Students can practice the best Class 8 Science MCQ and Pressure Winds Storms and Cyclones Class 8 Science Curiosity Chapter 6 MCQ Online Test with Answers for exam preparation.
Class 8 Science Chapter 6 Pressure Winds Storms and Cyclones MCQ
Pressure Winds Storms and Cyclones MCQ
Class 8 Science Chapter 6 MCQ Online Test
Question 1.
Two balloons hanging close to each other move towards each other when air is blown between them. What does this activity prove? (Competency Based Que.)
(a) Air exerts pressure equally in all directions
(b) High speed wind increases air pressure
(c) High speed wind lowers air pressure
(d) Air has weight
Answer:
(c) High speed wind lowers air pressure
Question 2.
What happens to air pressure when wind speed increases?
(a) Increases
(b) Decreases
(c) Remains same
(d) Depends on temperature
Answer:
(b) Decreases
Question 3.
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
Answer:
(a) Air moves from high pressure to low pressure.
Question 4.
Why does breathing become harder as we climb a Mountain?
(a) There is more oxygen in the air at higher altitudes.
(b) The air pressure decreases, making it harder for the lungs to expand.
(c) There is less oxygen in the air at higher altitudes.
(d) The wind blows stronger at higher altitudes.
Answer:
(b) The air pressure decreases, making it harder for the lungs to expand.
Question 5.
Why does a roof of a hut fly away during a strong storm?
(a) Air below the roof moves faster
(b) Pressure above the roof becomes less than below it
(c) Air below the roof becomes lighter
(d) Roof becomes positively charged
Answer:
(b) Pressure above the roof becomes less than below it
Question 6.
Which of these conditions will lead to the formation of wind?
(a) Equal pressure everywhere
(b) Low pressure and high pressure regions
(c) Condensation of water vapour
(d) Friction between water droplets
Answer:
(b) Low pressure and high pressure regions
Question 7.
A balloon bursts when over-inflated because
(a) air loses pressure
(b) pressure inside exceeds outside
(c) pressure inside equals outside
(d) air becomes lighter
Answer:
(b) pressure inside exceeds outside
Question 8.
A cyclone is formed mainly because
(a) Heavy rainfall causes flooding
(b) Warm moist air rises rapidly over oceans
(c) Earth’s rotation creates high pressure
(d) Strong winds blow from land to sea
Answer:
(b) Warm moist air rises rapidly over oceans
Question 9.
Lightning occurs due to
(a) heating of air by sunlight
(b) rubbing of water droplets and ice particles in clouds
(c) movement of wind from sea to land
(d) sudden condensation of vapour
Answer:
(b) rubbing of water droplets and ice particles in clouds
Question 10.
What does the movement of air from high pressure to low pressure areas cause?
(a) Cyclone
(b) Wind
(c) Lightning
(d) Thunderstorm
Answer:
(b) Wind
Question 11.
In coastal areas during daytime, wind blows from
(a) Land to sea
(b) Sea to land
(c) Equally both ways
(d) None of these
Answer:
(b) Sea to land
Question 12.
Why does a cyclone become stronger over warm sea water?
(a) Heat provides energy to rising air
(b) Pressure becomes high
(c) Sea level falls
(d) Rotation stops
Answer:
(a) Heat provides energy to rising air
Question 13.
The centre of a cyclone is called
(a) Storm eye
(b) Calm zone
(c) Eye of the storm
(d) Middle pressure
Answer:
(c) Eye of the storm
Question 14.
Which phenomenon proves air exerts pressure in all directions?
(a) Roof flying off
(b) Punctured tyre
(c) Balloons collapsing when air escapes
(d) Boiling water
Answer:
(c) Balloons collapsing when air escapes
Question 15.
Why is sitting in a car during lightning safer?
(a) Rubber tyres stop electricity
(b) Car moves faster
(c) Metal body conducts electricity to ground
(d) Glass windows stop charges
Answer:
(c) Metal body conducts electricity to ground
Question 16.
When an inverted glass full of water is held tightly covered by a card, the water does not fall out. What does this show?
(a) Water has no weight
(b) Air exerts pressure upward
(c) Gravity does not act on water
(d) Card is waterproof
Answer:
(b) Air exerts pressure upward
Question 17.
Air above heated land rises. What immediate effect does this create at ground level?
