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

Speed of light in vacuum depends upon:

Question # 2

Huygen's theory cannot explain

Question # 3

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

Question # 4

In an interference pattern of Young's double slit(YDS) experiment:

Question # 5

Light appears to travel in straight line because

Question # 6

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

Question # 7

The magnifier forms a virtual image of the object at:

Question # 8

For the virtual image, option _______ is not correct:

Question # 9

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

Question # 10

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

Question # 11

According to Huygen's principle

Question # 12

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 # 13

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
2 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
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 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
5 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q
6 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
7 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
8 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
9 The size of the image is maximum when its distance from the magnifying glass is:
A. 0.10 m
B. 0.15 m
C. 0.20 m
D. 0.25 m
10 The contrast in the fringes in an interference pattern depends upon
A. Fringe width
B. Relative difference intensities of the two sources
C. Distance between the slits
D. Wavelength

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