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

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

Question # 2

Huygen's principles states that:

Question # 3

The wave nature of light was proposed by:

Question # 4

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

Question # 5

In order to get interference using two light rays

Question # 6

The appearance of the colour in the soap (oil) film results from:

Question # 7

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

Question # 8

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 9

A convex lens acts as diverging lens when the object is placed:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The contrast in the fringes in an interference pattern depends upon

Question # 14

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

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
2 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
3 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
4 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
5 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
6 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
7 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
8 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
9 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
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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