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

According to Huygen's principle

Question # 2

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 3

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

Question # 4

In the formula R = N x m for diffraction grating, N denotes:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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 # 9

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

Question # 10

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

Question # 11

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:

Question # 12

When the object lies between F and 2F, the image formed by is formed at:

Question # 13

The appearance of the colour in the soap (oil) film results from:

Question # 14

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 # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
2 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
3 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called
A. Diffraction
B. Interference
C. Polarization
D. Dispersion
4 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
5 The locus of all points in a medium having same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wave-front
6 The magnifier forms a virtual image of the object at:
A. None of these
B. Least distance of distinct vision
C. Much farther than the least distance
D. Both A and B are correct
7 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum
8 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
9 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
10 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them

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