Physics - Study Mode

[#966] Outside of cooking utensils are generally left black from below because
Correct Answer

(D) Black surface is a good absorber of heat.

Explanation

Solution: The outside surface of a utensil used for heating is coated black so that it may absorb more heat and make heating quicker. This is because black surface is a good absorber of heat.

[#967] Heat transfer by radiation mainly depends upon
Correct Answer

(D) All of the above

Explanation

Solution: Heat transfer by radiation depends upon all of the above.

[#968] A white and smooth surface is
Correct Answer

(B) Bad absorber and good reflector of heat

Explanation

Solution: A white and smooth surface is bad absorber and good reflector of heat.

[#969] The atmosphere is heated mainly by
Correct Answer

(C) Radiation

Explanation

Solution: It is evident that the atmosphere is primarily heated from below by radiation from the heated Earth surface.

[#970] The direction of heat flow between two objects depends on
Correct Answer

(C) Their temperatures

Explanation

Solution: The direction of heat flow between two objects depends on their temperatures. Heat always flows from a body at higher temperature to a body at a lower temperature.