Heat Test - 8...

The scale of temperature on which temperature is only positive is

Mercury thermometers can be used to measure temperature up to

Pyrometer is an instrument used to measure

A metal plate has a circular hole cut in it. If the plate is heated to a higher temperature, the diameter of the hole will

Expansion during heating

A beaker is filled upto brim with water at 4°C. The temperature is increased by a few °C above 4°C and further, it is decreased by few °C below 4°C. What will we observe?

The high thermal conductivity of metal is due to free electrons. The related electron property is

Ventilators are provided at the top of rooms

The temperature of a body is increased from 27°C to 127°C. The radiation emitted by it increases by a factor of

In a room, where the temperature is 30°C, a body cools from 61°C to 59°C in 4 minutes. The time taken by the body to cool from 51°C to 49°C will be

1 kg of hot water at 76^oC is poured into a calorimeter containing 0.50 kg of water at 14^oC. If the temperature of the mixture is 54^oC, what is the thermal capacity of the calorimeter?

If 420 J of energy is supplied to 10 g of water, it will raise its temperature by nearly

The ratio of densities of two bodies is 5 : 6 and their specific heats are in the ratio 3 : 5. The ratio of their thermal capacities per unit volume is

Latent heat of fusion of any body

One gram of ice at 0⁰ C is mixed with 1 g of steam at 100⁰ C. Latent heat of fusion of water is 80 cal/g and latent heat of vaporisation is 536 cal/g. After thermal equilibrium is achieved, the temperature of the mixture is

A block of ice at - 10°C is slowly heated and converted to steam at 100°C. Which of the following curves represents this phenomenon qualitatively?

The efficiency of a heat engine can never be

Conversion of heat into electrical energy can be achieved by

Vapour pressure of a liquid depends upon

If water at 0^oC, kept in a container with an open top, is placed in a large evacuated chamber,