Question 1

A substance above critical temperature exists as

Accepted Answer

A) Solid 
B) Liquid 
C) Wet vapour 
D) Gas 
E) Dry vapour 
A) Solid 
B) Liquid 
C) Wet vapour 
D) Gas 
E) Dry vapour

Question 2

Two bodies one hot and the other cold are kept in vacuum. What will happen to the temperature of the hot body after sometime?

Accepted Answer

A) Increases due to convection 
B) Remains the same 
C) Decreases due to convection 
D) Increases due to radiation 
E) Decreases due to radiation 
A) Increases due to convection 
B) Remains the same 
C) Decreases due to convection 
D) Increases due to radiation 
E) Decreases due to radiation

Question 3

The emissive power of a body depends on

Accepted Answer

A) Nature of body 
B) Temperature of body 
C) Physical nature 
D) All of the above 
E) None of the above 
A) Nature of body 
B) Temperature of body 
C) Physical nature 
D) All of the above 
E) None of the above

Question 4

DBA = DAB, in case of

Accepted Answer

A) Stagnet diffusion 
B) Equimolar counter diffusion 
C) Either of (
A)  and (
B)  above 
D) None of the above 
E) 2.6 cm2/sec 
A) Stagnet diffusion 
B) Equimolar counter diffusion 
C) Either of (
A)  and (
B)  above 
D) None of the above 
E) 2.6 cm2/sec

Question 5

Elongation of a rod when heated

Accepted Answer

A) Is proportional to original length 
B) Is proportional to length 
C) Is inversely proportional to linear strain 
D) Is inversely proportional to original length 
E) Does not depend on its length 
A) Is proportional to original length 
B) Is proportional to length 
C) Is inversely proportional to linear strain 
D) Is inversely proportional to original length 
E) Does not depend on its length

Question 6

There metal walls of same cross-sectional area having thermal conductivity in the ratio 1 : 2 : 4 transfer heat at the rate of 15000 kcal/hr. For same thickness of wall, the temperature deop will be in the ratio

Accepted Answer

A) 1 ; 2 ; 4 
B) 1 : 
C) 4 ; 2 ; 1 
D) 1 ; 1 ; 1 
A) 1 ; 2 ; 4 
B) 1 : 
C) 4 ; 2 ; 1 
D) 1 ; 1 ; 1

Question 7

Longest wavelength

Accepted Answer

A) Ultraviolet rays 
B) Infrared rays 
C) Gamma rays 
D) X-rays 
E) Radio waves 
A) Ultraviolet rays 
B) Infrared rays 
C) Gamma rays 
D) X-rays 
E) Radio waves

Question 8

If thermal conductivity of aluminium is say 100 units at 0°C, the thermal conductivity at 500°C will be closer to

Accepted Answer

A) 37,500 kg 
B) 100 units 
C) 20 units 
D) 140 units 
E) 50 units 
A) 37,500 kg 
B) 100 units 
C) 20 units 
D) 140 units 
E) 50 units

Question 9

The highest value of thermal conductivity is expected for

Accepted Answer

A) Solid ice 
B) Water 
C) Melting ice 
D) Steam 
E) Boiling water 
A) Solid ice 
B) Water 
C) Melting ice 
D) Steam 
E) Boiling water

Question 10

A wall has two layers A and B, each made of a different material. Both the layers have the same thickness. The thermal conductivity of material of A is twice that of B. Under the thermal equilibrium the temperature difference across the wall is 30°C. The temperature drops in layers A and B will be respectively

Accepted Answer

A) 15°C and 15°C 
B) cannot be predicated 
C) 37,500 kg 
D) 10°C and 2 0°C 
E) 20°C and 10°C 
A) 15°C and 15°C 
B) cannot be predicated 
C) 37,500 kg 
D) 10°C and 2 0°C 
E) 20°C and 10°C

A substance above critical temperature exists as

Two bodies one hot and the other cold are kept in vacuum. What will happen to the temperature of the hot body after sometime?

The emissive power of a body depends on

DBA = DAB, in case of

Elongation of a rod when heated

There metal walls of same cross-sectional area having thermal conductivity in the ratio 1 : 2 : 4 transfer heat at the rate of 15000 kcal/hr. For same thickness of wall, the temperature deop will be in the ratio

Longest wavelength

If thermal conductivity of aluminium is say 100 units at 0°C, the thermal conductivity at 500°C will be closer to

The highest value of thermal conductivity is expected for

Thermal Conductivity and Heat Transfer

Heat Transfer and Thermal Conductivity: Part A

Heat Transfer and Thermal Conductivity: Part B

Heat Transfer and Thermal Conductivity: Part C

Heat Transfer and Evaporator

Heat Transfer and Heat Exchangers: Part A

Heat Transfer and Heat Exchangers: Part B

Heat Transfer and Crystallisation

Heat Transfer and Thermal Properties: Part A

Heat Transfer and Thermal Properties: Part B

Heat Exchangers and Condensation

Thermal Properties and Processes

Concepts in Heat Transfer

Heat Transfer and Thermodynamics

Heat Transfer Processes, Thermometers, and Evaporators

Heat Transfer and Thermal Properties: Part A

Heat Transfer Mechanisms in a Spaced Plate System

Heat Transfer and Evaporation

Understanding the Dominant Mechanism of Heat Transfer

Heat Transfer and Fluid Mechanics

Heat Transfer and Boiling Point Elevation in Solutions

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Exam 14: Components of Radiation From Flames

A substance above critical temperature exists as

Two bodies one hot and the other cold are kept in vacuum. What will happen to the temperature of the hot body after sometime?

The emissive power of a body depends on

DBA = DAB, in case of

Elongation of a rod when heated

There metal walls of same cross-sectional area having thermal conductivity in the ratio 1 : 2 : 4 transfer heat at the rate of 15000 kcal/hr. For same thickness of wall, the temperature deop will be in the ratio

Longest wavelength

If thermal conductivity of aluminium is say 100 units at 0°C, the thermal conductivity at 500°C will be closer to

The highest value of thermal conductivity is expected for

Thermal Conductivity and Heat Transfer

Heat Transfer and Thermal Conductivity: Part A

Heat Transfer and Thermal Conductivity: Part B

Heat Transfer and Thermal Conductivity: Part C

Heat Transfer and Evaporator

Heat Transfer and Heat Exchangers: Part A

Heat Transfer and Heat Exchangers: Part B

Heat Transfer and Crystallisation

Heat Transfer and Thermal Properties: Part A

Heat Transfer and Thermal Properties: Part B

Heat Exchangers and Condensation

Thermal Properties and Processes

Concepts in Heat Transfer

Heat Transfer and Thermodynamics

Heat Transfer Processes, Thermometers, and Evaporators

Heat Transfer and Thermal Properties: Part A

Heat Transfer Mechanisms in a Spaced Plate System

Heat Transfer and Evaporation

Understanding the Dominant Mechanism of Heat Transfer

Heat Transfer and Fluid Mechanics

Heat Transfer and Boiling Point Elevation in Solutions

Filters