ECAT Pre General Science Chapter 10 online mcq test with answers for Physics chapter 10 (Optical Instruments)

Question # 1

In case of destructive interference of two waves, the amplitude of the resultant wave will be __________ either of the waves.

Greater than A
Smaller than B
Equal to C
None of these D

Question # 2

Angle between ray of light and the corresponding wavefront is

0⁰ A
60⁰ B
90⁰ C
120⁰ D

Question # 3

The appearance of colours in the soap (or oil) film results from

Dispersion A
Interference B
Reflection C
Refraction D

Question # 4

Huygen's principle states that

Light travels in straight line A
Light has dual nature B
Either of these C
None of these D

Question # 5

To observe interference of light, the condition, which must be met with is that the sources must be

Monochromatic A
Phase coherent B
Both of above C
None of above D

Question # 6

When the source of light is at very large distance, the shape of wavefront is

Spherical A
Cylindrical B
Plane C
None of these D

Question # 7

Wavelength of light, on the average, is given by

10^-14m A
10^-10m B
10^-6m C
10^-4m D

Question # 8

The property of light which does not change with the nature of the medium is

Frequency A
Amplitude B
Wavelength C
None of these D

Question # 9

In an interference pattern of Young's Double Slit (YDS) experiment

Bright fringes are wider than dark fringes A
Dark fringes are wider than bright fringes B
Both dark and bright fringes are of equal width C
Central fringes are wider than the outer fringes D

Question # 10

Wavelength of red colour as compared to that of violet colour is

Smaller A
Longer B
Equal C
None of these D

Question # 11

Laws of reflection and refraction can also be explained by

Particle nature of light A
Quantum nature of light B
Wave nature of light C
Complex nature of light D

Question # 12

Frequency of red colour as compared to that of violet colour is

Equal A
Smaller B
Greater C
None of these D

Question # 13

Which one of the followings can act approximately as a source of monochromatic light

Neon lamp A
Fluorescent tube B
Sodium lamp C
None of these D

Question # 14

Light waves are

Transverse waves A
Longitudinal waves B
Compressional C
None of them wave D

Question # 15

In case of constructive interference of two waves, the amplitude of the resultant wave is __________ either of the waves

Greater than A
Equal to B
Smaller than C
None of these D

Question # 16

Monochromatic light means wave of

Same frequency A
Same colour B
Same Wavelength C
All of them D

Question # 17

The wave nature of light was proposed by

Newton A
Thomas Young B
Huygen C
None of these D

Question # 18

Light has

Wave nature A
Dual nature B
Particle nature C
None of them D

Question # 19

In YDS experiment, fringe spacing means the distance between two consecutive _________ fringes

Bright A
Dark B
Any of A or B C
None of these D

Question # 20

Electromagnetic waves transport

Energy only A
Momentum only B
Both A and B C
None is correct D

Question # 21

Huygen principle is used to determine

Speed of light A
Location of wavefront B
About polarized and unpolarized light C
None of them D

Question # 22

A line which represents the direction of travel of a wave is known as

Spherical wavefront A
Locus B
Ray C
Either B or C D

Question # 23

In case of point source of light, shape of wavefront is

Spherical A
Cylindrical B
Plane C
None of above D

Question # 24

Two sources are said to be coherent if they have

Same amplitude A
Same wavelength B
Definite phase relation with each other C
None of them D

Question # 25

The terms phase difference and path difference are

Same A
Different B
Equal C
none of these D

Question # 26

Speed of light in vacuum depends upon

Frequency A
Wavelength B
Amplitude C
None of these D

Question # 27

The locus of all the points in the same phase of vibration is called

Wave pocket A
Wavefront B
Wave number C
None of these D

Question # 28

The appearance of colours in the soap (or oil) film results from

Dispersion A
Interference B
Reflection C
Refraction D

Question # 29

Light waves are

Mechanical waves A
Electromagnetic waves B
Any of above C
None of above D

Question # 30

The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself

Equal to A
Greater than B
Smaller than C
None of these D

Sr.#	Question	Answer
1	To observe interference of light, the condition, which must be met with is that the sources must be	A. Monochromatic B. Phase coherent C. Both of above D. None of above
2	The appearance of colours in the soap (or oil) film results from	A. Dispersion B. Interference C. Reflection D. Refraction
3	The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself	A. Equal to B. Greater than C. Smaller than D. None of these
4	In case of destructive interference of two waves, the amplitude of the resultant wave will be __________ either of the waves.	A. Greater than B. Smaller than C. Equal to D. None of these
5	In case of constructive interference of two waves, the amplitude of the resultant wave is __________ either of the waves	A. Greater than B. Equal to C. Smaller than D. None of these
6	The locus of all the points in the same phase of vibration is called	A. Wave pocket B. Wavefront C. Wave number D. None of these
7	Huygen principle is used to determine	A. Speed of light B. Location of wavefront C. About polarized and unpolarized light D. None of them
8	Light has	A. Wave nature B. Dual nature C. Particle nature D. None of them
9	Wavelength of red colour as compared to that of violet colour is	A. Smaller B. Longer C. Equal D. None of these
10	Angle between ray of light and the corresponding wavefront is	A. 0⁰ B. 60⁰ C. 90⁰ D. 120⁰

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ECAT Pre General Science Physics Chapter 10 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 10 Optical Instruments

ECAT Pre General Science Physics Chapter 10 Optical Instruments

In case of destructive interference of two waves, the amplitude of the resultant wave will be __________ either of the waves.

Angle between ray of light and the corresponding wavefront is

The appearance of colours in the soap (or oil) film results from

Huygen's principle states that

To observe interference of light, the condition, which must be met with is that the sources must be

When the source of light is at very large distance, the shape of wavefront is

Wavelength of light, on the average, is given by

The property of light which does not change with the nature of the medium is

In an interference pattern of Young's Double Slit (YDS) experiment

Wavelength of red colour as compared to that of violet colour is

Laws of reflection and refraction can also be explained by

Frequency of red colour as compared to that of violet colour is

Which one of the followings can act approximately as a source of monochromatic light

Light waves are

In case of constructive interference of two waves, the amplitude of the resultant wave is __________ either of the waves

Monochromatic light means wave of

The wave nature of light was proposed by

Light has

In YDS experiment, fringe spacing means the distance between two consecutive _________ fringes

Electromagnetic waves transport

Huygen principle is used to determine

A line which represents the direction of travel of a wave is known as

In case of point source of light, shape of wavefront is

Two sources are said to be coherent if they have

The terms phase difference and path difference are

Speed of light in vacuum depends upon

The locus of all the points in the same phase of vibration is called

The appearance of colours in the soap (or oil) film results from

Light waves are

The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself

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