Physics - Study Mode

[#761] The word ''insolation' means
Correct Answer

(B) Incoming solar radiation

Explanation

Solution: The word ''insolation' means incoming solar radiation.

[#762] Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
Correct Answer

(C) Decreases slightly

Explanation

Solution: Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water decreases slightly.

[#763] Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in
Correct Answer

(B) Convection

Explanation

Solution: Heat is transferred in the liquid and gases from a region of higher temperature to a region of lower temperature. Convection heat transfer occurs partly due to the actual movement of molecules or due to the mass transfer.

[#764] Energy travels from Sun to Earth through
Correct Answer

(C) Radiation

Explanation

Solution: Energy travels from Sun to Earth through radiation.

[#765] Which best describes how air moves during convection?
Correct Answer

(A) Cool air falls down

Explanation

Solution: In convection, hot air rises from the Earth's surface and becomes cold at higher altitude because of lower temperature there. As it cools, it sinks down to the surface of the Earth. On reaching Earth, it warms again and rises up again. The main reason for this phenomenon is - sinking cold air pushes the warm air up.