ISC Physics Semester-1 Solved Specimen Paper 2022 Class-12

ISC Physics Semester-1 Solved Specimen Paper 2022 Class-12 for practice.  Step by step solutions of ISC Class-12 specimen model sample paper .  During solutions of semester-1 Physics specimen paper we explain with figure , graph, table whenever necessary so that student can achieve their goal in next upcoming exam of council .

ISC Physics Semester-1 Solved Specimen Paper 2022 Class-12

Board	ISC
Class	12th (XII)
Subject	Physics
Topic	Semester-1 ISC Specimen Paper Solved
Syllabus	on bifurcated syllabus (after reduction)
session	2021-22
Question Type	MCQ/ Objective (as prescribe by council)
Total question	Total=50
Max mark	70

Solved Class-12 for practice Set of Physics Semester-1 ISC Specimen Model Sample Paper 

Warning :- before viewing solution view Question Paper

Question-1
The ratio of forces between two small spheres having a constant charge ‘q’ when placed in air to when placed in a medium of dielectric constant K, is;
Solution

Options (a) 1: K is correct

Explanation

Solution see in bottom

Question-2
When a soap bubble is given a positive charge, then its radius:
(a) Decreases

(b) Increases
(c) Remains unchanged

 (d) Nothing can be predicted as information is insufficient
Solution

Options (b) Increases is correct

Explanation

Solution see in bottom

Question-3

Four charges are arranged at the corners of a square
ABCD, as shown in the adjoining figure. The force on the charge ‘Q’ kept at the centre O is:
(a) Zero 

(b) Along the diagonal AC
(c) Along the diagonal BD 

(d) Perpendicular to side AB

Solution

Options (c) Along the diagonal BD is correct

Explanation

Solution see in bottom

Question-4

The surface charge density of a conductor, in the absence of another conductor: [1]
(a) Is proportional to the charge on the conductor and its surface area
(b) Inversely proportional to the charge and directly proportional to the surface area
(c) Directly proportional to the charge and inversely proportional to the surface area
(d) Inversely proportional to the charge and the surface area

Solution

Options (c) Directly proportional to the charge and inversely proportional to the surface area is correct

Explanation

Solution see in bottom

Question-5

Which of the following is not the characteristic of resonance in an LCR series circuit?
(a) ………
(b)…………..
(c) ………….
(d) …………..

Solution

Options(c) 2πfL = 2πfC is correct

Explanation

Solution see in bottom

Question-6

A graph showing variation in impedance Z of a series LCR circuit, with frequency f of alternating emf applied to it is shown below. What is the minimum value of this impedance
(a) ………
(b)…………..
(c) ………….
(d) …………..

Solution

Options (a) R is correct

Explanation

Solution see in bottom

Question-7

An electric dipole of moment 𝑝⃗ is placed in a uniform electric field 𝐸⃗⃗. It has maximum (negative) potential energy when the angle between 𝑝⃗ and 𝐸⃗⃗ is:
(a) ………
(b)…………..
(c) ………….
(d) …………..

Solution

Options (c) π is correct

Explanation

Solution see in bottom

Question-8

A charge placed at a distance from a short electric dipole in the end-on position experiences a force F. If the distance is halved, then the force will become:

(a) 4F (b) 8F
(c) F/4 (d) F/8

Solution

Options (b) 8F is correct

Explanation

Solution see in bottom

Question-9

In figure 3 given below, Electric field intensity ‘E’ at a point P, at a perpendicular distance ‘r’ from an infinitely long line charge X’X having linear charge density  is given by:

(a) ………. (b) ………….
(c) ………… (d) ………..

Solution

Options (b) 𝐸 = (1/4𝜋𝜖0)2𝜆/r is correct

Explanation

Solution see in bottom

Question-10

Three capacitors, each of capacitance C, are connected in series. Their equivalent capacitance is Cs. The same three capacitors are now connected in parallel. Their equivalent capacitance becomes Cp. The ratio of Cp to Cs is:

(a) 9 : 1 (b) 1 : 9
(c) 3 : 1 (d) 1 : 3

Solution

Options (a) 9 : 1  is correct

Explanation

Solution see in bottom

Question-11

The charges q1 = 3F, q2 = 4F and q3 = -7F are placed on the circumference of a circle of radius 1.0m as shown in the figure below. What is the value of charge q4 placed on the same circle if the potential at the centre is

(a) -4µF (b) -3µF
(c) 7µF (d) 0

Solution

Question is wrong

Explanation

two question asked but option is one

Question-12

Three equal charges of 5.0µC each, are placed at the three vertices of an equilateral triangle of side 5.0cm each. The electrostatic potential energy of the system
of charges is:

