#### Fluids Book Back Questions

9th Standard

Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
1 x 1 = 1
1. Clouds float in atmosphere because of their low

(a)

density

(b)

pressure

(c)

velocity

(d)

mass

2. 3 x 1 = 3
3. In a fluid, buoyant force exists because pressure at the ____________ of an object is greater than the pressure at the top.

()

bottom

4. The instrument used to measure atmospheric pressure is _____________.

()

Barometer

5. A drinking straw works on the existence of _________.

()

Atmosphere pressure

6. 4 x 1 = 4
7. The weight of fluid displaced determines the buoyant force on an object.

(a) True
(b) False
8. The shape of an object helps to determine whether the object will float.

(a) True
(b) False
9. Archimedes’ principle can also be applied to gases.

(a) True
(b) False
10. Hydraulic press is used in the extraction of oil from oil seeds.

(a) True
(b) False
11. 5 x 1 = 5
12. Density

13. (1)

Milk

14. 1 gwt

15. (2)

$\frac { Mass }{ volume }$

16. Pascal’s law

17. (3)

hpg

18. Pressure exerted by a fluid

19. (4)

980 dyne

20. Lactometer

21. (5)

Pressure

4 x 3 = 12
22. On what factors the pressure exerted by the liquid depends on?

23. Why it is easy to swim in river water than in sea water?

24. State Pascal’s law.

25. The density of water is 1 g cm–3. What is its density in S.I. units?

26. 1 x 5 = 5
27. State the laws of flotation.