(a) High pressure at ground
(b) Low pressure at ground
(c) No change in pressure
(d) Wind stops blowing
Answer:
(b) Low pressure at ground
Question 18.
A strip of paper lifts when air is blown across its top surface. What conclusion can be drawn?
(a) Moving air exerts more pressure
(b) Moving air exerts less pressure
(c) Paper becomes lighter
(d) Gravity decreases
Answer:
(b) Moving air exerts less pressure
Question 19.
A thunderstorm includes which of the following?
(a) Only strong winds
(b) Only heavy rainfall
(c) Lightning with thunder (often with rain/wind)
(d) Falling hailstones only
Answer:
(c) Lightning with thunder (often with rain/wind)
Question 20.
The calm, clearer region in the middle of a very large rotating storm over the sea is called
(a) storm front
(b) eye wall
(c) eye of the cyclone
(d) spiral band
Answer:
(c) eye of the cyclone
Pressure Winds Storms and Cyclones Class 8 Assertion Reason Questions
The following questions consist of two statements.
Assertion (A) and Reason (R). Answer the following questions by selecting the appropriate option given below
(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.
Question 1.
Assertion (A) A school bag with thin straps feels more painful on the shoulders than one with broad straps.
Reason (R) For the same force, pressure increases when the area of contact decreases.
Answer:
(a) Both A and R are true and R is the correct explanation of A. Thin straps reduce area, increasing pressure.
Question 2.
Assertion (A) Sheets of tin or thatch roofs may fly off during a severe storm.
Reason (R) Fast-moving air above the roof creates a low-pressure region, so higher pressure below pushes the roof upward.
Answer:
(a) Both A and R are true and R is the correct explanation of A. Fast winds lower pressure above the roof; higher pressure below lifts it.
Question 3.
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
Answer:
(b) 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)
Question 4.
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.
Answer:
(a) Both A and R are true and R is the correct explanation of A. Lightning prefers tall objects, so trees are unsafe.
Question 5.
Assertion (A) During a cyclone, the air pressure in the central region is much lower than in the surrounding areas.
Reason (R) Air always moves from a region of lower pressure to a region of higher pressure.
Answer:
(c) In a cyclone, low pressure at the centre causes surrounding high-pressure air to rush in, creating strong winds. However, air moves from high pressure to low pressure not the other way around, so the reason is incorrect.
Question 6.
Assertion (A) Clothes dry more quickly on a windy day.
Reason (R) Moving air removes water vapour from around wet clothes faster.
Answer:
(a) Both A and R are true and R is the correct explanation of A.
Question 7.
Assertion (A) Standing in an open field during a thunderstorm is unsafe.
Reason (R) Lightning discharge may travel through the body to reach the ground.
Answer:
(a) Both A and R are true and R is the correct explanation of A.
Question 8.
Assertion (A) At night, wind blows from the sea to the land.
Reason (R) Land cools faster and therefore becomes a low-pressure region at night.
Answer:
(d) A is false but R is true.
Pressure Winds Storms and Cyclones Class 8 Case Based MCQ Questions
Question 1.
During the day, the land heats up faster than the sea. The warm air over the land rises, creating a low pressure zone. The cooler air over the sea has high pressure, so it moves towards the land. This movement of air causes a breeze that brings relief during hot days in coastal areas. (Competency Based Que.)
(i) Which pressure difference is responsible for the movement of air shown in the figure?
(a) High pressure on land, low on sea
(b) Low pressure on land, high on sea
(c) High pressure on both land and sea
(d) Low pressure on both land and sea
Answer:
(b) Low pressure on land, high on sea
(ii) What is this phenomenon called?
(a) Land breeze
(b) Sea breeze
(c) Monsoon wind
(d) Cyclone wind
Answer:
(b) Sea breeze
(iii) Why does the air over land rise up during the day?
(a) Land reflects more heat
(b) Land cools faster than water
(c) Land heats up quickly and makes air warmer
(d) Water heats up faster than land
Answer:
(c) Land heats up quickly and makes air warmer
Question 16.
One evening in a coastal town, the sky darkened quickly. Gusty winds began, followed by flashes of light in the clouds and loud sounds a few seconds later. Rain fell heavily for about twenty minutes and then slowed. The local weather officer called it a “local storm common in summer.”
