside air pressure drops as you rise, while the air trapped in your middle ear briefly stays at the higher pressure; the popping is the pressure equalising through the Eustachian tube.
10. 10 (Assertion-Reason). Assertion: A cyclone forms only over warm ocean water, not directly over land. Reason: Warm ocean water sustains continuous evaporation and releases the latent heat needed to keep the low-pressure system intensifying.
    Solution: Both true, and the reason correctly explains the assertion — once a cyclone moves onto land, it’s cut off from this moisture/heat source and rapidly weakens.

Written by Satish

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