Chapter 7: Transfer of Heat Physics Mcqs for High School - Grade 9 - Set 5

1)   Central heating systems in buildings work on the principle of

a. convection
b. radiation
c. conduction
d. all of above
Answer  Explanation 

ANSWER: convection

Explanation:
No explanation is available for this question!


2)   The good conductors of heat is

a. water
b. wool
c. rubber
d. metal
Answer  Explanation 

ANSWER: metal

Explanation:
No explanation is available for this question!


3)   The process in which heat is transferred in form of waves is called

a. Conduction
b. convection
c. thermal climbing
d. radiation
Answer  Explanation 

ANSWER: radiation

Explanation:
No explanation is available for this question!


4)   Central heating system in buildings work on the principle of

a. convection
b. fusion
c. radiation
d. conduction
Answer  Explanation 

ANSWER: convection

Explanation:
No explanation is available for this question!


5)   As compared to non-metals, heat reaches from the hot part to the cold parts of the metal objects

a. slowly
b. quickly
c. equal time
d. none of above
Answer  Explanation 

ANSWER: quickly

Explanation:
No explanation is available for this question!


6)   A metal box having four faces of different nature is called

a. Leslie triangle
b. Leslie hexagon
c. Leslie pentagon
d. Leslie cube
Answer  Explanation 

ANSWER: Leslie cube

Explanation:
No explanation is available for this question!


7)   The rising currents of hot air are called

a. air currents
b. thermals
c. radiation
d. layers
Answer  Explanation 

ANSWER: thermals

Explanation:
No explanation is available for this question!


8)   Poor conductors of heat are

a. liquids only
b. gases only
c. metals
d. liquids and gases
Answer  Explanation 

ANSWER: liquids and gases

Explanation:
No explanation is available for this question!


9)   The mode of transfer of heat by vibrating atoms and free electrons in solids from hot to cold parts of a body is known as heat's

a. radiation
b. convection
c. conduction
d. fusion
Answer  Explanation 

ANSWER: conduction

Explanation:
No explanation is available for this question!


10)   The rate of heat flow is

a. directly proportional to length
b. inversely proportional to length
c. not related to length
d. none of above
Answer  Explanation 

ANSWER: directly proportional to length

Explanation:
No explanation is available for this question!


11)   The materials which trap air inside them are

a. bad conductors of heat
b. good conductors of heat
c. moderately conducts heat
d. transfer heat by convection
Answer  Explanation 

ANSWER: bad conductors of heat

Explanation:
No explanation is available for this question!


12)   When temperature of an object is higher than its surroundings then as compare to absorbing, it is radiating

a. more heat
b. less heat
c. equal heat
d. zero heat
Answer  Explanation 

ANSWER: more heat

Explanation:
No explanation is available for this question!