Heat Radiation MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Heat Radiation, a fundamental topic in the field of Heat Transfer. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Heat Radiation MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Heat Radiation mcq questions that explore various aspects of Heat Radiation problems. Each MCQ is crafted to challenge your understanding of Heat Radiation principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Heat Transfer tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Heat Radiation MCQs are your pathway to success in mastering this essential Heat Transfer topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Heat Radiation. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Heat Radiation knowledge to the test? Let's get started with our carefully curated MCQs!

Heat Radiation MCQs | Page 12 of 21

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Q111.
If radiant energy EB emitted by the black surface strikes the non-black surface. If non-black surface has absorptivity Ξ±, it will absorb how much radiations?

a.

Ξ± EB

b.

2 Ξ± EB

c.

3 Ξ± EB

d.

4 Ξ± EB

Discuss
Answer: (a).Ξ± EB
Q112.
If two surfaces are at the same temperature, then the conditions correspond to mobile thermal equilibrium for which the resultant interchange of heat is zero are

a.

3 E – Ξ± EB = 0

b.

2 E – Ξ± EB = 0

c.

E – Ξ± EB = 0

d.

½ E – Ξ± EB = 0

Discuss
Answer: (c).E – Ξ± EB = 0
Q113.
The absorptivity of black body equals to

a.

2

b.

1

c.

3

d.

4

Discuss
Answer: (b).1
Q114.
A diathermanous body

a.

Shines as a result of incident radiation

b.

Gets heated up a result of absorption of incident radiation

c.

Allows all the incident radiation to pass through it

d.

Partly absorbs and partly reflects the incident radiation

Discuss
Answer: (c).Allows all the incident radiation to pass through it
Q115.
Choose the false statement

a.

Snow is nearly black to thermal radiation

b.

Absorption of radiation occurs in a very thin layer of material n ear the surface

c.

Transmissivity varies with wavelength of incident radiation

d.

Most of the engineering materials have rough surfaces, and these rough surfaces give regular (specular) reflections

Discuss
Answer: (d).Most of the engineering materials have rough surfaces, and these rough surfaces give regular (specular) reflections
Q116.
The emissivity and the absorptivity of a real surface are equal for radiation with identical temperature and wavelength. This law is referred to as

a.

Kirchhoff’s law

b.

Lambert’s law

c.

Planck’s law

d.

Wein’s displacement law

Discuss
Answer: (a).Kirchhoff’s law
Q117.
With an increase in wavelength, the monochromatic emissive power of a black body

a.

Increases

b.

Decreases

c.

Decreases, reaches a minimum and then increases

d.

Increases, reaches a maximum and then decreases

Discuss
Answer: (d).Increases, reaches a maximum and then decreases
Q118.
The temperature of a solid surface changes from 27 K to 627 K. The emissive power changes would then confirm to the ratio

a.

6:1

b.

9:1

c.

81:1

d.

27:1

Discuss
Answer: (c).81:1
Q119.
If the temperature of a hot body is increased by 50%, the amount of radiations emitted by it would increase by nearly

a.

200%

b.

500%

c.

50%

d.

100%

Discuss
Answer: (b).500%
Q120.
Consider two bodies, one absolutely back and the other non-black and let these be at same temperature. Which one of the following statement is correct?

a.

Black body radiates less intensively than a non-black body

b.

Non-black body radiates less intensively than a black body

c.

Both will radiates equally

d.

None of them will radiates

Discuss
Answer: (b).Non-black body radiates less intensively than a black body
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