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

00:00
Question # 1

The least distance of distinct vision is:

Question # 2

Laws of reflection and refraction can also be explained by:

Question # 3

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

Question # 4

In case of point, source of light shape of wavefront is:

Question # 5

To sources are said to be coherent if they have:

Question # 6

Angle between the ray of light and the corresponding wavefront is:

Question # 7

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

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

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The size of the image is maximum when its distance from the magnifying glass is:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
3 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
4 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
5 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
6 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
7 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
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 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
10 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

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