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Heat & Mass Transfer MCQ - Multiple Choice Question and Answer

Heat & Mass Transfer MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 8
The transfer of heat by molecular collision is smallest in

Solids
Liquids
Gases
None of these

Question No : 9
Thermal diffusivity is a

Function of temperature
Physical property of a substance
Dimensionless parameter
All of these

Question No : 10
The radiation emitted by a black body is known as

Black radiation
Full radiation
Total radiation
All of these

Question No : 11
Unit of thermal conductivity in M.K.S. units is

K cal/kg m² °C
K cal m/hr m² °C
K cal/hr m² °C
K calm/hr °C

Question No : 12
Which of the following property of air does not increase with rise in temperature?

Thermal conductivity
Thermal diffusivity
Density
Dynamic viscosity

Question No : 13
The amount of radiation mainly depends upon the

Nature of the body
Temperature of the body
Type of surface of the body
All of these

Question No : 14
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

1 : 1
2 : 1
1 : 2
4 : 1