ECAT Pre Computer Science Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 9 Physical Optics

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

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ECAT Physics Chapter 9 Physical Optics

00:00
Question # 1

For the virtual image, option _______ is not correct:

Question # 2

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 3

Monochromatic light means waves of:

Question # 4

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

Question # 5

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

Question # 6

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 7

The contrast in the fringes in an interference pattern depends upon

Question # 8

Least distance of distinct vision of an old man possibly becomes:

Question # 9

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

Question # 10

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

Question # 11

The magnifier forms a virtual image of the object at:

Question # 12

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

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

The terms phase difference and path difference are:

Question # 15

Light appears to travel in straight line because

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum
3 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called
A. Diffraction
B. Interference
C. Polarization
D. Dispersion
4 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
5 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
6 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
7 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
8 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
9 Stars twinkle due to
A. The fact that they do not emit light continuously
B. The refractive index of earth's atmosphere fluctuates
C. The Star's atmosphere absorbs its light intermittently
D. None of these
10 The magnifier forms a virtual image of the object at:
A. None of these
B. Least distance of distinct vision
C. Much farther than the least distance
D. Both A and B are correct

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