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

Stars twinkle due to

Question # 2

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 3

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

Question # 4

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

Question # 5

In order to get interference using two light rays

Question # 6

Electromagnetic waves transport:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

According to Huygen's principle

Question # 11

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 # 12

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

Question # 13

Huygen's principles states that:

Question # 14

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

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
2 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
3 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
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 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
6 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
7 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
8 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
9 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
10 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

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