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

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

Question # 2

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

Question # 3

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

Question # 4

The wave nature of light was proposed by:

Question # 5

The contrast in the fringes in an interference pattern depends upon

Question # 6

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

Question # 7

The magnifier forms a virtual image of the object at:

Question # 8

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 9

Wave length of light, on the average, is given by:

Question # 10

The focal length of convex lens having magnifying power of 5.55 is:

Question # 11

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

Question # 12

The image of the tip of a needle is never sharp because of

Question # 13

In order to get interference using two light rays

Question # 14

To observe interference of light, the condition, which must be met with is that the sources must be:

Question # 15

The least distance of distinct vision is:

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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 The locus of all the points in the same phase of vibration is called:
A. Wave packet
B. Wave front
C. Wave number
D. None of them
3 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
4 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
5 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
6 A prism splits a beam of white light into seven component colors. This is so because
A. Phase of different colors is different
B. Amplitude of different colors is different
C. Wavelength of different colors is different
D. Velocity of different colors is different
7 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
8 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
9 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
10 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these

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