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# Test: Transfer of Heat by Radiation

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## 20 Questions MCQ Test Physics Class 11 | Test: Transfer of Heat by Radiation

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Test: Transfer of Heat by Radiation - Question 1

### Which of the given phenomenon is not related to convection?

Detailed Solution for Test: Transfer of Heat by Radiation - Question 1

Convection is the movement of surrounding medium according to density by which transfer of heat takes place. Whereas in option A it tells about the transfer of heat due to molecules inside conductor, which is conduction.

Test: Transfer of Heat by Radiation - Question 2

### Which is the fastest mode of heat transfer?

Detailed Solution for Test: Transfer of Heat by Radiation - Question 2

Radiation is the fastest mode of transfer of heat, because radiation travels at the speed of light, which is very quick. The slowest mode of transfer of heat is conduction because it takes place from particle to particle.

Test: Transfer of Heat by Radiation - Question 3

### The heat of sun comes to us through:

Detailed Solution for Test: Transfer of Heat by Radiation - Question 3

The sun heats the earth through radiation. Since there is no medium (like the gas in our atmosphere) in space, radiation is the primary way that heat travels in space. When the heat reaches the earth it warms the molecules of the atmosphere, and they warm other molecules and so on.

Test: Transfer of Heat by Radiation - Question 4

What should be the temperature of black body to emit radiant energy which is independent of the conditions in the surroundings?

Detailed Solution for Test: Transfer of Heat by Radiation - Question 4

Temperature of black body should be more than zero. Obvious answer. If the temperature is not greater than 0 then there will be no radiation.

Test: Transfer of Heat by Radiation - Question 5

According to the Stefan-Boltzmann law of thermal radiation for a perfect radiator, the rate of radiant energy per unit area is proportional to

Detailed Solution for Test: Transfer of Heat by Radiation - Question 5

The rate of loss of heat by a body is directly proportional to its excess temperature over that of the surroundings provided that this excess is small.

Test: Transfer of Heat by Radiation - Question 6

SI unit of thermal conductivity is

Detailed Solution for Test: Transfer of Heat by Radiation - Question 6

K = power × thickness (m) ÷ area × ∆T
K = (J s-1) (m) ÷ (m2) (K)
K = J m-1 s-1 k-1

Test: Transfer of Heat by Radiation - Question 7

The mechanism of transfer of heat between two adjacent parts of a body because of their temperature difference is known as

Detailed Solution for Test: Transfer of Heat by Radiation - Question 7

The mechanism of transfer of heat between two adjacent parts of a body because of their temperature difference is known as conduction. This is the definition of conduction.

Test: Transfer of Heat by Radiation - Question 8

The temperature range upto which Newton’s law of cooling holds good

Detailed Solution for Test: Transfer of Heat by Radiation - Question 8

Newton’s law of cooling is to be used at temperatures around room temperature.

Test: Transfer of Heat by Radiation - Question 9

Newton’s law of cooling states that the rate of cooling of a body is proportional to the _____________________.

Detailed Solution for Test: Transfer of Heat by Radiation - Question 9

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.

Test: Transfer of Heat by Radiation - Question 10

Value of coefficient of thermal coefficient is:

Detailed Solution for Test: Transfer of Heat by Radiation - Question 10

Conductors have free electrons in them whereas insulators don’t have any. Therefore, conductors conduct heat and electricity better than insulators. Therefore the value of thermal coefficient is good in case of conductors and less in case in insulators.

Test: Transfer of Heat by Radiation - Question 11

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

Detailed Solution for Test: Transfer of Heat by Radiation - Question 11

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.

Test: Transfer of Heat by Radiation - Question 12

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

Detailed Solution for Test: Transfer of Heat by Radiation - Question 12

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

Test: Transfer of Heat by Radiation - Question 13

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

Detailed Solution for Test: Transfer of Heat by Radiation - Question 13

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

Test: Transfer of Heat by Radiation - Question 14

What is the coefficient of thermal conductivity K?

Test: Transfer of Heat by Radiation - Question 15

Mercury is a liquid which is heated by:

Detailed Solution for Test: Transfer of Heat by Radiation - Question 15

Hg expands on heat (thermometers) it acts as a good conducting metal.

Test: Transfer of Heat by Radiation - Question 16

What are units of K?

Detailed Solution for Test: Transfer of Heat by Radiation - Question 16

K is the heat transfer coefficient. [] means units
[Q/t] = W, [A] = L2, [d] = L, [T] = K

Test: Transfer of Heat by Radiation - Question 17

Rate of conduction of heat depends on:

Detailed Solution for Test: Transfer of Heat by Radiation - Question 17

The rate is given as dQ/dt = KAdT/dx

Test: Transfer of Heat by Radiation - Question 18

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

Detailed Solution for Test: Transfer of Heat by Radiation - Question 18

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.

Test: Transfer of Heat by Radiation - Question 19

Which of the relation is true for the heat current?

Detailed Solution for Test: Transfer of Heat by Radiation - Question 19

H = dQ/dt = KAdT/dx

Test: Transfer of Heat by Radiation - Question 20

What is the expression for temperature gradient?

Detailed Solution for Test: Transfer of Heat by Radiation - Question 20

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

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