CBSE Class 8 Science Chapter 06 Pressure, Winds, Storms, And Cyclones MCQs Set 03

Practice MCQs for Class 8 Science Chapter 06 Pressure, Winds, Storms, And Cyclones

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Question: A needle pierces fabric more easily than a blunt stick when the same force is applied. Which concept from this chapter best explains why?
A. Liquids exert pressure differently than solids
B. A smaller area concentrates force into higher pressure
C. Pressure depends only on the amount of force, not its distribution
D. Sharp objects weigh less and require less effort
Show Answer & Explanation

Answer: (B) A smaller area concentrates force into higher pressure

Explanation:
The needle's pointed end has a much smaller contact area than the blunt stick's flat end. Since pressure equals force divided by area, concentrating the same force over a smaller area produces much greater pressure, making penetration easier.

Question: In Activity 6.1, why do two transparent pipes of different diameters, when filled with water to equal heights, cause identical bulging in their attached balloons?
A. The weight of water is the same in both pipes
B. The pressure depends on the height of the water column, not the volume or diameter
C. The balloons are made of identical rubber
D. The width of each pipe determines how much the balloon bulges
Show Answer & Explanation

Answer: (B) The pressure depends on the height of the water column, not the volume or diameter

Explanation:
• Water pressure in a container depends on the height of the column, not on volume or shape
• Both pipes have water at the same height above the balloon
• Therefore, pressure at the bottom is identical regardless of pipe diameter
• Equal pressure produces equal bulging in both balloons

Question: During a sea breeze on a summer afternoon, air moves from the ocean toward the land. What creates the pressure difference that drives this wind movement?
A. The ocean water is warmer than land, making air above it lighter and causing it to rise
B. Land gets heated faster than water, warm air rises above it, and lower pressure develops over land
C. Ocean currents push air toward the coast
D. Water naturally flows toward land, pushing air ahead of it
Show Answer & Explanation

Answer: (B) Land gets heated faster than water, warm air rises above it, and lower pressure develops over land

Explanation:
Land absorbs heat faster than water during the day. This warming causes the air above land to become lighter and rise, creating a low-pressure area. Cooler, denser air from above the ocean then flows toward this low-pressure zone, resulting in a sea breeze toward land.

Question: When you blow between two hanging balloons that are separated by a gap, they move toward each other rather than away. What does this reveal about high-speed air flow?
A. High-speed winds push objects they encounter
B. High-speed winds create regions of lower pressure
C. The balloons are attracted to moving air
D. Air naturally flows around obstacles
Show Answer & Explanation

Answer: (B) High-speed winds create regions of lower pressure

Explanation:
Blowing air between the balloons creates high-speed flow in that narrow space. According to the chapter, high-speed winds are accompanied by reduced air pressure. The higher atmospheric pressure on the outer sides of the balloons pushes them toward the low-pressure region between them.

Question: In a thunderstorm cloud, positive charges collect at the top and negative charges at the bottom. When the negatively charged base approaches Earth's surface, what change occurs to ground objects?
A. They become negatively charged and repel the cloud
B. They become positively charged, creating attraction toward the cloud
C. They remain neutral because Earth is a good insulator
D. They absorb moisture and become conductive
Show Answer & Explanation

Answer: (B) They become positively charged, creating attraction toward the cloud

Explanation:
The negatively charged cloud base induces positive charge in ground objects through electromagnetic induction. This charge separation builds up until the potential difference becomes so large that air's insulating property breaks down, allowing lightning to strike.

Question: Lightning can occur in multiple scenarios. Which two of the following are mentioned in the chapter as places where lightning can occur?
A. Only within clouds and from clouds to the ground
B. Within clouds and between clouds
C. Only between the ground and clouds
D. From buildings to clouds and from ground to sky
Show Answer & Explanation

Answer: (B) Within clouds and between clouds

Explanation:
The chapter explicitly states that lightning can occur in three ways: within a cloud as opposite charges collide, between separate clouds, or between clouds and the ground.

Question: Why does a cyclone gradually weaken once it reaches land, despite still having organized wind systems?
A. Land friction slows down all winds equally
B. The source of warm, moist air from the ocean is cut off
C. Temperature drops cause water droplets to freeze
D. Land surfaces reflect wind energy back into the atmosphere
Show Answer & Explanation

Answer: (B) The source of warm, moist air from the ocean is cut off

Explanation:
Cyclones form over warm ocean waters because evaporation releases latent heat, which fuels the system. Once over land, this continuous supply of warm, moist air ends. Without this energy source, the cyclone cannot maintain its low pressure and high winds, so it gradually loses strength.

