ECAT Pre General Science Physics Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

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ECAT Pre General Science Physics Chapter 9 Physical Optics

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Question # 1

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

Question # 2

Huygen's theory cannot explain

Question # 3

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

Question # 4

Wave length of that color as compared to that of violet color is:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 9

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

Question # 10

The contrast in the fringes in an interference pattern depends upon

Question # 11

With age, least distance of distinct vision:

Question # 12

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 13

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 14

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

Question # 15

Conventionally, all the distance p, q, f are measured from _____ of the lens:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 To see the minor details of the object by microscope, it should have:
A. High magnifying power
B. High resolving power
C. Am objective of larger focal length
D. None of these
2 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
3 The cause of mirage observed in deserts in bright sunlight is due to
A. Refraction of light
B. Reflection of light
C. Scattering of light
D. Total internal reflection of light
4 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
5 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
6 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
7 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
8 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
9 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
10 Stars twinkle due to
A. The fact that they do not emit light continuously
B. The refractive index of earth's atmosphere fluctuates
C. The Star's atmosphere absorbs its light intermittently
D. None of these

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