# Chapter 7: Transfer of Heat Physics Mcqs for High School - Grade 9 - Set 3

1)   The substances through which heat does not conduct easily are called

b. good conductors
c. good convections

2)   The rate of emission of radiation depends on

a. color and texture of surface
b. surface temperature
c. surface area
d. all of above
 Answer  Explanation ANSWER: all of above Explanation: No explanation is available for this question!

3)   The movement of cold air from the land towards the sea is called

a. wind energy
b. planetary wind
c. land breeze
d. sea breeze
 Answer  Explanation ANSWER: land breeze Explanation: No explanation is available for this question!

4)   In home utensils such as handles of sauce-pans, spoons, hot-plates etc. we use

a. plasma
b. good conductors
d. mercury

5)   White and polished surface reflects more heat than

a. black surface only
b. rough surface only
c. polished surface
d. black and rough surface
 Answer  Explanation ANSWER: black and rough surface Explanation: No explanation is available for this question!

6)   The surface which absorbs more heat is

a. black and rough
b. white and rough
c. red and rough
d. pink and rough
 Answer  Explanation ANSWER: black and rough Explanation: No explanation is available for this question!

7)   Thermal conductivity of air is

a. 0.026 Wm-1 K-1
b. 0.75 Wm-1 K-1
c. 0.59 Wm-1 K-1
d. 1.58 Wm-1 K-1
 Answer  Explanation ANSWER: 0.026 Wm-1 K-1 Explanation: No explanation is available for this question!

8)   If the cross sectional area is larger, the rate of flow of heat will be

a. zero
b. constant
c. smaller
d. greater
 Answer  Explanation ANSWER: greater Explanation: No explanation is available for this question!

9)   The heat flow rate depends on

a. cross sectional area of solid
b. length of solid
c. temperature difference between ends
d. all of above
 Answer  Explanation ANSWER: all of above Explanation: No explanation is available for this question!

10)   Eagles fly without flapping their wings due to

a. air currents