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Force And Pressure - Important Questions Model Paper In 8th Science

Published on: 02/08/2018

From the chapter Force and Pressure, some of the important questions are covered in this question paper. The questions are covers from the Higher Order Thinking Questions and Value Based Questions.

Download CBSE Class 8th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 8th Standard CBSE Science

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Std: 8th Standard CBSE - Science

chapter: - Model Question paper

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Questions:

Generic 3

6 x 3 = 18

Briefly mention and explain two factors that affect the effect of changes.

A chapati maker is a machine which converts balls of dough into chapatis. What effect of force comes into play in this process?

Briefly explain how do we experience force in our daily life.

A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.

Give two examples of situations in which applied force causes a change in the shape of an object.

Give two examples each of situations in which you push or pull to change the state of motion of objects.

Generic 2

5 x 2 = 10

While sieving grains, small pieces fall down. Which force pulls them down?

Briefly mention the interaction of poles of two magnets.

During dry weather, clothes made of synthetic fibre often stick to the skin. Which type of force is responsible for this phenomenon?

10.

Does the palm apply any force on the ball, when we place our palm in front of a moving ball?

11.

A girl is pushing a box towards East direction. In which direction should her friend push the box so that it moves faster in the same direction?

Generic 5

2 x 5 = 10

12.

Two women are of the same weight. One wears sandals with pointed heels while the other wears sandals with flat sales. Which one would feel more comfortable while walking on a sandy beach? Give reasons for your answer .

13.

It is much easier to burst an inflated balloon with a needle than by a finger. Explain.

Multiple Choice Question

10 x 1 = 10

14.

Some mustard oil is kept in the beaker. It will exert pressure

(a)

upward

(b)

downward

(c)

sideways

(d)

in all the directions

15.

Type of force where only attraction is found

(a)

electrostatic force

(b)

magnetic force

(c)

gravitational force

(d)

Both (a) and (b)

16.

Force is due to

(a)

motion

(b)

an interaction

(c)

collision

(d)

None of these

17.

The standard value of atmospheric pressure is

(a)

78 cm of Hg

(b)

76 mm of Hg

(c)

45 cm of Hg

(d)

0.76 cm of Hg

18.

Two objects repel each other. This repulsion could be due to

(a)

frictional force

(b)

electrostatic force

(c)

magnetic force

(d)

either a magnetic or an electrostatic force

19.

Which one of the following forces is a contact force?

(a)

Force of gravity

(b)

Force of friction

(c)

Magnetic force

(d)

Electrostatic force

20.

Force due to the charged particles is known as

(a)

muscular force

(b)

magnetic force

(c)

electrostatic force

(d)

gravitational force

21.

In the circuit shown in figure, when the circuit is completed, the hammer strikes the gong. Which of the following force is responsible for the movement of hammer?

(a)

Gravitational force alone

(b)

Electrostatic force alone

(c)

Magnetic force alone

(d)

Frictional force alone

22.

The pressure exerted by liquid due to increase in depth

(a)

reduces

(b)

increases

(c)

remains same

(d)

depends on the nature of liquid

23.

State of motion is described by

(a)

position of rest

(b)

position of motion

(c)

Both (a) and (b)

(d)

None of these

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Answers Key:

Generic 3

6 x 3 = 18

There are two factors that affect the effect of changes, they are
(i) Magnitude usually expresses the strength of force.
(ii) When the force is applied on the body, then at that moment the force acts, has direction as well.
So, if the magnitude or direction of force or both, Change, then its effect also changes.

The force on unit area is called pressure, works on the chapatis. This is the pressure which works on the dough balls and make them chapatis with the help of machine.

Since, there are many actions which give us the feeling of force like we hit or catch many objects in our regular routine. Most of the times, we see that the moving ball stops after sometime and it changes the direction of motion when it is hit by a bat also, when we compress a spring, its shape and size changes.

Two forces are as follows:
(i) Gravitational force
(ii) Friction due to air or force of friction

The two examples are as follows:
(i) Spring When we compress or stretch the spring, it changes its shape.
(ii) Foam When we compress the foam or sponge, it changes its shape.

The two examples are as follows:
(i) We push the door to open it.
(ii) We pull a drawer to open it.

Generic 2

5 x 2 = 10

It is the force of gravity which is responsible for the grains to fall down.

The interaction of poles of two magnets are
(i) Unlike poles attract each other
(ii) Like poles repel each other.

The electrostatic force starts working between the cloth made of synthetic fibre and sticks to skin.

10.

Yes, when we place our palm in front of a moving ball, then the palm apply a force on the moving ball and stop it.

11.

Her friend should push the box towards East direction, so that it will start moving more fast towards East because the magnitude of force increases.

Generic 5

2 x 5 = 10

12.

While walking on a sandy surface, one needs the footwears of larger area so that the pressure exerted on the ground is minimum. So, in this case, the woman having the sandals with pointed heels will be less comfortable in walking while the other woman wears sandals with flat sales feels more comfortable while walking on sandy beach.

13.

Because needle tip has very less area of cross-section in comparison to that of our finger and we know that pressure exerted by a force is inversely proportional to the area where it has been applied, so pressure exerted will be more by the needle tip than the finger.

Multiple Choice Question

10 x 1 = 10

14.