# FSC Physics MCQs Chapter 9 Class 11

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Physics Ch 9 Class 11 PHYSICAL OPTICS

1 / 42

The phenomenon by which light travels in an optical fibres is:

NUMS 2016
Physics
Optics, Nature of Light and Optical Instruments
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2 / 42

mλ=2dsin(θ) this relation is called as

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3 / 42

Which photon carries the most energy?

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4 / 42

Light can be polarized by:

reflection
double refraction
scattering of light
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5 / 42

In an astronomical telescope, the lens called eyepiece forms an image of a distant object that is:

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6 / 42

Confining of wave into one plane is called

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In interference energy destroyed

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The main difference between X rays and Y rays is:

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What will be the position of the object, when a convex lens of focal length 20 cm, is used to form an erect image which is twice as large as the object?

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10 / 42

.Light can be polarized by which of the following methods?

I. scattering of light

II. double refraction

III. reflection

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11 / 42

An object placed in front of a concave mirror at a distance of X cm from the pole gives a 3 times magnified real image. If it is moved a distance of X+5cm, the magnification of the image becomes 2. The focal length of the mirror is:

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12 / 42

When a certain metal surface is illuminated with light of frequency v. the stopping potential for photoelectric current is V0. When the same surface is illuminated by light of frequency V/2, the stopping potential is VO-/4. The threshold frequency for photoelectric emission is:

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13 / 42

In Young’s Experiment, the central spot In Interference pattern is

14 / 42

Interference is shown by Light

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A microscope has an objective of 10 mm focal length and eyepiece of 25 mm focal length. What is the distance between the lenses if the object is in sharp focus when it is 10.5 mm from the objective?

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16 / 42

If an Electromagnetic wave is plane polarized, then the direction of electric field and magnetic field will be

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Light rays coming from the tube light are

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A mixture of electric fields and magnetic fields is?

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Incident rays of light parallel to the principal axis of a convex lens, after refraction by the lens, will:

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20 / 42

How can we define linear magnification produced by a lens?

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21 / 42

A parallel beam of white light is incident normally on a diffraction grating. It is noted that the second-order and third-order spectra partially overlap. Which wavelength in the third-order spectrum appears at the same angle as the wavelength of 600 nm in the second-order spectrum?

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22 / 42

When light enters from air to glass remains constant?

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In an astronomical telescope, the distance between the objective and eyepiece is called:

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24 / 42

The branch of Physics in which we study the properties of light and its applications on optical instruments is called?

25 / 42

Formation of colours in a thin film of oil is due to:

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26 / 42

The phenomenon by which light travels in an optical fibres is:

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27 / 42

Which of the following can be the objective of Polarization:

28 / 42

Which of the following series lies in the ultraviolet range:

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29 / 42

The distance between two fringes in double slit experiment is directly proportional to

30 / 42

Length of the telescope is:

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31 / 42

A 4 cm high object is located 10 cm from the converging lens, whose focal length is 20 cm. The image so formed will be:

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32 / 42

The central fringe in a diffraction pattern obtained by using a single slit is?

33 / 42

A microscope has an objective of 10 mm focal length and an eye piece of 25 mm focal length. What is the distance between the lenses, if the object is in sharp focus when it is 10.5 mm from the objective?

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34 / 42

If the grating element is made 1/10th the resolving power will become

35 / 42

The linear magnification produced by a lens is defined as the ratio of the:

I. Size of the image to the size of object

II. Size of the lens to the size of object

III. Size of the lens to the size of the image

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36 / 42

Wave fronts coming from small light bulb

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Sky appears blue due to?

38 / 42

In an experiment, an object was placed on the principal axis of a convex lens 25 centimetres away from the lens. A real image 4 times the size of the object was obtained. The focal length of the lens is:

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39 / 42

The range of wavelengths for visible light is between _______.

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40 / 42

Two glass prisms Pl and P2 are to be combined together to produce dispersion without deviation. The angle of the prisms P1 and P2 are selected as 40 and 30 respectively. If the refractive index of prism Pl is 1.54, then that of P2 will be:

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41 / 42

When a certain metal surface is illuminated with light of frequency v. the stopping potential for photoelectric current is V0. When the same surface is illuminated by light of frequency V/2, the stopping potential is VO-/4. The threshold frequency for photoelectric emission is:

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42 / 42

A real image formed by convex lenses is always:

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The average score is 54%

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