Question: A rubber sucker pressed onto a smooth, flat surface sticks firmly and is difficult to pull off. What is the reason for this strong adhesion?
A. Rubber molecules chemically bond to the surface
B. When pressed, air inside the sucker is pushed out, reducing internal pressure below atmospheric pressure
C. The sucker creates friction through surface roughness
D. The weight of the sucker generates downward pressure
Show Answer & Explanation

Answer: (B) When pressed, air inside the sucker is pushed out, reducing internal pressure below atmospheric pressure

Explanation:
• Pressing the sucker expels most air between it and the surface
• Internal air pressure becomes lower than atmospheric pressure outside
• The pressure difference creates a net inward force holding the sucker in place
• To remove it, you must overcome this pressure-difference force

Question: Trees at a coastal location on a summer afternoon are visibly bent, leaning noticeably toward the land. What can you infer about which side is land and which is sea?
A. The side they lean toward is the sea because wind is strongest there
B. The side they lean toward is the land, where warm air rises and creates lower pressure
C. The side they lean away from must be land because land air is heavier
D. Tree bending depends on time of day, not on land or sea location
Show Answer & Explanation

Answer: (B) The side they lean toward is the land, where warm air rises and creates lower pressure

Explanation:
During daytime, land heats faster than sea, causing air above land to warm, become lighter, and rise. This creates a low-pressure area over land. Wind flows from high pressure (over the sea) toward low pressure (over land), so trees bend in the direction from sea toward land.

Question: When two identical balloons are connected by a straw such that one is inflated and the other is deflated, air gradually transfers between them. At what point does air movement completely stop?
A. When one balloon becomes larger than the other
B. When the pressure in both balloons becomes equal
C. When one balloon runs out of air
D. When the temperature of both balloons matches
Show Answer & Explanation

Answer: (B) When the pressure in both balloons becomes equal

Explanation:
Air flows from a region of high pressure to low pressure. Movement continues only while a pressure difference exists between the balloons. Once both reach the same pressure, there is no longer a driving force, and air movement ceases.

Question: Large outdoor banners and hoardings have numerous holes punched through them rather than being solid surfaces. According to the chapter's principles, what is the practical reason for this design?
A. Holes reduce the weight of the banner
B. Holes allow advertisement text to show through on both sides
C. Holes reduce the effective surface area facing wind, lowering the force and pressure that can damage the banner
D. Holes prevent water from pooling during rain
Show Answer & Explanation

Answer: (C) Holes reduce the effective surface area facing wind, lowering the force and pressure that can damage the banner

Explanation:
High-speed winds create regions of lower pressure. When wind encounters a solid banner surface, the large area allows high wind pressure to accumulate, creating strong forces that can topple the banner. Holes reduce the effective surface area exposed to wind pressure, significantly decreasing the total force and making the banner more resistant to damage.

Question: In Activity 6.6, as you blow harder between two suspended balloons, they approach each other faster. What does this observation indicate about the relationship between wind speed and air pressure?
A. Wind speed and pressure are unrelated
B. Higher wind speeds result in even lower pressure in that region
C. Faster wind speeds generate higher pressure in all directions
D. Wind speed affects only humidity, not pressure
Show Answer & Explanation

Answer: (B) Higher wind speeds result in even lower pressure in that region

Explanation:
Blowing harder creates faster air flow between the balloons, which reduces the pressure in that space even more. The greater pressure difference between outside (atmospheric) and inside (between balloons) pushes the balloons together with greater force, causing them to approach faster.

Question: When lightning strikes during a thunderstorm, it rapidly heats the air around it. What acoustic phenomenon results from this rapid heating, as explained in the chapter?
A. A whistling sound from the electrical discharge
B. Thunder, a loud sound produced by expanding air
C. A crackling noise from ionized particles
D. A rumbling from cloud vibrations
Show Answer & Explanation

Answer: (B) Thunder, a loud sound produced by expanding air

Explanation:
Lightning instantaneously heats the air to extremely high temperatures. This rapid heating causes the air to expand explosively. This sudden expansion of air produces the loud sound we perceive as thunder.

Question: If the force exerted by atmospheric air on a 15 cm × 15 cm area equals the weight of a 225 kg object, why are humans not crushed by this enormous atmospheric pressure?
A. Human skin is impermeable to air pressure
B. The pressure inside our bodies equals atmospheric pressure due to fluids and gases, balancing external pressure
C. Gravity counteracts atmospheric pressure
D. Human bodies are mostly water, which resists compression
Show Answer & Explanation

Answer: (B) The pressure inside our bodies equals atmospheric pressure due to fluids and gases, balancing external pressure

Explanation:
Our internal body fluids and gases exert pressure equal to atmospheric pressure. Since pressures are balanced inside and outside, there is no net crushing force. We only feel pressure differences; equal pressure on all sides produces no harmful effect.

