Class 8 Practice – Level 3 – Set 2 – Force and Pressure

Total questions: 15

A car travels at a constant speed on a straight road. Which of the following is true about the forces acting on it?

No forces are acting on the car

The forces are balanced

There is a net force acting in the direction of motion

Frictional forces are greater than the applied forces

None

How does pressure change with depth in a liquid?

It decreases with depth

It remains constant

It increases with depth

It depends on the shape of the container

None

Why would a person weigh slightly less at the equator than at the poles?

Earth’s gravity is weaker at the equator

Earth’s gravitational pull is stronger at the equator

The person’s mass changes at the equator

The temperature at the equator reduces weight

None

A magnet is placed close to an iron nail, but they don’t touch. Why does the nail still move toward the magnet?

The nail is attracted by a contact force

The magnet attracts only when it touches the nail

The magnetic field exerts a non-contact force on the nail

Gravity pulls the nail toward the magnet

None

Atmospheric pressure decreases with altitude because:

The air becomes denser at higher altitudes

The weight of air above decreases

Gravity is stronger at higher altitudes

Temperature increases with altitude

None

When a ball rolls on grass, it eventually stops. Why does this happen?

Air resistance alone stops the ball

Friction between the ball and grass slows it down

The ball’s weight changes over time

Gravity pulls the ball into the ground

None

A small piece of aluminum sinks in water, but an aluminum boat floats. Why?

The boat displaces more water due to its shape

Aluminum can float only when it's thin

Aluminum is less dense than water when shaped correctly

Small objects sink more easily

None

Why does a book lying on a table remain stationary?

No forces act on it

The gravitational force on the book is balanced by the table’s support force

The table’s force is stronger than gravity

Air pressure holds it down

None

When a closed bottle with a small amount of air is taken from sea level to a high mountain, what happens to the air inside the bottle?

It expands

It compresses

It remains the same

It forms bubbles

None

10.

Why does water pressure at the bottom of a container depend only on height and not on container shape?

Shape determines the pressure

Fluid pressure is influenced only by the height of the liquid column

Shape affects gravity's pull on water

The container walls contribute to pressure

None

11.

Which factor increases frictional force the most between two surfaces?

Smoother surfaces

Rougher surfaces

Smaller contact area

Higher speed

None

12.

What happens to the strength of magnetic force as the distance between a magnet and a metal object increases?

It increases

It remains constant

It depends on the metal's temperature

It decreases

None

13.

Which statement correctly describes gravitational force between two objects?

It increases with distance

It exists only on Earth

It decreases as the distance between objects increases

It depends on an object’s temperature

None

14.

A moving truck suddenly stops due to an obstacle. Which force brings it to a stop?

Gravitational force

Frictional force

Magnetic force

Electrostatic force

None

15.

If a person pushes a wall and the wall does not move, what can be concluded?

The wall exerts an equal force back on the person

The person’s force is greater than the wall’s resistance

No force was applied to the wall

The wall has no reaction

None

1 out of 15

Class 8 Practice – Level 3 – Set 2 – Force and Pressure

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