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

Physics Specimen Paper Sec-A 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-A

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

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

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 A – 14 MARKS

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

#### Question 1: (A) In questions (i) to (vii) below, choose the correct alternative (a), (b), (c) or (d) for each of the questions given below:

(i) Two bulbs of power ratings 100 W and 40 W, designed to operate on the same voltage, are connected in parallel to a battery source as shown in. Figure 1 below. Currents flowing across points 1,2 and 3 are I1, I2 and I3 respectively.

Choose the correct option.

(a) I1 > I2 > I3
(b) I1> I2 < I3
(c) I1 < I2 = I3
(d) I1 > I2 = I3

(ii) A circular coil having N turns of radius R carries a current I and produces a magnetic field T at its centre O.
If this coil is opened and rewound such that the radius of the newly formed coil is 2R, and the same current I passed through it, the magnetic field at the centre O will be:

(a) 2T
(b) T
(c) T/2
(d) T/4

(iii) Assertion: Magnetic lines of force do not intersect each other.

Reason: At the point of intersection, the magnetic field will have two directions.

(a) Both Assertion and Reason are correct, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

(iv) The focal length of a double convex lens is equal to the radius of curvature of either surface. The refractive index of its material is:

(a) 3/2
(b) 1
(c) 4/3
(d) Zero

(v) Which one of the following statements is correct in case of Fraunhofer’s single slit diffraction experiment?

(a) All bright fringes are of same intensity.
(b) Central bright fringe is the brightest.
(c) Central fringe is a dark fringe.
(d) Angular width of central fringe increases with an increase in wavelength of the incident monochromatic light.

(vi) The de Broglie wavelength of a moving particle varies:

(a) directly with its velocity.
(b) directly with its momentum.
(c) directly with its kinetic energy.
(d) inversely with its linear momentum.

(vii) Which one of the following statements is correct with reference to Semiconductor Physics?

(a) N type semiconductor has a majority of holes.
(b) To convert a pure semiconductor into a P type semiconductor, Phosphorous is used as a dopant.
(c) In energy band diagram of a metal, forbidden band is absent.
(d) Resistance of a semiconductor increases on increasing its temperature.

(B) Answer the following questions briefly:

(i) State any one advantage of a full wave rectifier over that of a half wave rectifier.
(ii) State the condition for a balanced Wheatstone bridge.
(iii) Name the rule used to determine the direction of induced current in the case of a straight conductor moving in a magnetic field.
(iv) With what type of source of light are plane wavefronts associated?
(v) Write an expression for the torque acting on an electric dipole kept in a uniform electric field in vector form.
(vi) In Young’s double slit experiment, what should be the path difference between two overlapping waves to form a bright band / fringe?
(vii) What are isotones?

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### 3 thoughts on “Physics Specimen Paper Sec-A 2024 Solved for ISC Class-12”

1. Sir apne phela and wrong kiya hai
P= VI
P directly proportional to I
100 W bulb mai jyada current jayega (I3)
Sequence: I1 >I3 >I2
(Diagram as per specimen )