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

00:00
Question # 1

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

Question # 2

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

Question # 3

The ratio of the size of the image to that of object is called:

Question # 4

The magnifier forms a virtual image of the object at:

Question # 5

The image of the tip of a needle is never sharp because of

Question # 6

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

Question # 7

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

Question # 8

The least distance of distinct vision is:

Question # 9

A magnifier gives an image which is:

Question # 10

Electromagnetic waves transport:

Question # 11

The contrast in the fringes in an interference pattern depends upon

Question # 12

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:

Question # 13

Angle between the ray of light and the corresponding wavefront is:

Question # 14

Laws of reflection and refraction can also be explained by:

Question # 15

Resolving power in mth order diffraction for grating is given by:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
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 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
4 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. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm
5 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
6 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
7 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
8 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
9 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
10 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller

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