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

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

Question # 2

For the virtual image, option _______ is not correct:

Question # 3

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

Question # 4

Electromagnetic waves transport:

Question # 5

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

Question # 6

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 7

The magnifier forms a virtual image of the object at:

Question # 8

The locus of all points in a medium having same phase of vibration is called

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

The contrast in the fringes in an interference pattern depends upon

Question # 13

Stars twinkle due to

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
2 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
3 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
4 If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:
A. Double the size
B. Same size
C. Half the size
D. None of these
5 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
6 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
7 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
8 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
9 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
10 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these

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