Transfer of Heat by Radiation Test

Result

Transfer of Heat by Radiation Test - 2

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Question 1
4 / -1

Among the following methods of heat transfer, gravity does not play any part in

A
Convection

B
Radiation and conduction

C
radiation

D
convection and conduction

Solution

Gravity does not play any part in radiation and conduction because in both these processes heat is transferred without any motion of the medium particles.
Question 2
4 / -1

The process by which heat is transferred from one place to another without heating the intervening medium is known as

A
convection

B
radiation

C
sublimation

D
fusion

Solution

Radiation alludes to the mechanism in which heat is transmitted without any physical contact between objects. It uses electromagnetic waves for transfer of heat.
Question 3
4 / -1

The process by which heat flows from the region of higher temperature to the region of lower temperature by actual movement of material particles is called

A
Sublimation

B
radiaton

C
Conduction

D
Convection

Solution

In this process, heat is transferred in the liquid and gases from a region of higher temperature to a region of lower temperature. Convection heat transfer occurs partly due to the actual movement of molecules or due to the mass transfer
Question 4
4 / -1

Mercury is a liquid which is heated by:

A
Convection

B
Radiation

C
Conduction

D
transfusion

Solution

Hg expands on heat (thermometers) it acts as a good conducting metal.
Question 5
4 / -1

What are units of K?

A
Wm^-2K^-1

B
WmK

C
Wm^-1K^-1

D
Wm^-1K^-2

Solution

K is the heat transfer coefficient.

[] means units
[Q/t] = W, [A] = L², [d] = L, [T] = K
Question 6
4 / -1

Rate of conduction of heat depends on:

A
Area of cross section

B
Temperature difference

C
Properties of Material

D
All of these

Solution

The rate is given as dQ/dt = KAdT/dx
Question 7
4 / -1

Which of the given relation is true for Newton’s law of cooling?

A

B

C

D

Solution

Newton's law of cooling states that the heat released by a body with respect to time (or) the rate of heat released is directly proportional to the difference between the body's temperature and the surrounding temperature.
dH/dt = k(T – Ts) where t = surrounding's temperature and T = temperature of the body
Consider two bodies A and B, of equal surface areas, such that A's temperature is more that B's temperature and the surrounding temperature is less than both A and B. Then according to Newton's law of cooling A loses more heat to the surroundings when compared B during the same time interval. So, A will cool faster than B.
Question 8
4 / -1

Which of the relation is true for the heat current?

A

B

C

D

Solution

H = dQ/dt = KAdT/dx
Question 9
4 / -1

What is the expression for temperature gradient?

A

B

C

D

Solution

A temperature gradient is a physical quantity that describes in which direction and at what rate the temperature changes the most rapidly around a particular location.
The temperature gradient is a dimensional quantity expressed in units of degrees per unit length.
The SI unit is kelvin per meter.
Expression: ∆T/∆x, where ∆T = change in temperature and ∆x = change in distance