Kirchhoff Law in Hindi

Kirchhoff Law in Hindi. We covered all the Kirchhoff Law in Hindi in this post for free so that you can practice well for the exam.

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Mock Test on Kirchhoff Law for Students

Which of the following statement is wrong?

(A) Rough surfaces are better radiators than smooth surface

(B) Highly polished mirror like surfaces are very good radiators

(C) Black surfaces are better absorbers than white ones

(D) Black surfaces are better radiators than white ones

Show Answer

A polished metal with rough black spot on it is heated to about 1400 K and quickly taken to a dark room. Which one of the following statement will be true?

(A) The spot will appear brighter than the plate

(B) The spot will appear darker than the plate

(C) The spot and plate will be equally bright

(D) The spot and plate will not be visible in dark

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As compared to a person with white skin another person with dark skin, will experience :

(A) Less heat and more cold

(B) More heat and more cold

(C) More heat and less cold

(D) Less heat and less cold

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Woolen clothes are used in winter season because woolen clothes :

(A) Are good sources for producing heat

(B) Absorb heat from surroundings

(C) Are bad conductors of heat

(D) Provide heat to body continuously

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A hot body will radiate maximum energy if its surface is :

(A) White and polished

(B) Black and polished

(C) White and rough

(D) Black and rough

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Four identical copper cylinders are painted, if they are all heated to the same temperature and left in vacuum which will cool most rapidly?

(A) Painted shiny white

(B) Painted shiny black

(C) Painted rough black

(D) Painted rough white

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The best laboratory approximation to an ideal black body is :

(A) A lump of charcoal heated to a high temperature

(B) A glass surface coated with coaltar

(C) A metal coated with a black dye

(D) A hollow enclosure blackened inside with shoot and have a small hole

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The total radiation emitted by a perfectly black body is proportional to :

(A) Temperature on ideal gas scale

(B) Fourth root of temperature on ideal gas scale

(C) Fourth power of temperature on ideal gas scale

(D) Square of temperature on ideal gas scale

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Two thermometers A and B are exposed to sunlight. The valve of A is painted black but that of B is not painted. The correct statement regarding this case is :

(A) Temperature of B will rise faster

(B) Temperature of A will remain more than B

(C) Both of A and B show equal rise from the beginning

(D) Temperature of A will rise faster than B but the final temperature will be same in both

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Tea pots are highly polished :

(A) Because procleain takes high polish

(B) So that they may reflect rays from outside

(C) To make them attractive to look at

(D) So that they may absorb all radiation from outside

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A good absorber of heat is a good radiator of heat also is :

(A) Stefan's law

(B) Kirchhoff's law

(C) Planck's law

(D) Wien's law

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The essence of Kirchhoff's law is that good absorber must be a :

(A) Bad radiator

(B) Bad conductor

(C) Good conductor

(D) Good radiator

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Good absorbers of heat are :

(A) Poor emitters

(B) Non- emitters

(C) Good emitters

(D) Highly polished

Show Answer

We covered all the kirchhoff law in hindi above in this post for free so that you can practice well for the exam.

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