Question # 1

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

Choose an answer

1

0.2

2

0.1

Wave length of light, on the average, is given by:

Choose an answer

10^-14_m

10^-10_m

10^-6_m

10^-4_m

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:

Choose an answer

Double the size

Same size

Half the size

None of these

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

Choose an answer

Between F and 2F

At 2F

With focal length

Beyond 2F

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Choose an answer

Equal to

Greater than

Smaller than

None of these

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:

Choose an answer

5 cm

10 cm

15 cm

20 cm

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

Choose an answer

Crest

Trough

Wavelength

Wave-front

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Choose an answer

Greater, smaller

Smaller, smaller

Smaller, larger

Greater, larger

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

Choose an answer

Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, infrared rays, micro waves

Visible light, gamma rays, radio waves

Electromagnetic waves transport:

Choose an answer

Energy only

Momentum only

Both A and B are correct

None of is correct

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

Choose an answer

Greater than

Less than

Equal to

None of these

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

Choose an answer

R = N/m

R = m/N

R = N x m

None of these

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

Choose an answer

Greater than

Smaller than

Equal to

None of these

According to Huygen's principle

Choose an answer

light travels in straight line

Light is a transvers wave

Light has dual nature

All points on the primary wave-front are the sources of secondary wavelets

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

Choose an answer

Wave packet

Wave front

Wave number

None of them

The magnifier forms a virtual image of the object at:

Choose an answer

Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

More Classes

Other Links

ECAT Physics Chapter 9 Physical Optics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer