Pakistan MCQs

Conduction transfers thermal energy through particle interactions.
It is especially important in solids.

Convection occurs when warmer fluid moves and cooler fluid replaces it.
It happens in liquids and gases.

Thermal radiation travels as electromagnetic waves.
It does not require a material medium.

Space between the Sun and Earth is nearly a vacuum.
Solar energy reaches Earth as electromagnetic radiation.

Wood and many plastics conduct heat poorly.
They reduce heat transfer to the user's hand.

Metals transfer heat efficiently from the flame to food.
This makes cooking faster and more even.

Both spoons may have the same temperature.
Metal removes heat from the skin more quickly, creating a colder sensation.

Heat flows from a hotter body to a cooler body.
It is energy in transit rather than a material substance.

Temperature indicates how energetic particle motion is on average.
It determines the direction of heat flow.

Spontaneous heat transfer occurs from higher to lower temperature.
It continues until thermal equilibrium is approached.

Kinetic energy is the energy of motion.
It depends on the object's mass and speed.

The fan's motor converts electrical energy into rotation.
Some energy is also lost as heat and sound.