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

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 2

When a source of light isat very large distance,the shape of wavefront is:

Question # 3

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 # 4

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

Question # 5

The least distance of distinct vision is:

Question # 6

A virtual image is formed when object is placed:

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

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 9

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 # 10

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

Question # 11

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

Question # 12

Light waves are:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
2 The contrast in the fringes in an interference pattern depends upon
A. Fringe width
B. Relative difference intensities of the two sources
C. Distance between the slits
D. Wavelength
3 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
4 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
5 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
6 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
7 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
8 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
9 Laws of reflection and refraction can also be explained by:
A. Particle nature of light
B. Quantum nature of light
C. Wave nature of light
D. Complex nature of light
10 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

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