Transfer Of Heat MCQ Preparation Test Sindh

Total Questions: 10

Total Marks: 10

Time: 10 Mins

Question # 1

How does the process of heat transfer through convection occur in gases?

Through downward motion of molecules
Through free movement of molecules
Through upward motion of molecules
Through random motion of molecules

Question # 2

How heat reaches us from the Sun?

Through radiation only
Through convection and radiation
Through convection only
Through conduction only

Question # 3

An electrical heater is placed in a beaker of cold oil as shown in image, then the heater is switched on. What happens to the liquid at X?

It becomes less dense and falls
It becomes more dense and falls
It becomes less dense and rises
It becomes more dense and rises

Question # 4

Which of the following statements is false about green house effect?

Increased emission of green house gases in the atmosphere increases Earth's temperature
Increased emission of green house gases is a natural process
Life on earth is possible due to green house effect
None of these

Question # 5

The amount of heat absorbed by a body depends upon the

Colour of its surface
Nature of its surface
Both A and B
none of these

Question # 6

How is heat transferred in gases?

None of these
Through radiation
Through conduction
Through convection

Question # 7

Water at the top of a hot-water tank is heated and the water becomes hot. No water enters or leaves the tank. Water at the bottom of the tank stays cold for some time. What is the reason behind this?

Hot water at the bottom of the tank rises to the top
The insulation is a poor conductor of heat
Water is a poor conductor of heat
Cold water at the top of the tank falls to the bottom

On heating, the hot and less dense water remains at the top and no convection current occurs.

Question # 8

Why conduction of heat doesn\'t take place in gases?

Particles are fixed at their positions
None of these
Particles are very near to each other
Particles are far apart from each other

Question # 9

Density changes are responsible for which method of thermal energy transfer?

Radiation only
Conduction, convection and radiation
Convection only
Conduction only

Question # 10

Which of the following factors effect the rate of transfer of energy in radiation?

Surface area
All of these
Surface temperature
Color and texture of the surface

Transfer Of Heat MCQ Tests

Physics

Physics

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