Wave Optics Test

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Wave Optics Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

The symbol represents

A
frequency

B
amplitude

C
resonance

D
wavelength

Solution

The distance between successive crests of a wave, especially points in a sound wave or an electromagnetic wave, is called wavelength. It is represented by the symbol,``.
Question 2
1 / -0

Light appears to travel in straight lines since

A
it is not absorbed by the atmosphere

B
it is reflected by the atmosphere

C
its wavelength is very small

D
its velocity is very large
Question 3
1 / -0

The velocity of light is maximum in

A
diamond

B
water

C
vacuum

D
glass
Question 4
1 / -0

The resolving power of a telescope depends upon the

A
length of the telescope

B
focal length of the objective

C
aperture of the object

D
focal length of the eye piece
Question 5
1 / -0

Which of the following phenomena is not common to light and sound waves?

A
Interference

B
Diffraction

C
Coherence

D
Polarisation
Question 6
1 / -0

Which of the following radiations has the longest wavelength?

A
Blue light

B
Y-rays

C
X-rays

D
Red light
Question 7
1 / -0

Which of the following cannot be polarised?

A
Microwaves

B
X - rays

C
Gamma rays

D
Sound waves
Question 8
1 / -0

Which one of the following phenomena is not explained by Huygen`s construction of wavefront?

A
Refraction

B
Reflection

C
Diffraction

D
Origin of spectra
Question 9
1 / -0

Two slits in Young's interference experiment have widhts in the ratio 1 : 25.What is the ratio of intensity at the maxima and minima in interference pattern?

A
9:4

B
6:5

C
9:8

D
4:2
Question 10
1 / -0

A thin transparent sheet is placed in front of Young`s double slit. The fringe width will

A
increases

B
decreases

C
remain same

D
become non - uniform
Question 11
1 / -0

If yellow light emitted by sodium lamp in Young`s double slit experiment is replaced by monochromatic blue light of the same intensity the

A
fringe width will decrease

B
fringe width will increase

C
fringe width will remain unchanged

D
none of these

Solution

Fringe width

As the wavelength decreases, fringe width decreases.
Question 12
1 / -0

A Young`s double slit experiment is performed with white light. Which of the following statements is wrong?

A
The central fringe will be white.

B
There will not be a completely dark fringe.

C
The fringe next to the central will be red.

D
The fringe next to the central will be violet.
Question 13
1 / -0

Which of the following statements is not correct?

A
When unpolarised light is passed through a Nicol`s prism, the emergent light is elliptically polarised.

B
Nicol`s prism works on the principles of double refraction and total internal reflection.

C
Nicol`s prism can be used to produce and analyse polarised light.

D
None of these
Question 14
1 / -0

A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5. The wavelength of refracted light will

A
dependent on intensity of refracted light

B
be the same

C
be smaller

D
be larger
Question 15
1 / -0

For a telescope, larger the diameter of objective

A
smaller is the resolving power

B
greater is the magnifying power

C
smaller is the magnifying power

D
greater is the resolving power
Question 16
1 / -0

The difference between light wave and sound wave is

A
light waves in air are transverse while sound waves in air are longitudinal

B
light waves in air are longitudinal while sound waves in air are transverse

C
light wave in air are transverse or longitudinal but sound waves in air are longitudinal

D
None of these
Question 17
1 / -0

In Huygen`s wave theory, the locus of all points in the same state of vibration is called

A
a half period zone

B
vibrator

C
a wavefront

D
a ray
Question 18
1 / -0

The intensity of electromagnetic radiation depends upon

A
amplitude only

B
frequency only

C
both amplitude and frequency

D
neither amplitude nor frequency
Question 19
1 / -0

Which of the following characters of light shows interference and diffraction?

A
Transverse nature

B
Wave nature

C
Rectilinear propagation

D
Quantized nature of light
Question 20
1 / -0

Interference takes place due to the change in

A
phase difference

B
amplitude

C
velocity

D
intensity
Question 21
1 / -0

In Young`s double slit experiment, if two slightly different wavelengths are present in the light used, then

A
there will no fringes at all

B
the central fringe will be white

C
the sharpness of the fringes will decrease as we move away from central fringe

D
None of these
Question 22
1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

Two waves of same wavelength and amplitude interfere to give a minimum, when phase difference is

A
0

B
π / 2

C
π

D
3 π / 2
Question 23
1 / -0

In films beautiful colours are obtained due to

A
diffraction

B
scattering

C
dispersion

D
interference
Question 24
1 / -0

In Young`s double slit experiment, the central bright fringe can be identified

A
as it has greater intensity than the other bright fringe

B
as it is wider than the other bright fringe

C
as it is narrower than the other bright fringes

D
by using white light instead of monochromatic light
Question 25
1 / -0

In Young`s double slit experiment, if the slits are of unequal width

A
fringes will not be formed

B
the position of minimum intensity will not be completely dark

C
bright fringes will not be formed at the center of the screen

D
None of these
Question 26
1 / -0

Who discovered neutron?

A
Chadwick

B
Newton

C
Khurana

D
None of these

Solution

James Chadwick discovered the neutron in 1932.
Question 27
1 / -0

Which of the following does not change, when a photon enters into glass from air?

A
Momentum

B
Velocity

C
Wavelength

D
Energy
Question 28
1 / -0

Which of the following is not a property of light?

A
It can travel through vacuum.

B
It requires a material medium for propagation.

C
It involves transportation of energy.

D
It has a finite speed.

Solution

Electromagnetic waves do not require a medium to propagate. Light is an electromagnetic wave.
Question 29
1 / -0

A tuning fork of unknown frequency when sounded with another of 256 Hz gives 4 beats/sec.When a tuning fork loaded with a certain wax it is found to give 2 beats.What is the unknown frequency?

A
260

B
300

C
456

D
500
Question 30
1 / -0

In vacuum, the speed of light depends upon

A
wavelength

B
colour

C
frequency

D
None of these

Solution

The velocity of light in vacuum does not depend on frequency or wavelength. According to the theory of relativity, velocity of light is constant in a non-inertial frame of reference. The velocity of light does not depend on anything.

So, the correct option is 4.

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Wave Optics Test - 4

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Wave Optics Test - 4

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SHARING IS CARING

Question 1

frequency

amplitude

resonance

wavelength

Solution

Question 2

it is not absorbed by the atmosphere

it is reflected by the atmosphere

its wavelength is very small

its velocity is very large

Question 3

diamond

water

vacuum

glass

Question 4

length of the telescope

focal length of the objective

aperture of the object

focal length of the eye piece

Question 5

Interference

Diffraction

Coherence

Polarisation

Question 6

Blue light

Y-rays

X-rays

Red light

Question 7

Microwaves

X - rays

Gamma rays

Sound waves

Question 8

Refraction

Reflection

Diffraction

Origin of spectra

Question 9

9:4

6:5

9:8

4:2

Question 10

increases

decreases

remain same

become non - uniform

Question 11

fringe width will decrease

fringe width will increase

fringe width will remain unchanged

none of these

Solution

Question 12

The central fringe will be white.

There will not be a completely dark fringe.

The fringe next to the central will be red.

The fringe next to the central will be violet.

Question 13

When unpolarised light is passed through a Nicol`s prism, the emergent light is elliptically polarised.

Nicol`s prism works on the principles of double refraction and total internal reflection.

Nicol`s prism can be used to produce and analyse polarised light.

None of these

Question 14

dependent on intensity of refracted light

be the same

be smaller

be larger