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Physics MCQs for NEET — Practice Questions with Answers

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Which of the following law states that “good absorbers of heat are good emitters” ?

Stefan’s law

Kirchoff’s law

Planck’s law

Wein’s law

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Explanation

(b) According to Kirchoff's law-

$\frac{e m i s s i v e p o w e r}{a b s o r p t i v e} = c o n s \tan t$

so for high emissive power, absorptive power should by high.

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According to Wein's law -

$λ_{m} T$ = constant

$\frac{λ_{m}}{T}$ = constant

$\frac{T}{λ_{m}}$ = constant

$T + λ_{m}$ = constant

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Explanation

(a) According to Wan's law-

$λ_{m} α \frac{1}{T} o r λ_{m} . T = co n s \tan t$

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On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that

The temperature of A is maximum, B is minimum and C is intermediate

The temperature of A is maximum, C is minimum and B is intermediate

The temperature of B is maximum, A is minimum and C is intermediate

The temperature of C is maximum, B is minimum and A is intermediate

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Explanation

$λ_{r} > λ_{y} > λ_{b} \Rightarrow T_{r} < T_{y} < T_{b} or T_{A} < T_{C} < T_{B}$

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The wavelength of radiation emitted by a body depends upon

The nature of its surface

The area of its surface

The temperature of its surface

All the above factors

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Explanation

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Colour of shining bright star is an indication of its

Distance from the earth

Size

Temperature

Mass

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Explanation

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A black body at 200 K is found to exit maximum energy at a wavelength of $14 μm$ . When its temperature is raised to 1000K, the wavelength at which maximum energy is emitted is

$14 μm$

$70 μF$

$2.8 μm$

$2.8 nm$

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Explanation

(c) $λ_{m 1} T_{1} = λ_{m 2} T_{2} \Rightarrow λ_{m 2} = \frac{λ_{m 1} T_{1}}{T_{2}} = \frac{14 \times 200}{1000} = 2.8 μm$

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If the temperature of the sun becomes twice its present temperature, then

Radiated energy would be predominantly in infrared

Radiated energy would be predominantly in ultraviolet

Radiated energy would be predominantly in X-ray region

Radiated energy would become twice the present radiated energy

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Explanation

(b) The wavelength corresponding to maximum emission of radiation from the sun is $λ_{\max} = 4753 \overset{0}{A}$ (close to the wavelength of violet colour of visible region). Hence if temperature is doubled $λ_{m}$ is decreased $(λ_{m} \propto \frac{1}{T})$ i.e. mostly ultraviolet radiations emits.

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The maximum energy in the thermal radiation from a hot source occurs at a wavelength of $11 \times 10^{- 5}$ cm. According to Wein's law, the temperature of the source (on Kelvin scale) will be n times the temperature of another source (on Kelvin scale) for which the wavelength at maximum energy is $5.5 \times 10^{- 5}$ cm. The value n is

$\frac{1}{2}$

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Explanation

(c) $\frac{T_{1}}{T_{2}} = \frac{λ_{m 2}}{λ_{m 1}} = \frac{5.5 \times 10^{5}}{11 \times 10^{5}} = \frac{1}{2} \Rightarrow n = \frac{1}{2}$

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How is the temperature of stars determined by ?

Stefan’s law

Wein’s displacement law

Kirchhoff’s law

Ohm’s law

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Explanation

(b) The temperature of stars is determined by using the wavelength of light coming from them in Wan's displacement law.

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On increasing the temperature of a substance gradually, which of the following colours will be noticed by you ?

White

Yellow

Green

Red

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Explanation

(a)

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Yes. You can attempt every Physics question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.