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Class 8 Practice – Level 3 – Set 1 – Force and Pressure
Total questions: 15
1.
When you push a box across a floor, which of the following pairs of forces act on it in opposite directions?
Gravitational force and applied force
Normal force and frictional force
Applied force and frictional force
Gravitational force and frictional force
None
2.
An object that floats in water might sink in another liquid. This behavior is determined by:
The object’s color
The object’s mass
The object’s shape
The density of the liquid compared to water
None
3.
Two identical containers are filled with water and oil to the same height. At the bottom of each container, where will the pressure be higher?
In the container with water
In the container with oil
Both will have the same pressure
It depends on the temperature
None
4.
A soccer player kicks a stationary ball on the ground, and it begins to move. Which of Newton’s laws does this illustrate?
First law
Second law
Third law
Law of gravitation
None
5.
Why do your ears "pop" when you ascend a mountain or take off in an airplane?
Due to temperature changes
Because of muscle contractions
Because the air pressure changes more rapidly outside than inside the ear
Because of gravitational forces on the ear
None
6.
Which of the following is an example of force transmitted through a liquid?
Pushing a cart
Inflating a balloon with air
Dropping a stone into water
Hydraulic brakes in a vehicle
None
7.
Why do most high-speed trains and aircraft have streamlined shapes?
To reduce mass
To increase weight for stability
To minimize friction from air resistance
To balance forces equally
None
8.
Why does a heavier object roll down an inclined plane faster than a lighter one?
Heavier objects experience less friction
Gravitational pull is stronger on heavier objects
Both objects accelerate equally due to gravity; other factors like friction may vary
It depends on the color of the objects
None
9.
If you were to weigh yourself on top of a tall mountain, you would find that your weight is:
More than at sea level
Less than at sea level
The same as at sea level
Dependent on air pressure
None
10.
Why is it dangerous to heat a sealed container?
Heating reduces the container’s mass
It increases the density of the container
Heating increases the internal pressure, which could cause the container to burst
It reduces the volume of the container
None
11.
A ball moving on a flat surface gradually comes to a stop because:
Gravity pulls it downwards
Air resistance and friction oppose its motion
The ball loses its mass
The ball increases its mass
None
12.
If a gas-filled balloon is taken to a place with lower atmospheric pressure, the balloon will:
Expand
Shrink
Remain the same
Become heavier
None
13.
An object sinks in water but displaces a certain volume of it. What can be inferred about the weight of the object relative to the weight of the displaced water?
The object weighs less than the displaced water
The object weighs more than the displaced water
The object and displaced water have equal weight
The weight of the object depends on its volume only
None
14.
If a constant force is applied on an object in the opposite direction of its motion, the object’s velocity will:
Increase
Decrease
Remain unchanged
Cause the object to move in a circle
None
15.
Why does increasing the surface area of an object not necessarily increase friction?
Friction is unaffected by surface area in most cases
Greater surface area increases pressure
Friction depends only on weight and type of surfaces
Surface area determines friction only in liquids
None
1 out of 15
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