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

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Question # 1

If the object is situated at focus of a convex lens, then its image is formed at:

Question # 2

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

Question # 3

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

Question # 4

The terms phase difference and path difference are:

Question # 5

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 # 6

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 7

The property of light which does not change with the nature of the medium is:

Question # 8

Conventionally, all the distance p, q, f are measured from _____ of the lens:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Huygen's theory cannot explain

Question # 13

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

Question # 14

Wave length of light, on the average, is given by:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
2 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
3 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
4 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
5 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:
A. 5 cm
B. 10 cm
C. 20 cm
D. 25 cm
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. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm
7 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
8 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
9 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
10 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

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