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Mechanics and Properties of Matter

13. 

A swimmer finds it easier to swim in sea water than in plain water. Why?

A. sea water has less contamination B. sea waves help a swimmer to swim C. sea water has higher density than plain water D. sea has a much higher volume of water

Answer : C. sea water has higher density than plain water

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14. 

why do we see bubbles coming out when a brick is immersed in water?

A. air trapped inside the brick comes out B. the density of brick is greater than the density of water C. the density of brick is lesser than the density of water D. the water displaced by the brick evaporates fast

Answer : A. air trapped inside the brick comes out

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15. 

At 0o C the density of ice 0.96 of water. If 1 Cu.m. of water is solidified at 0oC. We can infer:
i) Density of all liquids are higher when solidified;
ii) Ice will float at 0o C in water, half submerged and half above the surface of water;
iii) when solidified water expands.

A. only (i) B. only (ii) C. only (iii) D. (i) and (iii)

Answer : C. only (iii)

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16. 

the blood circulation in muscle is due to

A. thin density of blood B. viscosity of blood C. capillary action D. absorption

Answer : C. capillary action

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17. 

Density of mercury is __________ times the density of water

A. 2.4 B. 1.36 C. 13.6 D. 6.31

Answer : C. 13.6

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18. 

Density of the matter is defined as

A. mass / volume B. mass x volume C. volume / mass D. none of these

Answer : A. mass / volume

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