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Physics (Theory) Set 1 2021-2022 ISC (Science) Class 12 Question Paper Solution

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Physics (Theory) [Set 1]
Marks: 35 Academic Year: 2021-2022
Date: April 2022
Duration: 1h30m
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Note :

  1. Candidates are allowed an additional 10 minutes for only reading the paper.
  2. They must NOT start writing during this time.
  3. All questions are compulsory.
  4. This question paper is divided in 3 Sections A, B and C
  5. The intended marks for questions are given in brackets [ ].
  6. All working, including rough work, should be done on the same sheet as and adjacent to the rest of the answer.
  7. Answers to sub parts of the same question must be given in one place only.
  8. A list of useful physical constants is given at the end of this paper.
  9. A simple scientific calculator without a programmable memory may be used for calculations.

SECTION - A
[7] 1
[1] 1.i

What is meant by a wavefront?

Concept: Huygens Principle
Chapter: [0.062] Wave Optics
[1] 1.ii

Find the de Broglie wavelength of electrons moving with a speed of 7 × 106 ms -1

Concept: de-Broglie Relation
Chapter: [0.07] Dual Nature of Radiation and Matter
[1] 1.iii

State how a p-type semiconductor will be obtained from a pure crystal of a semiconductor.

Concept: Extrinsic Semiconductor
Chapter: [0.09] Electronic Devices
[1] 1.iv

In the case of a regular prism, in minimum deviation position, the angle made by the refracted ray (inside the prism) with the normal drawn to the refracting surface is ______.

90°

60°

45°

30°

Concept: Optical Instruments - The Microscope
Chapter: [0.061] Ray Optics and Optical Instruments
[1] 1.v

In Young’s double slit experiment, what is the effect on fringe pattern if the slits are brought closer to each other?

Fringes disappear

Fringe width increases

Fringe width decreases

Fringe width remains unaltered

Concept: Interference of Light Waves and Young’s Experiment
Chapter: [0.062] Wave Optics
[1] 1.vi

The first line of Balmer series (Hα) in the spectrum of hydrogen is obtained when an electron of hydrogen atom goes from ______.

2nd orbit to 1st orbit

2nd orbit to 3rd orbit

3rd orbit to 2nd orbit

3rd orbit to 1st orbit

Concept: Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom
Chapter: [0.081] Atoms
[1] 1.vii

Which of the following graphs correctly represents the variation of maximum kinetic energy (Ek) of photoelectrons with the frequency (𝜈) of the incident radiation?

Concept: Einstein’s Equation - Particle Nature of Light
Chapter: [0.07] Dual Nature of Radiation and Matter
SECTION - B
[2] 2
[1] 2.i

What is meant by Constructive interference?

Concept: Interference
Chapter: [0.062] Wave Optics
[1] 2.ii

In Young’s double slit experiment, what should be the phase difference between the two overlapping waves to obtain 5th dark band/fringe on the screen?

Concept: Interference of Light Waves and Young’s Experiment
Chapter: [0.062] Wave Optics
[2] 3
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[2] 3.i

A thin converging lens of focal length 5cm is used as a simple microscope. Calculate its magnifying power when image formed lies at:

  1. Infinity.
  2. Least distance of distinct vision (D = 25 cm).
Concept: Optical Instruments - The Microscope
Chapter: [0.061] Ray Optics and Optical Instruments
OR
[2] 3.ii

A thin converging lens of focal length 12 cm is kept in contact with a thin diverging lens of focal length 18 cm. Calculate the effective/equivalent focal length of the combination.

Concept: Reflection of Light by Spherical Mirrors
Chapter: [0.061] Ray Optics and Optical Instruments
[2] 4
[1] 4.i

Define angular dispersion.

Concept: Dispersion by a Prism
Chapter: [0.061] Ray Optics and Optical Instruments
[1] 4.ii

State any one difference between a primary rainbow and a secondary rainbow.

