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

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

Question # 2

The distance from eye to near point is taken as:

Question # 3

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

Question # 4

Angle between the ray of light and the corresponding wavefront is:

Question # 5

Light has:

Question # 6

Which one of the following can act approximately as a source of monochromatic light;

Question # 7

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

Question # 8

Huygen principle is used to determine:

Question # 9

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

Question # 10

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

Question # 11

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:

Question # 12

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

Question # 13

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

Question # 14

Laws of reflection and refraction can also be explained by:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 To observe interference of light, the condition, which must be met with is that the sources must be:
A. Monochromatic
B. Phase coherent
C. Both of above
D. None of above
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 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
4 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
5 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
6 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
7 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
8 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
9 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
10 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

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