Class 7 heat

Temperature of boiling water cannot be measured by a (a)   thermometer

The hotness of an object is detetmined by its (a)  

Temperature is measured in degree (a)   .

Clothes of (a)   colours absorb heat better than clothes of light colours.

A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of (a)  

No medium is required for transfer of heat by the process of (a)   .

One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be:

• 80°C

• More than 50°C but less than 80°C

• 20°C

• Between 30°C and 50°C

An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will

• flow from iron ball to water.

• not flow from iron ball to water or from water to iron ball.

• flow from water to iron ball.

• increase the temperature of both.

Stainless steel pans are usually provided with copper bottoms. The reason for this could be that

• copper bottom makes the pan more durable

• such pans appear colourful

• copper is a better conductor of heat than the stainless steel

• copper is easier to clean than the stainless steel

A wooden spoon is dipped in a cup of ice-cream. Its other end

• becomes cold by the process of conduction

• becomes cold by the process of convection

• becomes cold by the process of radiation

• does not become cold