Physics Specimen Paper Sec-B 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-B

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

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

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SECTION B – 14 MARKS

Question 2:

(i) You are provided with many identical capacitors each of capacitance 100μF. How will you connect a minimum number of them to obtain a capacitance of 75μF? Draw a diagram in support of your answer.

OR

(ii) Three point charges of 50nC each are kept at the vertices of an equilateral triangle having each side = 3m. Calculate electrostatic potential energy of the system.

Question 3: (i) With reference to free electron theory of conductors, define:

(a) Drift velocity
(b) State any one use of a potentiometer

Question 4: Explain why a blue coloured spark is often seen in a switch when a circuit containing an electric iron/geyser is switched off.

Question 5:

(i) Two long straight wires A and B are kept parallel to each other, 5 cm apart, in
vacuum. They carry currents of 5A and 10A respectively in the same direction as
shown in Figure 1 below. ……………..

(ii) An electron moving with a velocity of 8 × …………….

Question 6: Name the electromagnetic radiation:

(i) used for viewing through haze and fog.
(ii) which has the wavelength of 0·1 nm.

Question 7: Draw a neat and labelled ray diagram to show the formation of a primary rainbow.

Question 8: With reference to a semiconductor diode, explain the terms:

(i) Depletion region
(ii) Potential barrier or barrier p.d

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