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Class 8

Explore popular questions from Force and Pressure for Class 8. This collection covers Force and Pressure previous year Class 8 questions hand picked by experienced teachers.

Force and Pressure

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Q 1. When two unbalanced forces act on a body, in opposite directions, the net force is equal to

A

the sum of the individual unbalanced forces.

B

zero.

difference between the two unbalanced forces and is in the direction of the larger force.

D

difference between the two unbalanced forces and is in the direction of smaller force.

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Q 2. Which of the following is an example of contact force?

A

Magnetic force

Muscular force

C

Electrostatic force

D

Gravitational force

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Q 3. The unit of measuring pressure is

A

newton

newton / metre{tex}^2{/tex}

C

metre{tex}^2{/tex}

D

metre{tex}^2{/tex}/ newton

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Q 4. During dry weather, rubbing a plastic scale with dry hair, attracts small pieces of paper. This is due to

A

gravitational force

electrostatic force

C

frictional force

D

muscular force

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Q 5. Force is a

A

Pull

B

Push

Pull and push both

D

None of these.

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Q 6. The strength of force is expressed by

A

Weight

B

Mass

Magnitude

D

Longitudinal force.

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Q 7. The force between two charged bodies is called

A

Muscular force

B

Gravitational force

C

Magnetic force

Electrostatic force.

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Q 8. Force acts on an object may change

A

Direction

B

Shape

C

Speed

All of above.

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Q 9. The net force on an object is zero if the two forces acting on it in

Opposite direction

B

Same direction

C

Sometimes opposite sometimes same direction.

D

All of above.

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Q 10. Force can affect the state of motion of a body by changing

A

direction or speed

increasing speed

C

decreasing speed

D

all of the above

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Q 11. The pressure exerted by the atmospheric air is known as

atmospheric pressure

B

biosphere

C

troposphere

D

all of these

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Q 12. A wooden piece 5 N in weight and 5 cm × 3 cm × 2 cm in size lies on 5 cm × 2 cm face. The pressure exerted by it in N per cm{tex}^2{/tex} is

A

150

B

50

0.5

D

15

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Q 13. Force per unit area is called

A

energy

B

work

pressure

D

thrust

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Q 14. Atmospheric pressure is measured by

barometer

B

manometer

C

screw gauge

D

none of these

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Q 15. How does pressure vary as we come from mountain top to sea level?

increases

B

decreases

C

remains same

D

depends on weather

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Q 16. Which of the following is true?

A

If an object moves 6 m in 2 second then its speed is zero

B

When an object moves 10 m in 3 second then its speed is 30 m/s

C

Speed = Velocity × Distance

When an object moves 12 m in 4 second then its speed is 3 m/s

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Q 17. The SI unit of speed is:

A

km/hr

m/s

C

length/second

D

distance/second

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Q 18. Wind is a kind of

Contact force

B

Non contact force

C

Action at a distance force

D

None of these

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Q 19. Gravitational force is

A

Contact force

B

Repulsive force

Attraction force

D

None of these

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Q 20. A contact force cannot act through

Empty space

B

Touching

C

Touching with metal rod

D

Touching with wooden rod

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Q 21. Frictional force can’t be measured in

A

kg weight

B

newton

C

dyne

kg ms{tex}^{-1}{/tex}

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Q 22. With the help of given figure, find which of the following options is correct ?

A

The apple pulls with greater force than the earth pulls the apple

B

The apple pulls with smaller force than the earth pulls the apple

The apple pulls the earth with the same force that the earth pulls the apple

D

All of these

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Q 23. When a force is applied to a stationary object, several effects are possible. Which of the following effect is not possible ?

A

The object moves

B

The object rotates

C

The object remains stationary

The mass of the object increases

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Q 24. Satish found that when he hung standard weights on a particular spring, the spring was extended. He measured the length of the spring when 100g, 250 g and 400 g weights were hung on it and recorded the results in the table given below.

Weight used(g) Length of spring (cm)
100 10
250 13
400 16

Satish then hung his textbook on the spring and found that the length of the spring was 14.5 cm. The weight of his textbook in g is _________.

A

275

325

C

300

D

375

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Q 25. Match column-I with Column-II and select the correct option from the codes given below.

Column-I Column-II
(a) A child running to catch the school bus (i) Force can make a stationary object to move
(b) A man blowing a balloon (ii) Force can stop a moving object
(c) A woman pushing a table (iii) Force can change the shape of an object
(d) A cricketer catching a ball (iv) Force can make an object move faster

(a)-(iv), (b)-(iii), c-(i), (d)-(ii)

B

(a)-(iii), b-(ii), (c)-(i), (d)-(iv)

C

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

D

(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)