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

00:00
Question # 1

Huygen's principles states that:

Question # 2

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

Question # 3

The distance from eye to near point is taken as:

Question # 4

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

Question # 5

According to Huygen's principle

Question # 6

To see the minor details of the object by microscope, it should have:

Question # 7

The terms phase difference and path difference are:

Question # 8

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

Question # 9

Conventionally, all the distance p, q, f are measured from _____ of the lens:

Question # 10

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

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

Huygen principle is used to determine:

Question # 13

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 14

Wave length of that color as compared to that of violet color is:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 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
4 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
5 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
6 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
7 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:
A. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm
8 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
9 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
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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