### Mcq on radiation heat transfer (objective questions)

In this mechanical engineering lecture today we learned about heat  transfer subjects Mcq on radiation heat transfer (objective questions)

Guys this Radiation mcq is important for mechanical engineering student for all competitive exam.

Know without wasting time let's begin to start radiation mcqs ( objectives) questions with answers

# Mcq on radiation heat transfer (objective questions)

 Mcq on radiation heat transfer (objective questions)

Know we start mcq

1. Heat energy of sun is received by earth, by using the.........

A. Conduction
B. Convection
D. None of these
Ans - C

2. What emissivity of perfect black body?

A. 0
B. 1
C. 2
D. 3
Ans - B

3. A body at high temperature T °K radiates heat at rate proportion to........

A. T
B. T²
C. T³
D. T⁴
Ans - D

4. A black body which is temperature is 500° then that body emit energy is proportional to.........

A. 500
B. 500²
C. 500³
D. 500⁴
Ans - D

5. What emissivity of white body?

A. 0
B. 1
C. 2
D. 3
Ans - A

6. Which of the process is rapid process?

A. Conduction
B. Convection
D. None of these
Ans - C

7. What is Absorptive power of perfectly black body ?

A. Zero
B. One
C. Infinity
D. Constant
Ans - B

8. Krichhoff's law related to.......

A. Conduction
B. Convection
D. None of these
Ans - C

9. Heat transfer by radiation mainland depends on........

A. Nature of body
B. Its temperature
C. Surface of body
D. All of these
Ans - D

10. Opaque body is........

D. Some refelct and some absorbs
Ans - D

11. Ice is very closed to

A. Black body
B. White body
C. Gray body
D. Red body
Ans - A

A. Through vaccum
B. Through molecular momentum
C. Through any medium
D. None of these
Ans - A

13. What is the relation between absorptivity (à), transmissivity (T) and reflectivity (r) ,

A. r + à + T = 1
B. r + à - T = 1
C. r - à + T = 1
D. None of these
Ans - A

14. Radiation needs No medium for heat transfer.

A. True
B. False
Ans - A

15. At thermal equilibrium,  the emissivity and absorptivity are

A. Zero
B. Unity
C. Equal
D. Different
Ans - C

16. Maximum value of absorptivity is one.

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A. True
B. False
Ans - A

17. Which phenomena is related to radiation

A. Gravity
B. Electromagnetic phenomena
C. Magnetic phenomena
D. None of these
Ans - B

18. What is wavelength range of visible light?

A. 350 to 750 nanometer
B. 350 to 750 micrometer
C. 350 to 750 centimeters
D. 350 to 750 meters
Ans - A

In this mechanical engineering lecture today we learned about heat  transfer subjects Mcq on radiation heat transfer (objective questions).