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

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

Question # 2

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

Question # 3

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 # 4

The magnifier forms a virtual image of the object at:

Question # 5

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

Question # 6

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Light appears to travel in straight line because

Question # 11

Laws of reflection and refraction can also be explained by:

Question # 12

Light waves are:

Question # 13

Huygen principle is used to determine:

Question # 14

Electromagnetic waves transport:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these
2 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
3 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
4 A convex lens acts as diverging lens when the object is placed:
A. Between F and 2F
B. At 2F
C. With focal length
D. Beyond 2F
5 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
6 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
7 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
8 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
9 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
10 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these

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