Question # 1

The focal length of convex lens having magnifying power of 5.55 is:

Choose an answer

5.5 cm

5 cm

4.5 cm

6 cm

In an interference pattern of Young's double slit(YDS) experiment:

Choose an answer

Bright fringesare wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

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

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

Choose an answer

0.10 m

0.15 m

0.20 m

0.25 m

The cause of mirage observed in deserts in bright sunlight is due to

Choose an answer

Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

Least distance of distinct vision of an old man possibly becomes:

Choose an answer

A little less than 25 cm

A little more than 25 cm

Much less than 25 cm

None of these

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

Choose an answer

Focus

Optical center

Edges

None of these

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

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

Choose an answer

Real

Virtual

Diminished

Erect

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

The image of the tip of a needle is never sharp because of

Choose an answer

Polarization of light

Interference of light

Diffraction of light

Reflection of light

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

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Choose an answer

The upper half of the image is cut off

The brightness of the image is reduced

The brightness of the image is increased

No effect at all

The distance from eye to near point is taken as:

Choose an answer

10 cm

15 cm

20 cm

25 cm

A magnifier gives an image which is:

Choose an answer

Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

With age, least distance of distinct vision:

Choose an answer

Increases

Decreases

Is not affected

None is correct

More Classes

Other Links

ECAT Pre General Science 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