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

When a source of light isat very large distance,the shape of wavefront is:

Question # 2

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

Question # 3

In an interference pattern of Young's double slit(YDS) experiment:

Question # 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:

Question # 5

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

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

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

Question # 8

Huygen's theory cannot explain

Question # 9

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 # 10

The wave nature of light was proposed by:

Question # 11

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

Question # 12

When the object lies between F and 2F, the image formed by is formed at:

Question # 13

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

Question # 14

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 A prism splits a beam of white light into seven component colors. This is so because
A. Phase of different colors is different
B. Amplitude of different colors is different
C. Wavelength of different colors is different
D. Velocity of different colors is different
2 Laws of reflection and refraction can also be explained by:
A. Particle nature of light
B. Quantum nature of light
C. Wave nature of light
D. Complex nature of light
3 To sources are said to be coherent if they have:
A. Same amplitude
B. Same wavelength
C. Definite phase relation with each other
D. None of them
4 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
5 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
6 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
7 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
8 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
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 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front

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