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 statements is incorrect regarding Heat radiation?

a) Rough surfaces emit radiation more effectively than smooth ones

b) Highly polished, mirror-like surfaces are excellent radiators

c) Black surfaces absorb Heat better than white surfaces

d) Black surfaces radiate Heat more effectively than white surfaces

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A polished metal plate with a rough black patch on it is heated to about 1400 K and then placed in a dark room. What will be observed?

a) The black patch will glow brighter than the metal surface

b) The black patch will appear dimmer than the metal surface

c) Both the patch and the metal surface will appear equally bright

d) Neither the patch nor the surface will be visible

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Compared to a person with fair skin, a person with darker 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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Woollen clothes are preferred in winter because they:

a) Generate Heat

b) Absorb Heat from the surroundings

c) Are poor conductors of heat

d) Continuously supply heat to the body

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A hot object emits the maximum amount of radiant energy when 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 coated differently, heated to the same temperature, and placed in a vacuum. Which one will cool down the fastest?

a) Shiny white surface

b) Shiny black surface

c) Rough black surface

d) Rough white surface

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Which of the following best represents an ideal black body in laboratory conditions?

a) A piece of charcoal heated to a high temperature

b) A glass surface coated with tar

c) A metal surface painted black

d) A hollow enclosure with a small hole and blackened interior

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The total radiant energy emitted by a perfect black body is proportional to:

a) The absolute temperature

b) The fourth root of absolute temperature

c) The fourth power of absolute temperature

d) The square of absolute temperature

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Two thermometers, A and B, are exposed to sunlight. The bulb of thermometer A is blackened, while that of B is not. Which statement is correct?

a) Thermometer B heats up faster

b) Thermometer A always shows a higher temperature than B

c) Both thermometers show the same rise from the start

d) Thermometer A heats up faster, but both reach the same final temperature

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Tea pots are often made highly polished in order to:

a) Allow porcelain to shine better

b) Reflect external thermal radiation

c) Improve their appearance

d) Absorb all incoming radiation

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The principle stating that a good absorber of heat is also a good emitter is known as:

a) Stefan’s law

b) Kirchhoff’s law

c) Planck’s law

d) Wien’s law

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According to Kirchhoff’s law, a good absorber of heat must also be a:

a) Poor radiator

b) Poor conductor

c) Good conductor

d) Good radiator

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Materials that absorb heat efficiently are generally:

a) Poor emitters

b) Non-emitters

c) Good emitters

d) Highly polished surfaces

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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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