Heat Test - 9...

Oxygen boils at – 183°C. This temperature is approximately

The freezing point on a thermometer is marked as 20° and the boiling point as 150°. A temperature of 60°C on this thermometer will be read as

The study of physical phenomena at low temperature (below liquid nitrogen) is called

Gaps are kept between railway tracks because

During severe winter in low temperature zones of the world, the superficial parts of the lakes are frozen leaving water below. The freezing at the bottom is prevented because

When water is heated from 0°C, its volume

If we touch a piece of copper and another piece of glass at 40^oC, then copper will feel hotter because

The radiating power of a body depends on

If the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor of

A ball A has twice the diameter as another ball B of the same material and with same surface finish. If both A and B balls are heated to the same temperature, and allowed to cool by emitting radiations, then

Water is used in hot water bottles because

The water equivalent of a body is 10 g. Its thermal capacity is

A liquid of mass m and specific heat c is heated to a temperature T. Another liquid of mass (m/2) and specific heat 2c is heated to a temperature 2T. If these two liquids are mixed, the resulting temperature of the mixture will be

During severe winter, water in a lake starts freezing ___

During melting process, heat given to a body is utilized in

One gram of ice at 0°C is converted into steam at 100°C. The amount of heat required to do so is(Latent heat of fusion of ice = 80 cal/ g)

A horizontal cylinder has two sections of unequal cross-sections, in which two pistons can move freely. The pistons are joined by a string. A gas is trapped between the pistons. If this gas is heated, the pistons will

Which device can convert electrical energy into heat?

The boiling point of water can be raised by

Sprinkling of water reduces the temperature of a closed room because