ISC Physics Semester-2 Solved Specimen Paper 2022 Class-12 for practice.  Step by step solutions of ISC Class-12 specimen model sample paper .  During solutions of semester-2 Physics specimen paper we explain with figure , graph, table whenever necessary so that student can achieve their goal in next upcoming exam of council .

## ISC Physics Semester-2 Solved Specimen Paper 2022 Class-12

 Board ISC Class 12th (XII) Subject Physics Topic Semester-2 ISC Specimen Paper Solved Syllabus on bifurcated syllabus (after reduction) session 2021-22 Question Type Descriptive Type  (as prescribe by council) Total question Total-12 (Section A, B & C) Max mark 35

### Solved Class-12 for practice Set of Physics Semester-2 ISC Specimen Model Sample Paper

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### SECTION A – 7 MARKS

ISC Physics Semester-2 Solved Specimen/ Sample/Model Paper 2022 Class-12

#### Question 1:

(i) What is meant by a wave front?

Answer : A surface composed at any instant of all the points just reached by a vibrational disturbance in its propagation through a medium.

(ii) Find the de Broglie wavelength of electrons moving with a speed of 7×106ms-¹.​​

de Broglie wavelength

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

Answer : A semiconductor is obtained from a pure crystal by doping it with a pentavalent impurity like arsenic, antimony.

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

(a) 90º

(b) 60 º

(c) 45 º

(d) 30 º

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

(a) Fringes disappear.

(b) Fringe width increases.

(c) Fringe width decreases.

(d) Fringe width remains unaltered.

(vi) First line of Balmer series (Hα) in the spectrum of hydrogen is obtained when an electron of hydrogen atom goes from:

(a) 2nd  orbit to 1st orbit

(b) 2nd orbit to 3rd orbit

(c) 3rd orbit to 2nd orbit

(d) 3rd orbit to 1st orbit

Answer : (d) 3rd orbit to 1st orbit

(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?

### SECTION B – 10 MARKS

Solved Model/Sample Paper 2022 Class-12 ISC Physics Semester-2

#### Question 2 :

(i) What is meant by Constructive interference?

(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?

#### Question 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:

(a) Infinity.

(b) Least distance of distinct vision (D = 25 cm).

OR

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

#### Question 4 :

(i) Define angular dispersion.

(ii) State any one difference between a primary rainbow and a secondary rainbow.

#### Question 5:

Explain the following terms:

(i) Intrinsic semiconductor.

(ii) Extrinsic semiconductor.

#### Question 6 :

(i) Calculate maximum kinetic energy of photoelectrons emitted by a metal (work function = 1·5eV) when it is illuminated with light of wavelength 198 nm.

OR

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

### SECTION C – 18 MARKS

Solved Model/Sample Paper 2022 Class-12 ISC Physics Semester-2

#### Question 7:

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

(a) screen is moved away from the plane of the slit?

(b) width of the slit is increased?

(c) light of larger wavelength is used?

OR

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

Question 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).

#### Question 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.

#### Question 10:

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

#### Question 11:

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 defect 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.

(i) What is the cause of energy generation of a nuclear reactor during nuclear fission?

(ii) Write one nuclear reaction for nuclear fission that takes place in a nuclear reactor.

(iii) Give the formula for the energy generation that takes place in the nuclear reactor.

#### Question 12:

(a) Draw the circuit diagram of a full wave rectifier.

(b) Draw labelled graphs showing the input and output voltages.

OR

(ii) With reference to Semiconductor Physics,

(a) Name the diode that emits spontaneous radiation when forward biased.

(b) Draw a labelled energy band diagram for a semiconductor.

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