#### Forces and Pressure Model Question Paper

8th Standard

Reg.No. :
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Science

Time : 01:00:00 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. The unit of viscosity is

(a)

Nm2

(b)

poise

(c)

kgms–1

(d)

no unit

3. Rain drops are spherical in nature because of _________

(a)

Frictional force

(b)

Buoyant force

(c)

Surface tension

(d)

Viscous force

4. The unit for surface tension is _________

(a)

Nm

(b)

N-1m

(c)

N-1m-1

(d)

Nm-1

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

(a)

Pressure

(b)

Temperature

(c)

Friction

(d)

Force

6. 5 x 2 = 10
7. Give two examples to verify that a force tends to change the static condition of a body.

8. Taking out paste from a tooth paste tube is an example to highlight which physical property?

9. Define one atmosphere.

10. Why are heavy bags provided with broad straps?

11. Why more number of wheels are provided for a heavy goods - carrier?

12. 5 x 3 = 15
13. How do sailors protect their ship during a heavy storm?

14. State Pascal’s law and mention its applications.

15. What is called static pressure of the liquid?

16. Cooking in a place located at a higher altitude is difficult why?

17. What is known as atmospheric pressure?

18. 4 x 5 = 20
19. Give the different types of friction and explain each with an example.

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

21. Explain Buoyant force of a liquid

22. Describe an experiment to show that liquids exert the same pressure in all directions