Question # 1

Sodium chloride in a flame gives

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Green light

White light

Red light

Yellow light

Bright fringes are also called as

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Minima

Maxima

Wave front

Ray of light

Fringe spacing in Young's double slit experiment increases due to increase in.

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Slit separation

Wave length

Order of Fringe

Frequency of source

Michelson's interferometer can be used ot find the

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Velocity of light

Wavelength of light

Velocity of sound

Wavelength of sound

Which phenomenon of light proves that light waves are transverse in nature.

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Refraction

Reflection

Diffraction

Polarization

In case of point source the shape of wave front is.

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Plane

spherical

Circular

Eliptical

The Bragg's equation is given by

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The blue colour of sky is due to

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diffraction

Reflection

Polarization

Scattering

In young's double slit experiment for the interference the central region will be

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Dark

Bright

Coloured

None of these

Dark fringes are also called as

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Minima

Maxima

Wave front

Ray of light

the locus of all pint in the same wave of vibration is called.

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Wave front

Diffraction

Interference

Polarization

Standard metal according to Michelson's interferometer is equivalent to

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1553163.5 wave meter

3 x 108meter

15503000 meter

None of these

In blue light is used as compare to red light then fringe spacing.

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Increase

Decreases

Remain same

Becomes zero

According to Huygen's principle the points on primary wave front can be considered as

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Secondary wavelets

Ray of light

Source of light

None of these

The distinguish between transverse and longitudinal wave_______ is used.

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Refraction

Interference

Diffraction

polarization

If 'N' is number of lines rule don the grating having length 'L' then grating element 'd' is given by.

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N/L

2N/L

L/N

N/2L

Light waves emitted from a source spread in

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Specific direction

All direction

Upward direction

None of these

The centre of Newton's fringe is dark due to.

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Destructive interference

Diffraction

Constructive interference

Polarization

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Physics Fsc Part 1 Chapter 9 Online Test MCQs With Answers

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