# Physics Specimen Paper Sec-D 2024 Solved for ISC Class-12

Physics Specimen Paper Sec-D 2024 Solved for ISC Class-12. Step by step solutions as council prescribe guideline of model sample question paper.  During solutions of Physics specimen paper we explain with figure, graph, table whenever necessary. student can achieve their goal in next upcoming exam of council. Visit official website CISCE for detail information about ISC Board Class-12.

## ISC Class-12 Physics Specimen Paper 2024 Solved sec-D

 Board ISC Class 12th (xii) Subject Physics (Section-D) Topic ISC Specimen Paper Solved Syllabus on Revised syllabus Session 2023-24

### ISC Class-12 Physics Specimen Paper 2024 Solved sec-D

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Time Allowed: Three hours

(Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time).

• This paper is divided into four sections – A, B, C and D.
• Section A consists of one question having sub-parts of one mark each.
• Section B consists of seven questions of two marks each.
• Section C consists of nine questions of three marks each, and
• Section D consists of three questions of five marks each.
• Internal choices have been provided in two questions each in Section B, Section C and Section D.
• The intended marks for questions are given in brackets [ ].
• All working, including rough work, should be done on the same sheet as and adjacent to the rest of the answer.
• Answers to sub parts of the same question must be given in one place only.
• A list of useful physical constants is given at the end of this paper.
• A simple scientific calculator without a programmable memory may be used for calculations.

### SECTION D – 15 MARKS

ISC Class-12 Physics Specimen Paper 2024 Solved sec-D

#### Question 18.

(i)

(a) A closed loop of area 1 m2 and resistance of 10Ω is free to rotate about an axis passing through its plane and the centre. If the loop is placed at right angles to a magnetic field B = 0.2 Wb/m2 and turned through 180° in 0.02 second, then determine (I) induced emf and (II) induced current in the loop.

(b) A wire is wound into a solenoid of length l and radius r. It has a self-inductance of L. By what factor does the self-inductance change, if the same wire is wound into a solenoid of half the length and half the radius?

OR

(ii)

(a) In a series LCR circuit connected to an alternating voltage source of 220V50Hz, the readings of voltmeters across resistor, capacitor and inductor are 70V, 415V, 210V respectively.

If the value of the resistance R =100Ω, calculate

(1) current in the circuit.
(2) value of L.
(3) value of C.

(b) If the capacitance in an LC series circuit is doubled, by what value should the inductance be changed to keep its resonant frequency constant?

#### Question 19.

(i)

(a) Uranium undergoes nuclear fission as shown in the following nuclear reaction. ………….

Calculate the energy released during the fission reaction.

(b) Write any one balanced equation to represent nuclear fusion.

(c) In Rutherford’s α-particle scattering experiment, it was observed that most of the α-particles did not deflect; some showed a deflection of more than 90° and some were deflected by even 1800.

(1) What hypothesis was made to justify the deflection of α-particle by more than 90°?

(2) State any one postulate of Bohr’s theory.

OR

(ii)

(a)

(1) Define unified atomic mass unit.
(2) Write its energy equivalent.
(3) What is the physical significance of binding energy per nucleon of a nucleus?

(b) The wavelength of the first line of Balmer series (Hα) is 656·3nm. Calculate the value of the Rydberg’s constant.

#### Question 20.

A rain sensor is a device used for sensing rain. They are used to automatically activate windscreen wipers to remove water from the windshields An IR LED is used to shine infrared light onto the windshield at an angle of 45°, which is then detected using an IR
photodiode.

(i) Name the two semiconductor diodes used in the rain sensor.
(ii) What kind of biasing is used in each of these diodes?
(iii) Draw the symbol of LED.

Useful Constants & Relations:

………………..

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