Question: During the formation of a thunderstorm, strong winds move both upward and downward through clouds. How does this bidirectional motion lead to electric charge development?
A. Wind friction directly converts kinetic energy into electrical energy
B. Water droplets and ice particles collide and rub against each other, causing charge separation through friction
C. The pressure changes in moving air ionize atmospheric gases
D. Rising and falling air currents create magnetic fields that induce charges
Show Answer & Explanation

Answer: (B) Water droplets and ice particles collide and rub against each other, causing charge separation through friction

Explanation:
As vertical winds cause water droplets and ice particles to move in opposite directions and collide repeatedly, friction between these particles transfers electrons from one to another. This rubbing motion is the mechanism for developing the static electric charges that accumulate in storm clouds.

Question: At a seacoast during a summer afternoon, trees are clearly bent, their tops leaning toward the land. Using knowledge of sea breeze formation, which interpretation is correct?
A. The sea side is to the left and land is to the right because trees are pushed by sea wind
B. The land side is toward the direction trees are leaning because warm air there creates lower pressure pulling wind from the sea
C. Trees always lean toward the nearest water source regardless of wind direction
D. The bending direction indicates nighttime land breeze, not daytime sea breeze
Show Answer & Explanation

Answer: (B) The land side is toward the direction trees are leaning because warm air there creates lower pressure pulling wind from the sea

Explanation:
On summer afternoons, land heats faster than ocean, causing air above land to rise and creating a low-pressure zone. Wind flows from high-pressure regions (ocean) toward low-pressure regions (land), bending trees toward land. The direction trees lean toward indicates where the low-pressure area and thus land is located.

Question: When high-speed winds blow over houses during a storm, owners are advised to open doors and windows. According to pressure principles in the chapter, why does this action help protect roofs from being blown away?
A. Opening doors reduces the speed of wind entering the house
B. Open doors equalize pressure inside and outside, reducing the pressure difference that could lift the roof
C. Wind escapes through open windows, reducing overall wind speed
D. Open doors and windows are structurally stronger than closed ones
Show Answer & Explanation

Answer: (B) Open doors equalize pressure inside and outside, reducing the pressure difference that could lift the roof

Explanation:
• High-speed winds over roofs create reduced pressure above
• With doors and windows closed, high pressure inside exceeds low pressure above
• This difference creates an upward force that can blow the roof off
• Opening doors/windows allows air exchange, equalizing inside and outside pressure
• Equal pressure eliminates the upward force that would lift the roof

Question: In the formation of a cyclone, warm ocean water evaporates, the water vapor rises and condenses into raindrops. Why is the condensation process critical to cyclone intensification?
A. Condensation cools the rising air, making it denser and stopping its ascent
B. When water vapor condenses, it releases latent heat into the atmosphere, further warming and lifting the rising air
C. Condensation removes moisture from clouds, making them lighter
D. Raindrops falling back to the ocean reduce water evaporation
Show Answer & Explanation

Answer: (B) When water vapor condenses, it releases latent heat into the atmosphere, further warming and lifting the rising air

Explanation:
During evaporation, water absorbs heat. When this vapor later condenses into droplets, that stored heat is released back into the atmosphere. This heat release further warms the ascending air, making it even lighter and causing it to rise higher, which lowers pressure even more and intensifies the cyclone.

Question: A lightning conductor is installed on buildings with one end pointed upward above the building's highest point. What is the primary function of this conductor design?
A. The pointed end attracts lightning preferentially to the conductor instead of the building
B. The pointed end ionizes air to prevent lightning formation
C. The conductor dissipates electrical charges harmlessly into the ground
D. The pointed shape reduces the conductor's weight
Show Answer & Explanation

Answer: (C) The conductor dissipates electrical charges harmlessly into the ground

Explanation:
The pointed end extends above the building to intercept lightning strikes preferentially. More importantly, the conductor provides an easy conducting path for electrical charges to flow safely into the ground, dissipating the lightning's energy safely away from the building structure.

