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CBSE 8th Science Pressure, Winds, Stroms and Cyclones - New Model Questions Papers Study Material - QB365 Set A

Published on: 14/08/2026

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Std: 8th Standard CBSE - Science

chapter: Pressure, Winds, Stroms and Cyclones - New - Model Questions Papers

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Questions:

Multiple Choice Question

8 x 1 = 8

Which Indian scientist Committee?

(a)

Vikram Sarabhai

(b)

Homi Bhabha

(c)

C.V. Raman

(d)

Meghnad Saha

Which type of calendar do astronomers use to track Earth's position with respect to stars?

(a)

Lunar

(b)

Sidereal

(c)

Solar

(d)

Luni-solar

The Moon rises 50 minutes later each day because

(a)

Earth's rotation slows down

(b)

The Moon orbits Earth

(c)

The Sun sets earlier

(d)

The Moon grows in size

The Adhika Maasa is added to

(a)

Add a new festival

(b)

Make calendars lunar

(c)

Balance lunar and solar calendars

(d)

Skip leap years

Why can the Moon sometimes be seen during the afternoon?

(a)

It has its own light

(b)

It is closer to Earth than the Sun

(c)

It reflects sunlight and rises earlier in the day

(d)

It is always opposite the Sun

In coastal areas during daytime, wind blows from

(a)

Land to sea

(b)

Sea to land

(c)

Equally both ways

(d)

None of these

What does the movement of air from high pressure to low pressure areas cause?

(a)

Cyclone

(b)

Wind

(c)

Lightning

(d)

Thunderstorm

When air is blown between two balloons hanging close to each other, they move towards each other. What dees this show about the nature of air?

(a)

Air moves from high pressure to low pressure.

(b)

Air moves from low pressure to high pressure

(c)

Air does not exert pressure

(d)

Air moves equally in all directions

Assertion and reason

2 x 1 = 2

Assertion (A) : Taking shelter under a long tall tree during lightning is unsafe.
Reason (R) : Lightning often strikes taller objects first, and electric charge can travel through them to the ground.
Codes :
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

10.

Assertion (A) : Winds blow from the equator towards the poles.
Reason (R) : The temperature at the equator is higher, causing the air there to rise, creating a low-pressure region.
Codes :
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Short Answer Type Questions

4 x 2 = 8

11.

Explain the difference between Tropical year and Sidereal year. How are they used?
.

12.

List three reasons why festivals in India may fall on different dates in different regions.

13.

During pipeline leaks, water often jets out sideways like a fountain. What does this tell us about liquid pressure?

14.

Complete the statement: "For the same weight, the pressure on the shoulder becomes less when we use _______ straps." Explain briefly.

Long Answer Type Questions

2 x 5 = 10

15.

During a science experiment, students heated a bowl of water and observed bubbles rising from it. The teacher explained how heating affects air and water.
(i) Why does air become lighter on heating?
(ii) How does this property of air play an important role in wind formation?
(iii) Relate this property to one natural phenomenon in our daily life.

16.

One summer afternoon, Meera noticed that the windows of her house started rattling, and a strong wind was blowing outside. She immediately turned off the gas stove and closed the main electrical supply.
(i) Why did Meera experience strong winds on a hot afternoon?
(ii) Explain why it was important for her to turn off the gas stove and main electrical supply during a storm.
(iii) Mention the safety measures Meera followed and suggest one more precaution she could have taken.

Case Study Questions

1 x 4 = 4

17.

Two children are standing on planks in a muddy field and trying to push each other using equal strength. The planks are resting on soft ground. The surface area under child A's plank is 0.8 m² and that under
Child B's plank is 0.4 m², Observe the diagram and answer the questions that follow.

(i) Who will sink deeper into the mud?
(ii) What is the pressure exerted by child A's plank on the ground?
(iii) If both children apply the same force but child B uses a wider plank, what will happen?

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Answers Key:

Multiple Choice Question

8 x 1 = 8

(d)
Meghnad Saha

(b)
Sidereal

(b)
The Moon orbits Earth

(b)
Sea to land

(b)
Wind

(a)
Air moves from high pressure to low pressure.

Assertion and reason

2 x 1 = 2

(a) Both A and R are true and R is the correct explanation of A.
Explanation :
Lightning prefers tall objects, so trees are unsafe.

10.

(b) Both A and R are true, but R is not the correct explanation of A.
Explanation :
Air moves from high pressure to low pressure, and temperature differences create pressure differences, but the actual wind pattern is affected by Earth's rotation (Coriolis effect).

Short Answer Type Questions

4 x 2 = 8

11.

(i) Tropical year is the time between two spring equinoxes (~365.24 days); used in seasonal calendars.
(ii) Sidereal year is the time for Earth to complete one orbit relative to stars (~365.26 days); used by astronomers.
(iii) The sidereal year is ~20 minutes longer due to axial precession.

12.

(i) Sunrise occurs earlier in eastern India and later in western India.
(ii) Different calendar systems (Amant/Purnimant) are followed in different regions.
(iii) Some festivals depend on Moon's position, which may differ slightly by location.

13.

This shows that liquids exert pressure not just downward but also sideways on the walls of the container or pipe. The escaping water forms a jet because the liquid pressure acts outward on the walls at that point.

14.

Broad straps spread the weight of the bag over a larger area. Since pressure = Force ÷ Area, increasing the area reduces pressure on the shoulder, making it more comfortable to carry.

Long Answer Type Questions

2 x 5 = 10

15.

(i) When air is heated, its molecules move apart, decreasing its density, making it lighter than cold air.
(ii) Warm air rises and creates a low pressure area. Cooler air moves to fill this gap, setting up air movement which we feel as wind.
(iii) Sea breeze during the day is an example. Air over land heats up faster than over the sea, so cooler air from the sea moves toward land.

16.

(i) On a hot afternoon, the air near the ground becomes warm and rises up, creating a low-pressure area. Cool air from the surroundings moves in quickly to fill this space, resulting in strong winds.
(ii) During storms, electric wires may break and cause short circuits, and gas stoves can lead to accidental fires due to sudden wind pressure. Turning them off prevents accidents.
(iii) Meera followed two safety measures--turning OFF gas and electricity. Another precaution she should take to stay away from windows and doors to avoid injuries from flying objects.

Case Study Questions

1 x 4 = 4

17.

(i) (b) Child B Because the pressure is more under smaller area (0.4 m²).
(ii) (c) Pressure = Force /Area = 300 N/0.8 m² = 375 Pa
(c) (b) Pressure will decrease Because increased area = Less pressure