Physics GK 17 – Heat & Heat Transmission

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Which among the following is true about conduction, convection and radiation mode of transfer of heat?

A Medium is required for conduction but not required for convection and radiation

A medium is required for conduction, convection and radiation

A medium is required for conduction and convection but not required for radiation

A medium is not required for conduction and convectio, radiation

Which among the following is true about latent heat ?

It causes change in temperature as well as change in state or phase

It causes change in temperature only

It causes change in state or phase but not in temperature

It causes change in Pressure

Steam at 100 degree centigrade causes more severe burns. Which of the following phenomena will you use to explain this?

Specific heat

Latent heat

Fusion

Fission

A small quantity of water is placed in a small cavity made in a block of Ice at 0 degree centigrade. Which of the following will happen?

the temperature of water will become zero and it will freeze

the temperature of water will become zero but it will not freeze

the temperature of the water will become zero and it will come out of the cavity

the temperature of the water will become zero and ice will melt to merge with water

Two pieces of ice at 0°C would freeze together if pressed against each other and then released. In this context, which among the following is the correct principle in action in this?

The melting point of pure ice decreases with pressure.

The melting point of pure ice increases with Pressure

The melting point of pure ice first increases, then decreases with pressure

The melting point of pure ice first decreases then increases with pressure

Physics GK 17 - Heat & Heat Transmission