ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Question # 1

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 2

Stars twinkle due to

Question # 3

A ray passing through optical center of a lens, after refraction:

Question # 4

Electromagnetic waves transport:

Question # 5

The magnifier forms a virtual image of the object at:

Question # 6

Light waves are:

Question # 7

The velocity of light in vacuum can be changed by changing

Question # 8

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

Question # 9

The focal length of convex lens having magnifying power of 5.55 is:

Question # 10

The locus of all points in a medium having same phase of vibration is called

Question # 11

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

Question # 12

Monochromatic light means waves of:

Question # 13

The appearance of the colour in the soap (oil) film results from:

Question # 14

The contrast in the fringes in an interference pattern depends upon

Question # 15

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
2 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q
3 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
4 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
5 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
6 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
7 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
8 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
9 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
10 To sources are said to be coherent if they have:
A. Same amplitude
B. Same wavelength
C. Definite phase relation with each other
D. None of them

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