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 10 of 21

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Q91.
A 100 W light bulb has a tungsten filament (emissivity = 0.30) which is required to operate at 2780 K. If the bulb is completely evacuated, calculate the minimum surface area of the tungsten filament

a.

0.98 * 10¯β΄ m²

b.

1.98 * 10¯β΄ m²

c.

2.98 * 10¯β΄ m²

d.

3.98 * 10¯β΄ m²

Discuss
Answer: (a).0.98 * 10¯β΄ m²
Q92.
For a hemisphere solid angle is measured as

a.

Radian and its maximum value is Ο€

b.

Degree and its maximum value is 180 degree

c.

Steradian and its maximum value is 2Ο€

d.

Steradian and its maximum value is Ο€

Discuss
Answer: (d).Steradian and its maximum value is Ο€
Q93.
A gray body (E = 0.8) emits the same amount of heat as a black body at 1075 K. Find out the required temperature of the gray body

a.

1146.72 K

b.

1136.72 K

c.

1126.72 K

d.

1116.72 K

Discuss
Answer: (b).1136.72 K
Q94.
The heat energy absorbed by a known area in a fixed time is determined with the help of an instrument called

a.

Psychrometer

b.

Pyrheliometer

c.

Thermometric well

d.

Any instrument

Discuss
Answer: (b).Pyrheliometer
Q95.
The value of solar constant varies between

a.

1123 and 1237 W/m²

b.

1345 and 1453 W/m²

c.

1987 and 2346 W/m²

d.

1335 and 1815 W/m²

Discuss
Answer: (d).1335 and 1815 W/m²
Q96.
The total amount of heat energy received by the sphere of radius r is

a.

2 Ο€ R² S

b.

6 Ο€ R² S

c.

4 Ο€ R² S

d.

Ο€ R² S

Discuss
Answer: (c).4 Ο€ R² S
Q97.
Amount of heat energy radiated by unit surface of the sun in the same time workout as
Take, R = mean distance of earth from the sun and r = radius of sun

a.

E = Ο€ R² S/4 Ο€ R²

b.

E = 4 Ο€ R² S/4 Ο€ R²

c.

E = 4 Ο€ R²

d.

E = 4 Ο€ R² S

Discuss
Answer: (b).E = 4 Ο€ R² S/4 Ο€ R²
Q98.
Temperature of sun can be workout from

a.

Wein’s displacement law

b.

Stefan-Boltzmann law

c.

Kirchhoff’s law

d.

All of the Mentioned

Discuss
Answer: (a).Wein’s displacement law
Q99.
The temperature of the photosphere, referred to as the effective temperature of the sun, is usually taken as

a.

3000 K

b.

4000 K

c.

5000 K

d.

6000 K

Discuss
Answer: (d).6000 K
Q100.
The approximate distribution of the flow of sun’s energy to the earth’s surface is

a.

53% is reflected back to space

b.

53% is transmitted to the earth

c.

9% is scattered

d.

22% is absorbed in the atmosphere

Discuss
Answer: (c).9% is scattered
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