ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Question # 1

To sources are said to be coherent if they have:

Question # 2

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

Question # 3

The velocity of light in vacuum can be changed by changing

Question # 4

Frequency of red color as compared to that of violet color is:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The locus of all the points in the same phase of vibration is called:

Question # 14

With age, least distance of distinct vision:

Question # 15

The contrast in the fringes in an interference pattern depends upon

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
2 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light
3 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
4 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C
5 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
6 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
7 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
8 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
9 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
10 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

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