Question # 1

In order to get interference using two light rays

Choose an answer

The sources should be monochromatic and coherent

The sources should have the same frequency

Superposition should be linear

All of these

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

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

Choose an answer

No. of lines/cm

No. of lines/meter

Total number of lines

None of above

With age, least distance of distinct vision:

Choose an answer

Increases

Decreases

Is not affected

None is correct

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

Choose an answer

F

2F

Infinity

None of these

The distance from eye to near point is taken as:

Choose an answer

10 cm

15 cm

20 cm

25 cm

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

Choose an answer

Crest

Trough

Wavelength

Wave-front

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

Choose an answer

Bright

Dark

Any of A and B

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

Choose an answer

Focal length

Aperture

Linear magnification

Principal axis

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

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

Choose an answer

Refraction

Reflection

Diffraction

Formation of spectrum

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

Choose an answer

Dispersion

Interference

Reflection

Refraction

Huygen's theory cannot explain

Choose an answer

Diffraction

Interference

Polarization

Photoelectric effect

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

To see the minor details of the object by microscope, it should have:

Choose an answer

High magnifying power

High resolving power

Am objective of larger focal length

None of these

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

Choose an answer

Monochromatic

Phase coherent

Both of above

None of above

More Classes

Other Links

Physics ECAT Pre Engineering 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

Choose an answer

Choose an answer