Physics Specimen Paper Sec-D 2023 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 so that 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 2023 Solved sec-D

 Board ISC Class 12th (xii) Subject Physics (Section-D) Topic ISC Specimen Paper Solved Syllabus on Revised syllabus Session 2022-23

### ISC Class-12 Physics Specimen Paper 2023 Solved sec-D

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### SECTION D – 15 MARKS

ISC Class-12 Physics Specimen Paper 2023 Solved sec-D

Question 18:

(i) An 80Ω resistor, a 1·0 H inductor and a 40 𝜇F capacitor are connected in series to an a.c. supply of 220V such that the circuit draws the maximum current. At this
stage, calculate:

(a) Resonant frequency of the circuit.
(b) Capacitive reactance of the circuit.
(c) Impedance of the circuit
(d) Current flowing through the circuit.
(e) Phase difference between capacitive and inductive voltages.

OR

(ii) Figure 4 below shows two thick metallic rails CD and GH kept parallel to each other 0·8m apart. They are joined to each other by a resistance wire R having a resistance of 5Ω. A thick metallic rod PQ rests on the rails. There is a uniform magnetic field B = 0·2T, which is perpendicular to the plane of the rails, pointing into the paper.

Figure see in your question paper

(a) Calculate magnitude and direction of the current induced in the rod PQ if it is moved towards right with a constant velocity v = 36 km/hr.

(b) The rod PQ is now made to perform simple harmonic motion with a frequency of 3Hz and an amplitude of 4cm. Calculate the maximum value of the emf induced in the rod.

#### Question 19:

(i)

(a) Using Bohr’s theory of hydrogen atom, obtain an expression for the radius of the nth orbit of an electron in an atom.

(b) Draw a labelled graph of binding energy of a nucleus per nucleon versus its mass number. Mark the region where nuclei are relatively more stable.

OR

(ii)

(a) State the postulate of Bohr’s theory regarding

(1) Quantisation of angular momentum of an electron.

(2) Emission of energy by an atom.

(b) What is meant by the following terms ?

(1) Mass defect of a nucleus.

(2) Binding energy of a nucleus.

State how these two are related to each other.

#### Question 20: Read the passage given below and answer the questions that follow.

Optical instruments are of great utility. They help us in studying very tiny objects as well as very large heavenly bodies. Scientists have developed microscopes like electron microscopes which aid in studying tiny molecules of matter. They have also devised giant telescopes like Hubble telescope and James Web Space telescope which have enabled us to view distant galaxies hitherto unknown.

(i) Which optical instrument is used to study detailed structure of a virus?

(ii) What is the ability of an instrument to form an enlarged image of an object called?

(iii) Hubble telescope orbits around the earth like a satellite. What is the advantage of such a telescope over a similar one on earth’s surface?

(iv) An astronomical telescope consists of two convex lenses having focal length of 200cm and 4cm. When it forms final image at infinity, calculate its

(a) Magnifying power

(b) Length.

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