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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?

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?

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.

Answer : C. only (iii)

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16. 

the blood circulation in muscle is due to

Answer : C. capillary action

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17. 

Density of mercury is __________ times the density of water

Answer : C. 13.6

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18. 

Density of the matter is defined as

Answer : A. mass / volume

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