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 8 of 21

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Q71.
A small black body has a total emissive power of 4.5 k W/m². In which range of the spectrum does this wavelength fall?

a.

Thermal region

b.

Cosmic region

c.

Visible region

d.

Infrared region

Discuss
Answer: (d).Infrared region
Q72.
The sun emits maximum radiation of 0.52 micron meter. Assuming the sun to be a black body, Calculate the surface temperature of the sun

a.

2345 K

b.

5573 K

c.

9847 K

d.

6492 K

Discuss
Answer: (b).5573 K
Q73.
A furnace emits radiation at 2000 K. Treating it as a black body radiation, calculate the wavelength at which emission is maximum

a.

1.449 * 10¯⁶ m

b.

2.449 * 10¯⁶ m

c.

3.449 * 10¯⁶ m

d.

4.449 * 10¯⁶ m

Discuss
Answer: (a).1.449 * 10¯⁶ m
Q74.
Four identical pieces of copper painted with different colors of paints were heated to the same temperature and then left in the environment to cool. Which of the following paint will give fast cooling?

a.

White

b.

Rough

c.

Black

d.

Shining

Discuss
Answer: (c).Black
Q75.
A surface for which emissivity is constant at all temperatures and throughout the entire range of wavelength is called

a.

Opaque

b.

Grey

c.

Specular

d.

Diathermanous

Discuss
Answer: (b).Grey
Q76.
If radiant energy EB emitted by the black surface strikes the non-black surface. If non-black surface has absorptivity α, it will absorb how much radiations?

a.

α EB

b.

2 α EB

c.

3 α EB

d.

4 α EB

Discuss
Answer: (a).α EB
Q77.
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 – α EB = 0

b.

2 E – α EB = 0

c.

E – α EB = 0

d.

½ E – α EB = 0

Discuss
Answer: (c).E – α EB = 0
Q78.
The absorptivity of black body equals to

a.

2

b.

1

c.

3

d.

4

Discuss
Answer: (b).1
Q79.
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
Q80.
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
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