# 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.

# Mathematics

Force and Pressure

Correct Marks 1

Incorrectly Marks 0

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.

Correct Marks 1

Incorrectly Marks 0

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

A

Magnetic force

Muscular force

C

Electrostatic force

D

Gravitational force

Correct Marks 1

Incorrectly Marks 0

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

Correct Marks 1

Incorrectly Marks 0

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

Correct Marks 1

Incorrectly Marks 0

Q 5. Force is a

A

Pull

B

Push

Pull and push both

D

None of these.

Correct Marks 1

Incorrectly Marks 0

Q 6. The strength of force is expressed by

A

Weight

B

Mass

Magnitude

D

Longitudinal force.

Correct Marks 1

Incorrectly Marks 0

Q 7. The force between two charged bodies is called

A

Muscular force

B

Gravitational force

C

Magnetic force

Electrostatic force.

Correct Marks 1

Incorrectly Marks 0

Q 8. Force acts on an object may change

A

Direction

B

Shape

C

Speed

All of above.

Correct Marks 1

Incorrectly Marks 0

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.

Correct Marks 1

Incorrectly Marks 0

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

Correct Marks 1

Incorrectly Marks 0

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

atmospheric pressure

B

biosphere

C

troposphere

D

all of these

Correct Marks 1

Incorrectly Marks 0

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

Correct Marks 1

Incorrectly Marks 0

Q 13. Force per unit area is called

A

energy

B

work

pressure

D

thrust

Correct Marks 1

Incorrectly Marks 0

Q 14. Atmospheric pressure is measured by

barometer

B

manometer

C

screw gauge

D

none of these

Correct Marks 1

Incorrectly Marks 0

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

Correct Marks 1

Incorrectly Marks 0

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

Correct Marks 1

Incorrectly Marks 0

Q 17. The SI unit of speed is:

A

km/hr

m/s

C

length/second

D

distance/second

Correct Marks 1

Incorrectly Marks 0

Q 18. Wind is a kind of

Contact force

B

Non contact force

C

Action at a distance force

D

None of these

Correct Marks 1

Incorrectly Marks 0

Q 19. Gravitational force is

A

Contact force

B

Repulsive force

Attraction force

D

None of these

Correct Marks 1

Incorrectly Marks 0

Q 20. A contact force cannot act through

Empty space

B

Touching

C

Touching with metal rod

D

Touching with wooden rod

Correct Marks 1

Incorrectly Marks 0

Q 21. Frictional force can’t be measured in

A

kg weight

B

newton

C

dyne

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

Correct Marks 1

Incorrectly Marks 0

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

Correct Marks 1

Incorrectly Marks 0

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

Correct Marks 1

Incorrectly Marks 0

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

Correct Marks 1

Incorrectly Marks 0

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)