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Mechanical Engineering Exam  >  Mechanical Engineering Test  >  Heat Transfer  >  Test: Wien’s Displacement Law - Mechanical Engineering MCQ

Wien’s Displacement Law - Free MCQ Practice Test with solutions, GATE ME


MCQ Practice Test & Solutions: Test: Wien’s Displacement Law (10 Questions)

You can prepare effectively for Mechanical Engineering Heat Transfer with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Wien’s Displacement Law". These 10 questions have been designed by the experts with the latest curriculum of Mechanical Engineering 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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Test: Wien’s Displacement Law - Question 1
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The relationship (Wavelength) MAX T = constant, between the temperature of a black body and the wavelength at which maximum value of monochromatic emissive power occurs is known as

Detailed Solution: Question 1

This is the Wien’s law. From the spectral distribution of black body emissive power, it is apparent that the wavelength associated with maximum rate of emission depends up on the absolute temperature of the radiating surface.

Test: Wien’s Displacement Law - Question 2
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A body at 500 K cools by radiating heat to ambient atmosphere maintained at 300 K. When the body has cooled to 400 K, the cooling rate as a percentage of original rate is about

Detailed Solution: Question 2

Q2/Q1 = (400)4 – (300)4/ (500)4 – (300)4 = 0.32.

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Test: Wien’s Displacement Law - Question 3
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Two spheres A and B of same material have radius 1 m and 4 m, and temperatures 4000 K and 2000 K respectively. Then the energy radiated by sphere A is

Detailed Solution: Question 3

E A/E B = (1)2 (4000)4/ (4)2 (2000)4 = 1.

Test: Wien’s Displacement Law - Question 4
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A small body has a total emissive power of 4.5 kW/m2. Determine its surface temperature of maximum emission

Detailed Solution: Question 4

E = σ T4. So, T = 530.77 K.

Test: Wien’s Displacement Law - Question 5
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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?

Detailed Solution: Question 5

(Wavelength) T = 2.8908 * 10-3. This must be the wavelength of infrared region.

Test: Wien’s Displacement Law - Question 6
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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

Detailed Solution: Question 6

T = 2.8908 * 10 -3/0.52 * 10 -6 = 5573 K.

Test: Wien’s Displacement Law - Question 7
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Consider the previous problem, determine the maximum monochromatic emissive power of the sun’s surface

Detailed Solution: Question 7

(E) MAX = 1.285 * 10-5T5 = 6.908 * 1013 W/m2.

Test: Wien’s Displacement Law - Question 8
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A furnace emits radiation at 2000 K. Treating it as a black body radiation, calculate the wavelength at which emission is maximum

Detailed Solution: Question 8

(Wavelength) T = 2.8908 * 10 -3. So, wavelength = 1.449 * 10 -6 m.

Test: Wien’s Displacement Law - Question 9
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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?

Detailed Solution: Question 9

The emissivity of black paint is highest i.e. unity. Consequently, the emitted radiant energy will be maximum when painted black.

Test: Wien’s Displacement Law - Question 10
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A surface for which emissivity is constant at all temperatures and throughout the entire range of wavelength is called

Detailed Solution: Question 10

Foe grey surface, emissivity is constant. Grey surface radiates much more because of constant wavelength throughout its entire surface.

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About this Mechanical Engineering Practice Test

This test contains 10 MCQs on Wien’s Displacement Law with detailed solutions for each question. It is part of the Heat Transfer course on EduRev, designed to align with the current Mechanical Engineering syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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