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

Physics Specimen Paper Sec-C 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-C

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

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

Warning :- before viewing solution view Question Paper

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 C – 27 MARKS

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

#### Question 9.

Obtain an expression for intensity of electric field at a point in broadside position of an electric dipole.

#### Question 10.

(i) In Figure 3 shown below, all the cells are identical. The external resistance R is also same in both the circuits. ……….

If the same current flows through the resistor R in both the circuits, calculate the relation between r, the internal resistance of each cell and the external resistance R.

OR

(ii) The drift velocity of electrons in a conductor connected to a battery is given by

vd = -eEτ/m.

Here, e is the charge of the electron, E is the electric field, τ is the average time between collisions and m is the mass of the electron.

(a) How does the drift velocity change with an increase in the potential difference across the conductor?
(b) A copper wire of length ‘l’ is connected to a source. If the copper wire is replaced by another copper wire of the same area of cross-section but of length ‘4l’, how will the drift velocity change? Explain.

#### Question 11.

A galvanometer of resistance 100 Ω gives a full-scale deflection for a potential difference
of 200 mV.

(i) How will you convert this galvanometer into an ammeter of the range 0 – 2A?
(ii) Define an ampere in terms of force between two current carrying conductors.

#### Question 12.

(i)

(a) Draw the ray diagram of a compound microscope t when the final image lies at the least distance of distinct vision, D.
(b) Write an expression for magnifying power of an astronomical telescope when final image lies at infinity. (No derivation required)

OR

(ii) For refraction at convex spherical surface of denser medium η2 surrounded by a rarer medium of refractive index η1, derive a formula connecting object distance u, image distance v, and radius of curvature R for the object in rarer medium and a real image formed inside the denser medium.

#### Question 13.

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

#### Question 14.

(i) A certain metal emits photoelectrons with a green light but not with a yellow light. If this surface is illuminated with blue light and red light, which one of the two will cause photoelectric emission? Give a reason for your answer.

(ii) What conclusion can be drawn from this phenomenon regarding the nature of light?

#### Question 15.

A lens of focal length f is divided into two equal parts as shown in Figure 4A below. These parts are then arranged as shown in Figure 4B below.
In terms of the original focal length f,

(i) What is the focal length of the lens L1 ?
(ii) What is the focal length of the final combination?

………….

#### Question 16.

Using Ampere circuital law, obtain an expression for magnetic field B near a long current carrying straight conductor.

#### Question 17.

Young’s double-slit experiment is performed by a student. The examiner gives the following instructions to the student. State whether the responses of the student, in each case, are correct or incorrect. Give a reason for your answer.

(i) EXAMINER: The fringes on the screen are too crowded. Increase the distance between the fringes.

STUDENT increases the distance between the two slits (thinking that distance between the fringes increases on increasing the distance between slits).

(ii) EXAMINER: Bright fringes are not very bright. Increase their brightness. STUDENT moves the source of light towards the two slits.

(iii) EXAMINER: Compare the distance between central and first maxima with the distance between second and third maxima.

STUDENT measures and states that the distance between central and first maxima is MORE than that between second and third maxima

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