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [0.061] Ray Optics and Optical Instruments
[2] 5
[1] 5.i

Explain the following term:

Intrinsic semiconductor

Concept: Intrinsic Semiconductor
Chapter: [0.09] Electronic Devices
[1] 5.ii

Explain the following term:

Extrinsic semiconductor

Concept: Extrinsic Semiconductor
Chapter: [0.09] Electronic Devices
[2] 6
[2] 6.i

Calculate the maximum kinetic energy of photoelectrons emitted by a metal (work function = 1.5 eV) when it is illuminated with light of wavelength 198 nm.

Concept: Einstein’s Equation - Particle Nature of Light
Chapter: [0.07] Dual Nature of Radiation and Matter
OR
[2] 6.ii

Calculate the minimum amount of energy which a gamma ray photon should have for the production of an electron and a positron pair..

Concept: Energy Levels
Chapter: [0.081] Atoms
SECTION - C
[3] 7
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[3] 7.i

In a single slit diffraction experiment, how does the angular width of the central maxima change when:

  1. screen is moved away from the plane of the slit?
  2. width of the slit is increased?
  3. light of larger wavelength is used?
Concept: Fraunhofer Diffraction Due to a Single Slit
Chapter: [0.062] Wave Optics
OR
[3] 7.ii

Using Huygen’s wave theory of light, prove Snell’s law of refraction of light.

Concept: Snell’s Law
Chapter: [0.061] Ray Optics and Optical Instruments
[3] 8

Draw a ray diagram of a refracting astronomical telescope when final image is formed at infinity. Also write the expression for its angular magnification (magnifying power).

Concept: Optical Instruments - Telescope
Chapter: [0.061] Ray Optics and Optical Instruments
[3] 9

Radius of curvature of an equi – convex lens of glass (n = 1.5) is 30 cm. Find its focal length. An object of height 5.0 cm is placed at a distance of 60 cm from the optical centre of the lens. Find the position and the height of the image formed.

Concept: Lensmaker's Formula
Chapter: [0.061] Ray Optics and Optical Instruments
[3] 10

On the basis of Bohr's theory, derive an expression for the radius of the nth orbit of an electron of the hydrogen atom.

Concept: Bohr’s Model for Hydrogen Atom
Chapter: [0.081] Atoms
[3] 11

Read the passage given below and answer the questions that follow.

Mr. Ravi had been living in a small town with his family for many years. He decided to shift to a city when he learnt that a nuclear power plant would be built in his town. His son Prakash, who was a science teacher, did not agree with his father’s decision.

Prakash explained to his father how mass defects during nuclear fission released energy. He assured his father that the authorities were taking all the possible safety measures to avoid any kind of nuclear mishap. Mr. Ravi understood the scientific explanation given by his son and decided not to shift to another place.

  1. What is the cause of energy generation of a nuclear reactor during nuclear fission?
  2. Write one nuclear reaction for nuclear fission that takes place in a nuclear reactor.
  3. Give the formula for the energy generation that takes place in the nuclear reactor.
Concept: Nuclear Reactions
Chapter: [0.08199999999999999] Nuclei
[3] 12
[3] 12.i
[1.5] 12.i.a

Draw the circuit diagram of a full wave rectifier.

Concept: Semiconductor Diode
Chapter: [0.09] Electronic Devices
[1.5] 12.i.b

Draw labelled graphs showing the input and output voltages.

Concept: Zener Diode as a Voltage Regulator
Chapter: [0.09] Electronic Devices
OR
[3] 12.ii
[1] 12.ii.a

With reference to Semiconductor Physics,

Name the diode that emits spontaneous radiation when forward biased.

Concept: Semiconductor Diode
Chapter: [0.09] Electronic Devices
[1] 12.ii.b

With reference to Semiconductor Physics,

Draw a labelled energy band diagram for a semiconductor.

Concept: Energy Bands in Conductors, Semiconductors and Insulators
Chapter: [0.09] Electronic Devices
[1] 12.ii.c

With reference to Semiconductor Physics,

Name the process that causes depletion region in a p-n junction.

Concept: Special Purpose P-n Junction Diodes
Chapter: [0.09] Electronic Devices

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CISCE previous year question papers Class 12 Physics (Theory) with solutions 2021 - 2022

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