Interference and Diffraction MCQ Multiple Choice Questions - Page 6 for Practice

Q: 76. The Radius (or diameter) of dark rings in Newtons rings is

Correct Answer is: Directly proportional to the square root of natural numbers

Q: 77. The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called

Correct Answer is: Ultra-Violet

Q: 78. The speed of any mechanical wave as it propagates through a medium is dependent mainly on the

Correct Answer is: type of medium through which the wave travels

Q: 82. To find prominent diffraction, the size of diffraction object should be

Correct Answer is: comparable to order of wavelength of light

Q: 83. Two sources of light are said to be coherent if

Correct Answer is: they produce waves of the same amplitude

Q: 84. What is the effect of increasing the number of slits on the intensity of Central maxima of diffraction pattern of a diffraction grating?

Correct Answer is: Intensity of central maxima will increase

Q: 88. What is the nature of interference pattern for thin film of wedge shaped

Correct Answer is: Convex outside

Q: 89. What is the nature of interference pattern for thin film of wedge shaped

Correct Answer is: Convex outside

Interference and Diffraction MCQ Questions for Practice

76. The Radius (or diameter) of dark rings in Newtons rings is

Directly proportional to the square root of odd numbers
Inversely proportional to the square root of natural numbers
Directly proportional to the square root of even numbers
Directly proportional to the square root of natural numbers

77. The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called

IR
Ultra-Violet
RF
Gamma ray

78. The speed of any mechanical wave as it propagates through a medium is dependent mainly on the

frequency of the wave source
wavelength
period of the wave
type of medium through which the wave travels

79. The speed of light in material A is 1.25 times as large as it is in material. What is the ratio of the refractive indices, µA /µB of these materials?

1.5
1
0.8
1.25

80. The wave nature of light is demonstrated by which of the following?

The photoelectric effect
Color
The speed of light
Diffraction

81. There are two types of diffraction Fresnel and ..........

Michelson
De Broglie
Fraunhofer
Huygens

82. To find prominent diffraction, the size of diffraction object should be

greater than wavelength of light used
comparable to order of wavelength of light
less than wavelength of light used
none of these

83. Two sources of light are said to be coherent if

they produce waves of the same wave length
they have the same amplitude of vibration
they produce waves in the medium simultaneously
they produce waves of the same amplitude

84. What is the effect of increasing the number of slits on the intensity of Central maxima of diffraction pattern of a diffraction grating?

Intensity of central maxima will decrease
Intensity of central maxima will increase
There will not be any effect
Diffraction pattern will disappear

85. What is the highest order spectrum which may be seen with monochromatic light of wavelength 5000 A^o by means of diffraction grating with 5000 lines/cm?

86. What is the name of the process whereby waves travel around corners and obstacles in their paths?

Reflection
Refraction
Interference
Diffraction

87. What is the nature of interference pattern at the contact edge of wedge shaped film

Always bright
Always dark
Bright or dark depending upon the thickness of other end
Bright or dark depending upon the wavelength of the light

88. What is the nature of interference pattern for thin film of wedge shaped

Concave outside
Convex outside
Equally spaced
Concave inside

89. What is the nature of interference pattern for thin film of wedge shaped

Concave outside
Convex outside
Equally spaced
Concave inside

90. What is the speed of light in glycerin (n = 1.47) expressed in terms of the speed of light in a vacuum?

2.04c
1.47c
0.680c
1.00c