Heat - Revision

In a vaccum flask the silvered walls reduce the heat transfer caused by -

• Radiation

• Convection

• Conduction

The normal body temperature of humans is -

• $37\degree F$

• $37\degree C$

• $39\degree C$

• $39\degree F$

During the night land breeze flows because -

• The sea cools faster.

• The land cools faster.

• Sea is empty and land is populated.

The S.I. Unit of temperature is -

• Kelvin

• Celsius

• Fahrenheit

The SI unit of Heat is

• Watt

• Calories

• Joules

A person calculated his body temperature to be 103^oF. What is the temperature in ^oC -

• 39.4

• 39.6

• 40.4

• 40.6

Why does mercury in the thermometer rises when its bulb comes in contact with hot object.

• Mercury is liquid at room temperature.

• Temperature increase causes expansion.

• Temperature increase causes contraction

• Mercury is a conductor of heat.

A pan kept on fire cools down after being removed from it. Why?

• The pan is a good conductor of heat.

• The pan is an insulator of heat.

• The heat is transferred to the surroundings.

• The above statement is incorrect - the pan stays hot.

How does heat travels in air -

• Conduction

• Convection

• Radiation

Transfer of heat in solids happen due to the phenomenon of -

• Conduction

• Convection

• Radiation