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#### Forces and Pressure Model Question Paper

8th Standard EM

Reg.No. :
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Science

Time : 01:30:00 Hrs
Total Marks : 50
5 x 1 = 5
1. If we apply a force against the direction of motion of a body, then the body will

(a)

stop moving

(b)

move with an increased speed

(c)

move with a decreased speed

(d)

move in a different direction

2. Pascal’s law is used in

(a)

hydraulic lift

(b)

brake system

(c)

pressing heavy bundles

(d)

All the above

3. The unit of viscosity is

(a)

N m2

(b)

poise

(c)

kg m s–1

(d)

no unit

4. Rain drops are spherical in nature because of _________

(a)

Frictional force

(b)

Buoyant force

(c)

Surface tension

(d)

Viscous force

5. If the area of contact is greater, then the ______ will be greater.

(a)

Pressure

(b)

Temperature

(c)

Friction

(d)

Force

6. 4 x 1 = 4
7. The pressure of a liquid column _____ with the depth of the column.

()

Increases

8. The property of _____ of a liquid surface enables the water droplets to move upward in plants.

()

surface tension

9. A simple barometer was first constructed by _____.

()

Torricelli

10. _________decides whether an object will sink or float

()

Upward force

11. 4 x 1 = 4
12. Force acting on a given area is called pressure.

(a) True
(b) False
13. Friction is the only reason for the loss of energy.

(a) True
(b) False
14. Viscosity depends on the pressure of a liquid.

(a) True
(b) False
15. Force is an action of push or pull

(a) True
(b) False
16. 5 x 1 = 5
17. Static friction

18. (1)

increasing area of contact

19. Friction between the liquid layers

20. (2)

Kg m-1S-1

21. Increase friction

22. (3)

objects are at rest

23. Irregular surface

24. (4)

viscosity

25. Viscous force

26. (5)

cause of friction

5 x 2 = 10
27. Give two examples to verify that a force changes the shape of a body.

28. How does the friction arise between the surfaces of two bodies in relative motion?

29. Define one atmosphere.

30. Which has greater viscosity, oil or honey? Why?

31. Name some things which exert larger pressure on a smaller area?

32. 4 x 3 = 12
33. Define friction. Give two examples of the utility of friction in day to day life.

34. Write down three applications of Pascal’s law.

35. Why is it not advisable to take a fountain pen while travelling in an aeroplane?

36. Why a camel can easily walk on sand?

37. 2 x 5 = 10
38. Give the different types of friction and explain each with an example.

39. Describe an experiment to prove that the pressure in a liquid increases with depth.