Transfer Of Heat MCQ Preparation Test Punjab

Total Questions: 10

Total Marks: 10

Time: 10 Mins

Question # 1

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

Radiation only
Conduction, convection and radiation
Convection only
Conduction only

Question # 2

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

Question # 3

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 # 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

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?