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

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

Question # 2

The least distance of distinct vision is:

Question # 3

To observe interference of light, the condition, which must be met with is that the sources must be:

Question # 4

Laws of reflection and refraction can also be explained by:

Question # 5

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

Question # 6

Monochromatic light means waves of:

Question # 7

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

Question # 8

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

Question # 9

In the formula R = N x m for diffraction grating, N denotes:

Question # 10

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

Question # 11

The velocity of light in vacuum can be changed by changing

Question # 12

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

Question # 13

The terms phase difference and path difference are:

Question # 14

To sources are said to be coherent if they have:

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 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
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 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
4 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
5 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
6 The locus of all the points in the same phase of vibration is called:
A. Wave packet
B. Wave front
C. Wave number
D. None of them
7 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
8 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
9 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
10 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

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