The length of a metal rod at 0°C is 0.5m. When it is heated, its length increases by 2.7 mm. The final temperature of the rod is (coefficient of linear expansion of the metal = 90 x 10^-6/°C) _______.

(a)

20°C

(b)

30°C

(c)

40°C

(d)

60°C

A bimetal made of copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated, it will ___________.

(a)

remain straight

(b)

bend towards right

(c)

bend towards left

(d)

bend forward

When water is heated from 0^oC to 0^oC, its volume ________.

(a)

decreases

(b)

increases

(c)

first increase and then decrease

(d)

first decreases and then increases

A block of wood is floating on water at 0^oC with a certain volume V above water level. The temperature of water is slowly raised to 20^oC. How does the volume V change with the rise of temperature?

(a)

remain unchanged

(b)

decrease continuously

(c)

decrease till 4°C and then increase

(d)

increase till 4°C and then decrease

An iron tyre is to be fitted on a wooden wheel 0.1 in diameter. The diameter of the tyre is 6 mm smaller than that of the wheel. The tyre should be heated by a temperature of (coefficient of volume expansion of iron is 3.6\(\times\)10^-5/°C) ________

(a)

167°C

(b)

334°C

(c)

500^oC

(d)

1000^oC