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

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Question # 1

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

Question # 2

The wave nature of light was proposed by:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 7

Huygen's principles states that:

Question # 8

The magnifier forms a virtual image of the object at:

Question # 9

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

Question # 10

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

Question # 11

Light waves are:

Question # 12

The locus of all points in a medium having same phase of vibration is called

Question # 13

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

Question # 14

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 # 15

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

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Sr.# Question Answer
1 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C
2 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°
3 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis
4 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
5 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
6 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
7 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
8 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
9 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
10 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them

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