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

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

Question # 2

The contrast in the fringes in an interference pattern depends upon

Question # 3

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

Question # 4

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

Question # 5

A convex lens acts as diverging lens when the object is placed:

Question # 6

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

Question # 7

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 # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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 # 14

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

Question # 15

A virtual image is formed when object is placed:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
2 Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these
3 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
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 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
6 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
7 The contrast in the fringes in an interference pattern depends upon
A. Fringe width
B. Relative difference intensities of the two sources
C. Distance between the slits
D. Wavelength
8 The cause of mirage observed in deserts in bright sunlight is due to
A. Refraction of light
B. Reflection of light
C. Scattering of light
D. Total internal reflection of light
9 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
10 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm

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