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

Huygen's theory cannot explain

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The property of light which does not change with the nature of the medium is:

Question # 7

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:

Question # 8

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 # 9

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

Question # 10

A prism splits a beam of white light into seven component colors. This is so because

Question # 11

The size of the image is maximum when its distance from the magnifying glass is:

Question # 12

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

Question # 13

Electromagnetic waves transport:

Question # 14

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 15

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

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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 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
4 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
5 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
6 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
7 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
8 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
9 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:
A. Double the size
B. Same size
C. Half the size
D. None of these
10 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°

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