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

Stars twinkle due to

Question # 2

A prism splits a beam of white light into seven component colors. This is so because

Question # 3

The cause of mirage observed in deserts in bright sunlight is due to

Question # 4

To see the minor details of the object by microscope, it should have:

Question # 5

The least distance of distinct vision is:

Question # 6

With age, least distance of distinct vision:

Question # 7

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 8

Light waves are:

Question # 9

The size of the image is maximum when its distance from the magnifying glass is:

Question # 10

In the formula R = N x m for diffraction grating, N denotes:

Question # 11

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

Question # 12

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 13

The terms phase difference and path difference are:

Question # 14

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 15

Wave length of that color as compared to that of violet color is:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
2 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
3 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
4 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
5 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
6 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
7 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C
8 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
9 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
10 If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:
A. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm

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