(a) 13.5 J (b) 17.5 J
(c) 27 J (d) 15 J

Solution

Option (a) 13.5 J is Correct

Explanation

Solution see in bottom

Question-13

Three capacitors C1 = 3µF, C2 = 6µF and C3 = 10µF are connected to a 50V battery as shown in the figure below::

(a) 12µF, 150C (b) 4.75µF, 100C
(c) 12µF, 100C (d) 4.75µF, 150C

Solution

Option (c) 12µF, 100C is Correct

Explanation

Solution see in bottom

Question-14

A substance behaves like a magnet only if there are:
(a) at least some tiny current loops within the magnet
(b) stationary charges within the magnet
(c) magnet within the magnet
(d) none of these

Solution

Option (a) at least some tiny current loops within the magnet  is Correct

Explanation

Solution see in bottom

Question-15

A straight long wire is turned into a loop of radius R = 10 cm, as shown in figure 6 below. If a current I = 16 A is passed through the wire, then the magnetic field at
the centre of the loop is:
(a) 3.4 × 10−5𝑇 (b) 6.8 × 10−5𝑇
(c) 1.7 × 10−5𝑇 (d) 5.1 × 10−5T

Solution

Option (c) 1.7 × 10−5𝑇  is Correct

Explanation

Solution see in bottom

Question-16

The current in the circuit shown in figure 7 below, will b
(a) 1/45 A (b) 1/15 A
(c) 1/10 A (d) 1/5 A

Solution

Option (c) 1/10 A  is Correct

Explanation

Solution see in bottom

Question-17

The current in the circuit shown in figure 7 below, will b
(a) ……… (b) ……….
(c) ………….(d) …………

Solution

Option (b)  (E-V)R/V  is Correct

Explanation

Solution see in bottom

Question-18

The figure 8 given below shows currents in a part of an electric circuit. The current i is
(a) 1.7 A (b) 3.7 A
(c) 2.7 A (d) 4.7 A

Solution

Option (b) 3.7 A is Correct

Explanation

Solution see in bottom

Question-19

n identical cells each of e.m.f. E and internal resistance r are connected in parallel. An external resistance R is connected in series to this combination. The current
through R is:
(a) … (b) ……..
(c) ……… (d) ………

Solution

Option (b) nE/nR + r  is Correct

Explanation

Solution see in bottom

Question-20

The circuit shown in figure 9 below is used to compare the e.m.f. of two cells E1 and E2 where E2 > E1. The null point is at C when the galvanometer is connected to E1. When the galvanometer is connected to E2, the null point will b
(a) To the left of C (b) To the right of C
(c) At C itself (d) Nowhere on AB

Solution

Option (b) To the right of C  is Correct

Explanation

Solution see in bottom

Question-21

Figure 10 given below shows a graph of emf ‘ε’ generated by an ac generator verses time. What is the frequency of the emf?
(a) 10 Hz (b) 0.10 Hz
(c) 20 Hz (d) 50 Hz

Solution

Option (a) 10 Hz   is Correct

Explanation

Solution see in bottom

Question-22

If m, e,  and n respectively represent the mass, charge, average relaxation time and density of the electron, then what will be the resistance of a wire of length l and area of cross-section A?
(a)………. (b) …….
(c) ………. (d) ………..

Solution

Option (a) ml / ne2 A is Correct

Explanation

Solution see in bottom

Question-23

The drift velocity of a current carrying conductor is v. What will be the drift velocity if the current flowing through the wire is doubled?
(a) v / 4 (b) v / 2
(c) 2v (d) 4v

Solution

Option (c) 2v is Correct

Explanation

Solution see in bottom

Question-24

The resistance of a wire is 10. It is stretched so that its length becomes four times. What will be the new resistance of the wire?
(a) 40 Ω (b) 160.0 Ω
(c) 120 Ω (d) 80.0 Ω

Solution

Option (b) 160.0 Ω is Correct

Explanation

Solution see in bottom

Question-25

What is the angle between the current element 𝑑𝑙 ⃗⃗⃗⃗ and the magnetic flux density 𝐵⃗⃗ at point ‘P’ in the figure 11 given below
(a) Parallel to each other

(b) Perpendicular to each other
(c) Normal to each other

(d) Any angle between them is possible

Solution

Option (a) Parallel to each other  is Correct

Explanation

Solution see in bottom

Question-26 to Question 50 update today

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