Question: Regarding pressure in containers of liquid, two vessels A and B are filled with water to identical heights. Vessel A is narrow and Vessel B is wide. Which statement about pressure at the bottom is true?
A. Pressure is higher in vessel A because water is concentrated in a narrower space
B. Pressure is higher in vessel B because it holds more total water
C. Pressure is equal in both vessels because it depends on the height of the column, not the vessel's shape or total volume
D. Pressure cannot be compared without knowing the weight of water in each vessel
Show Answer & Explanation

Answer: (C) Pressure is equal in both vessels because it depends on the height of the column, not the vessel's shape or total volume

Explanation:
Liquid pressure at any depth depends solely on the height of the column above that point and the liquid's density. Since both vessels have water at the same height, the pressure at the bottom is identical, regardless of the vessel's diameter or the total amount of water it contains.

Question: After a cyclone moves over land and gradually loses strength, what is one major consequence for agricultural land that the chapter specifically mentions?
A. Cyclones cause excessive freshwater flooding that makes soil too wet for crops
B. Seawater pushed inland by cyclone winds can contaminate soil with salt, reducing fertility
C. Cyclones create deep cracks in soil that make farming impossible
D. Heavy rainfall causes topsoil to harden and become impenetrable
Show Answer & Explanation

Answer: (B) Seawater pushed inland by cyclone winds can contaminate soil with salt, reducing fertility

Explanation:
When cyclone winds push ocean water inland as a surge 3-12 meters high, the salt in seawater contaminates agricultural land. This salt accumulation makes soil less fertile, directly damaging crops and reducing the land's agricultural productivity for extended periods.

Question: In Activity 6.2, when holes at the same depth in a water-filled bottle are opened simultaneously, water flows out with equal force from all holes. What principle of liquid pressure does this demonstrate?
A. Liquids exert more pressure at the bottom of containers than at the top
B. Liquids exert equal pressure in all directions at a given depth
C. The force of water depends on the size of the hole
D. Water pressure is strongest where the container is widest
Show Answer & Explanation

Answer: (B) Liquids exert equal pressure in all directions at a given depth

Explanation:
Equal water jets from holes at equal depth show that liquid pressure is independent of direction—it acts perpendicular to the surface in all directions equally. This is why water spurts with equal force from every hole at the same level, illustrating the isotropic nature of liquid pressure.

Question: Why do overhead water tanks need to be placed at significant heights above the level where water will be used, rather than at ground level?
A. Height prevents contamination of water by ground-level pollutants
B. Height creates gravitational potential energy that is later converted to useful heat
C. Height increases the water column above the taps, generating sufficient pressure for good water flow
D. Height allows the tank to hold more water without increasing its capacity
Show Answer & Explanation

Answer: (C) Height increases the water column above the taps, generating sufficient pressure for good water flow

Explanation:
Pressure exerted by a liquid depends on the height of its column. When a tank is elevated, the greater height of water above the taps creates greater pressure, resulting in a stronger water stream. This is why taps on higher floors of buildings receive weaker flow—they have a smaller water column height above them.

Question: In a thunderstorm, which of the following correctly describes the locations of electrical charges before lightning occurs?
A. All charges remain uniformly distributed throughout the cloud
B. Positive charges collect at the cloud top, negative charges at the cloud bottom, and the ground becomes negatively charged
C. Positive charges occupy the cloud bottom while negative charges remain in the upper atmosphere
D. All electrical charge exists only in the ground; clouds are electrically neutral until lightning strikes
Show Answer & Explanation

Answer: (B) Positive charges collect at the cloud top, negative charges at the cloud bottom, and the ground becomes negatively charged

Explanation:
During thunderstorm development, strong upward and downward winds rub ice particles (becoming positively charged and rising) against water droplets (becoming negatively charged and sinking). This charge separation leaves positive charge at the cloud top and negative charge at the base. The negatively charged cloud base induces positive charge in ground objects, setting up the potential for lightning.

Question: When a bag with narrow straps is carried on shoulders alongside an identical bag with broad straps, both having the same weight, the narrow-strap bag feels more uncomfortable. According to the pressure concept explained in this chapter, which explanation correctly accounts for this difference in comfort?
A. The narrow straps concentrate the force over a smaller area, producing higher pressure on the shoulders
B. The narrow straps allow the bag to hang at a better angle, distributing weight differently
C. The broad straps weigh more than the narrow straps, causing the bag to shift position
D. The narrow straps are made of inferior material that deforms under pressure
Show Answer & Explanation

Answer: (A) The narrow straps concentrate the force over a smaller area, producing higher pressure on the shoulders

Explanation:
Pressure is defined as force per unit area. When the same force (weight) is applied over a smaller area—as with narrow straps—the resulting pressure increases. This higher pressure concentration causes greater discomfort compared to broad straps, which spread the same force over a larger area and thus reduce pressure on the shoulders.

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