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

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

Question # 2

A line which represents the direction of travel of a wave is known as:

Question # 3

The locus of all the points in the same phase of vibration is called:

Question # 4

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 # 5

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

Question # 6

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

Question # 7

The magnifier forms a virtual image of the object at:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

For the virtual image, option _______ is not correct:

Question # 14

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

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
2 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
3 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
4 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
5 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
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 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
8 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
9 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
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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