Thermodynamics

A marble tile would feel cold as compared to a wooden tile on a winter morning. Because the marble tile

• Is a better conductor of heat than the wooden tile.

• Is polished while wooden tile is not polished.

• Reflects more heat than wooden tile.

• Is a poor conductor of heat the wooden tile.

What is the name of the following statement: “When two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other”?

• First Law of Thermodynamics

• Second Law of Thermodynamics

• Mechanical equivalent of heat

• Zeroth Law of Thermodynamics

A silver tea spoon is placed in a cup filled with hot tea. After some time, the exposed end of the spoon becomes hot even without a direct contact with the liquid. This phenomenon can be explained by:

• Conduction

• Convection

• Radiation

• Emission

Some iron has a coefficient of linear expansion of 12 × 10−6 K−1. A 100 mm length of iron piping is heated through 20 K. The pipe extends by:

• 0.24 mm

• 0.024 mm

• 2.4 mm

• 0.0024 mm

An aluminum plate has a circular hole. If the temperature of the plate increases, what happens to the size of the hole?

• Increases

• Decreases

• Stays the same

• Increases the top half of the hole