MCQ Questions

Question No. 1

State True or False and correct the false statement giving reasons

Answer :

(2) In a reservoir water exerts pressure only at the bottom.

(4) A long handle spanner is useful in opening a tight nut.

(5) Pressure created on the ground by a brick is the same when placed on any of its faces.

(6) When the distance of force from the pivot is more, moment also is more.

(7) When the surface area is increased the pressure also increases.

(8) Feet of camels create high pressure on the desert sand.

(9) The only reason for low air pressure on hills is that there is less pollution.

(10) When you are standing the pressure created on the floor is more.

(1) Turning forces create translatory motion.

(3) The turning effect of a force about a pivot is called moment.

Question No. 2

Fill in the blanks

Question No. 3

Short answer type questions

Answer :

(1) What is moment of force?

(3) What are the units of thrust and pressure?

(7) Why deep sea divers wear special suits?

(9) Can you explain how you are able to drink from a straw?

(4) Why sleepers are put under the rail tracts?

(2) How does increase of area affect pressure?

(5) Why do sharp pins work better than blunt pins?

(6) How can you increase pressure when the thrust is low?

(8) How does atmospheric pressure differ on hills from plains?

Question No. 4

Long answer type questions

Answer :

(4) If you have to design a door of heavy wood, why would you want to make it wider?

(7) What are the similarities between pressure created by water and air.

(1) What are clockwise and anticlockwise moments?

(2) Explain by describing an experiment that proves that there is atmospheric pressure around us.

(3) What is the relation between thrust, area and pressure?

(5) Why shoes with pointed heels create deeper impact on soft soil?

(6) Name the factors upon which pressure in liquids depend.

(8) Why are the foundations of high rise buildings made broader?

(9) Give two practical application of our understanding about liquid pressure.

Question No. 5

Match the column

Answer :

Question No. 6

Which of the following statements about atmospheric pressure is correct?

Answer :

Atmospheric pressure on the hills is less because they have low temperature.

Atmospheric pressure at sea level is high because the sea is a very large water body.

Atmospheric pressure of place is higher at night.

Atmospheric pressure above our head depends on the column of air above it.

Question No. 7

Pressure in liquids depends upon :

Answer :

Density and height of the liquid column above the point of measurement

Density and depth of the liquid below the point of measurement.

Density and the depth at which the liquid is kept compared to the sea level.

Density and the volume of the liquid used in the measurement.

Question No. 8

Rotating a body is easy when the force is applied :

Answer :

At the pivot

Far from the pivot

Anywhere on the body

Close to the pivot

Question No. 9

The SI unit of moment of force is :

Answer :

Pascal (Pa)

Newton (N)

dyne

Newton meter

Question No. 10

Pressure and thrust are related as:

Answer :

Pressure = 1/ Thrust

Pressure = Area X Thrust

Pressure = Area / Thrust

Pressure =Thrust /Area

Question No. 11

When a thrust is acting on a surface pressure will increase if :

Answer :

Area of application increases

Thrust acts perpendicularly

Area of application decreases

Area of application is made smooth

Question No. 12

Which of the following is true for pressure exerted by liquids?

Answer :

Pressure remains the same as we go deeper in the sea.

Pressure decreases as we go deep in the sea.

At the same depth pressure is same in all direction.

There is no pressure exerted by liquids in upward direction.

Question No. 13

Which of the following explains the working principle of rubber sucker hooks?

Answer :

They are made of light material like plastics which stick to walls.

High pressure is created inside the cup so they stick to the walls.

The cups create a vacuum and then they are pressed to the walls by air pressure.

Rubber sucker hooks can be fixed anywhere with the help of their hooks.

Question No. 14

Rotating a body is easy when the force is applied :

Answer :

At the pivot

Far from the pivot

Anywhere on the body

Close to the pivot

Question No. 15

Thrust can be defined as :

Answer :

Force acting on a body

Force acting perpendicularly on a surface

Force acting on a unit area

Force acting tangentially on a body

Question No. 16

When a thrust is acting on a surface pressure will increase if :

Answer :

Area of application increases

Thrust acts perpendicularly

Area of application decreases

Area of application is made smooth

Question No. 17

Battle tanks have special caterpillar wheels because :

Answer :

So that they don’t have a tire puncture in the war situation.

These wheels are much stronger than other types of wheels.

To spread the heavy load over larger area so the wheels don’t sink.

They reduce the weight of the tanks and improve fuel efficiency.

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