Test: Heat & Temperature - UPSC MCQ

Ice is not a heat source; it is a substance that can absorb heat and undergo phase change to become water or vapor.

The Kelvin is the SI unit of temperature. It is an absolute temperature scale where 0 Kelvin represents absolute zero, the lowest possible temperature.

Conduction is the transfer of heat through direct contact between particles. It can occur in solids, liquids, and gases.

Evaporation is the process of converting a liquid into its vapor at a temperature below its boiling point. It occurs at the surface of the liquid.

Copper is a good conductor of heat. It allows heat to transfer quickly through its particles due to the free movement of electrons.

When an object is heated, its particles gain energy and move more vigorously, causing an increase in volume.

Specific heat capacity is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

The zeroth law of thermodynamics states that if two objects are in thermal equilibrium with a third object, they are in thermal equilibrium with each other.

Temperature is a measure of the average kinetic energy of the particles in a substance. It determines the direction of heat flow.

Absolute zero is the temperature at which the volume of an ideal gas would theoretically become zero. It is -273.15 degrees Celsius.

Melting is the process of changing from a solid to a liquid state. It involves a change in state, not a change in temperature.

Convection is the transfer of heat through the movement of fluids (liquids or gases). It involves the actual movement of the fluid particles.

Evaporation is responsible for the cooling effect experienced when we sweat. It is the process of liquid turning into vapor.

Water has the highest specific heat capacity among the given materials. It requires more heat to raise its temperature compared to other substances.

The boiling point of water at standard atmospheric pressure is 100 degrees Celsius.

All substances expand when heated and contract when cooled. This phenomenon is known as thermal expansion.

Radiation is the transfer of heat through the emission and absorption of electromagnetic waves. It does not require a medium for transfer.

The specific heat capacity of a substance depends on its temperature. It determines the amount of heat required to change its temperature.

Sublimation is the process of conversion of a solid directly into a gas without passing through the liquid state. Examples include dry ice (solid carbon dioxide) turning into carbon dioxide gas.

The rate of heat transfer through conduction is affected by temperature difference, surface area, and the material of the objects involved.