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Physics MCQs for NEET — Practice Questions with Answers

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Two coherent sources of light can be obtained by

Two different lamps

Two different lamps but of the same power

Two different lamps of the same power and having the same colour

None of the above

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Explanation

The coherent source cannot be obtained from two different light sources.

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By Huygen's wave theory of light, we cannot explain the phenomenon of

Interference

Diffraction

Photoelectric effect

Polarisation

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Explanation

Huygen's wave theory fails to explain the particle nature of light (i.e. photoelectric effect)

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Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are

5I and I

5I and 3I

9I and I

9I and 3I

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Explanation

$I_{\max} = {(\sqrt{I_{1}} + \sqrt{I_{2}})}^{2} = {(\sqrt{I} + \sqrt{4 I})}^{2} = 9 I$

$I_{\min} = {(\sqrt{I_{1}} - \sqrt{I_{2}})}^{2} = {(\sqrt{I} - \sqrt{4 I})}^{2} = I$

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If L is the coherence length and c the velocity of light, the coherent time is

$\frac{L}{c}$

$\frac{c}{L}$

$\frac{1}{L c}$

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Explanation

Coherent time $= \frac{C o h e r e n c e l e n g t h}{V e l o c i t y o f l i g h t} = \frac{L}{c}$

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If the amplitude ratio of two sources producing interference is 3 : 5, the ratio of intensities at maxima and minima is

25 : 16

5 : 3

16 : 1

25 : 9

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Explanation

$\frac{a_{1}}{a_{2}} = \frac{3}{5}$

$∴ \frac{I_{\max}}{I_{\min}} = \frac{{(a_{1} + a_{2})}^{2}}{{(a_{1} - a_{2})}^{2}} = \frac{{(3 + 5)}^{2}}{{(3 - 5)}^{2}} = \frac{16}{1}$

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For constructive interference to take place between two monochromatic light waves of wavelength λ, the path difference should be

$(2 n - 1) \frac{λ}{4}$

$(2 n - 1) \frac{λ}{2}$

$n λ$

$(2 n + 1) \frac{λ}{2}$

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Explanation

For constructive interference path difference is even multiple of $\frac{λ}{2}$ .

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Soap bubble appears coloured due to the phenomenon of

Interference

Diffraction

Dispersion

Reflection

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Explanation

Phenomenon of interference of light takes place.

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Which of the following statements indicates that light waves are transverse

Light waves can travel in vacuum

Light waves show interference

Light waves can be polarized

Light waves can be diffracted

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Explanation

Transverse waves can be polarised.

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Interference was observed in interference chamber when the air was present, now the chamber is evacuated and if the same light is used, a careful observer will see

No interference

Interference with bright bands

Interference with dark bands

Interference in which width of the fringe will be slightly increased

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Explanation

The refractive index of air is slightly more than 1. When chamber is evacuated, refractive index decreases and hence the wavelength increases and fringe width also increases.

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Ray diverging from a point source forms a wave front that is -

Cylindrical

Spherical

Plane

Cubical

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Explanation

A point source emits light in all directions. The wavefronts formed by the rays diverging from a point source are spherical. This is because the distance traveled by each ray from the source is the same, forming a spherical wavefront.

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