(i) The event described is best called a
(a) Cyclone
(b) Thunderstorm
(c) Dust storm
(d) Sea breeze
Answer:
(b) Thunderstorm
(ii) The flashes seen in the clouds were due to
(a) Reflection of sunlight
(b) Electric discharge (lightning)
(c) Moonlight
(d) Fireworks
Answer:
(b) Electric discharge (lightning)
(iii) Hearing thunder after seeing the flash is because
(a) Sound travels slower than light
(b) Light travels slower than sound
(c) Rain blocks the sound
(d) Clouds absorb light
Answer:
(a) Sound travels slower than light
Pressure Winds Storms and Cyclones Class 8 Fill in the blanks
1. Air always moves from a region of _____________ pressure to a region of _____________ pressure.
Answer:
high, low
2. The pressure exerted by air around us is called _____________ pressure.
Answer:
atmospheric
3. The centre of a cyclone is called the _____________ where weather is relatively calm.
Answer:
eye
4. Warm air is _____________ than cold air, so it rises up.
Answer:
lighter
5. High speed winds are always accompanied by a drop in _____________ .
Answer:
air pressure
6. A cyclone forms over _____________ ocean water when warm moist air rises quickly.
Answer:
warm
7. The local name for thunderstorms in West Bengal and Bihar is _____________ .
Answer:
Kalbaisakhi
8. Lightning occurs due to the accumulation of _____________ charges inside a cloud.
Answer:
electric
6. During the day in coastal areas, wind blows from the _____________ toward the _____________.
Answer:
sea, land
7. Cyclones are usually accompanied by heavy _____________ and very strong _____________.
Answer:
rainfall (rain)/rains, wind
8. Heated air becomes _____________ than cold air and therefore upward.
Answer:
lighter, rises
Pressure Winds Storms and Cyclones Class 8 True or False
1. Air pressure increases when wind speed increases.
Answer:
False
2. Warm air is heavier than cold air.
Answer:
False
3. The eye of a cyclone has calm weather with no clouds.
Answer:
True
4. Winds blow from low-pressure area to high-pressure area.
Answer:
False
5. Mango Showers help in ripening of mangoes in southern India.
Answer:
True
6. Lightning happens because of the rotation of the Earth.
Answer:
False
7. Cyclones are called hurricanes in North America.
Answer:
True
8. During a thunderstorm, it is safe to take shelter under a tree.
Answer:
False
9. A cyclone always forms over warm ocean water.
Answer:
True
10. High speed winds can cause roofs of houses to fly away.
Answer:
True
9. Lightning can strike people standing in open fields.
Answer:
True
10. Air pressure remains the same at all heights above sea level.
Answer:
False
11. After sunset, land cools faster than the sea.
Answer:
True
12. Cyclone shelters are normally built in low-lying ground so floodwater can enter easily.
Answer:
False
Pressure Winds Storms and Cyclones Class 8 Match the following
Question 1.
Match the Column I with Column II.
| Column I | Column II |
| A. Pressure | 1. Strong winds + rain |
| B. Wind | 2. Strom with lightning |
| C. Storm | 3. Force per unit area |
| D. Thunderstorm | 4. Air moving from high to low pressure |
| E. Cyclone | 5. Rotating low pressure system |
Answer:
A – 3, B – 4, C – 1, D – 2, E – 5
| Column I | Column II |
| A. Pressure | 3. Force per unit area |
| B. Wind | 4. Air moving from high to low pressure |
| C. Storm | 1. Strong winds + rain |
| D. Thunderstorm | 2. Strom with lightning |
| E. Cyclone | 5. Rotating low pressure system |
Question 2.
Match the Column I with Column II.
| Column I | Column II |
| A. Thin bag straps hurt | 1. Higher pressure pushes roof up |
| B. Cloth pad on head-load | 2. Warm air rises (lighter) |
| 3. Larger area reduces pressure | |
| D. Roof blown off in storm | 4. Low pressure between balloons |
| E. Heated land air | 5. Small area increases pressure |
Answer:
A – 5, B – 3, C – 4, D – 1, E – 2
| Column I | Column II |
| A. Thin bag straps hurt | 5. Small area increases pressure |
| B. Cloth pad on head-load | 3. Larger area reduces pressure |
| C. Blowing between balloons | 4. Low pressure between balloons |
| D. Roof blown off in storm | 1. Higher pressure pushes roof up |
| E. Heated land air | 2. Warm air rises (lighter) |