# Class 12 Physics Sample Paper Term 1 with Solutions Set B

Please refer to Class 12 Physics Sample Paper Term 1 With Solutions Set B provided below. The Sample Papers for Class 12 Physics have been prepared based on the latest pattern issued by CBSE. Students should practice these guess papers for class 12 Physics to gain more practice and get better marks in examinations. The Term 1 Sample Papers for Physics Standard 12 will help you to understand the type of questions which can be asked in upcoming examinations.

## Term 1 Sample Paper for Class 12 Physics With Solutions Set B

Section – A

This section consists of 25 multiple choice questions with overall choice to attempt any 20 questions. In case more than desirable number of questions are attempted, ONLY first 20 will be considered for evaluation.

Q. 1. Charging occurs due to
(A) transfer of electrons
(B) transfer of protons
(C) transfer of neutrons
(D) None of these

A

Q. 2. Torque acting on a dipole having dipole moment vector p in a uniform electric field E is

C

Q. 3. Along an electric line of force, electric potential
(A) increases
(B) decreases
(C) remains same
(D) infinite

B

Q. 4. The capacitance between two plates of capacitor increases with
(A) increase the plate area and decrease the distance between the plates.
(B) decrease the plate area and increase the distance between the plates.
(C) decrease the plate area and distance between the plates.
(D) increase the plate area and distance between the plates.

A

Q. 5. Work done by moving a charged particle from one point to another in an electrostatic field __________ upon the path chosen.
(A) depends
(B) does not depend
(C) may or may not depend
(D) None of these

B

Q. 6. When cell of e.m.f. E is connected with an external resistance R, the potential difference across the cell becomes V. The internal resistance of the cell is:
(A) E − V/V R
(B) E − V/E R
(C) V − E/V R
(D) V − E/E R

A

Q. 7. When a current drawn from a cell increase, the potential difference across the terminal of cell is
(A) lowered
(B) more
(C) remain same
(D) infinite

A

Q. 8. When the wire carrying current is charged
(A) never
(B) Always
(C) At the time of switch on
(D) At the time of switch off

A

Q. 9. In the presence of an electric field, paths of electrons in metals are ________ between two successive collisions.
(A) straight in one direction
(B) straight in two directions
(C) curved
(D) none of these

C

Q. 10. Example of a non-ohmic resistance is:
(A) copper wire
(B) tungsten wire
(C) diode
(D) carbon resistor

C

Q. 11. Kirchhoff’s second law of electrical circuit is based on
(A) conservation of energy
(B) conservation of charge
(C) conservation of momentum
(D) none of these

A

Q. 12. Two parallel, long wires carry currents i1 and i2 with i1 > i2. When the current are in the same direction, the magnetic field at a point midway between the wire is 10 mT. If the direction of i2 is reversed, the field becomes 30 mT. The ratio i1/i2 is.
(A) 4
(B) 3
(C) 2
(D) 1

C

Q. 13. The magnetism of a magnet is due to
(A) spin of electrons
(B) the earth
(C) cosmic rays
(D) pressure of big magnet inside the earth

A

Q. 14. The magnetic field around a long straight current carrying wire is
(A) spherical symmetry
(B) cubical symmetry
(C) cylindrical symmetry
(D) unsymmetrical

C

Q. 15. An electron moves in a circular path with a uniform speed v. It produces magnetic field at the center of the circle. The radius of the circle is proportional to
(A) √B/v
(B) B/v
(C) √v/B
(D) v/B

D

Q. 16. A moving coil has N number of turns in a coil of effective area A, it carries a current I. Produced magnetic field is radial. the torque acting on the coil is given by
(A) NIBA
(B) N2IBA
(C) NI2BA
(D) NIB2A

A

Q. 17. In a moving coil galvanometer, the deflection of the coil q is related to the current i
(A) i ∝ tan θ
(B) i ∝ √θ
(C) i ∝ θ
(D) i ∝ θ2

C

Q. 18. The instantaneous flux associated with a closed circuit of 10 W resistance is indicated by the following reaction f = 6t2 – 5t + 1, then value in amperes of the induced current at t = 0.25 sec will be:
(A) 1.2
(B) 0.8
(C) 6
(D) 0.2

D

Q. 19. In electromagnetic induction, the induced charge is independent of
(A) time
(B) change of flux
(C) resistance of coil
(D) None of these.

A

Q. 20. A dynamo converts
(A) mechanical energy into thermal energy.
(B) Thermal energy into mechanical energy.
(C) mechanical energy into electrical energy.
(D) electrical energy into mechanical energy.

C

Q. 21. Figure represents an area A = 2 m2 situated in a uniform magnetic field B = 4 weber/m2 and making an angle of 60° with magnetic field lines. The magnetic flux through the area would be

(A) 4 weber
(B) 8 weber
(C) 4√3 weber
(D) 2√2 weber 60°

A

Q. 22. A.C power is transmitted from a power house at a high voltage as
(A) the rate of transmission is faster at high voltages.
(B) the rate of transmission is faster at low voltages.
(C) power cannot be transmitted at low voltages.
(D) it is more economical due to power loss.

D

Q. 23. Power in an A.C. circuit is rated per second at which
(A) charge flows
(B) energy spends
(C) current changes alternatively
(D) work is done

D

Q. 24. Which of the following represents the correct graph of inductive reactance XL and frequency f.

A

Q. 25 When an AC voltage of 220 V is applied to the capacitor C
(A) the current is in phase with the applied voltage.
(B) the charge on the plates is in phase with the applied voltage.
(C) the maximum voltage between plates is 220 V.
(D) power delivered to the capacitor is infinite.

B

Section – B

This section consists of 24 multiple choice questions with overall choice to attempt any 20 questions. In case more than desirable number of questions are attempted, ONLY first 20 will be considered for evaluation.

Q. 26. Electrostatic force between two charged particles in air is F. If charges are placed at the same distance in brass, what will be the force?
(A) zero
(B) F
(C) infinite
(D) None of these

A

Q. 27. If the electric field is i+2j+4k. Electric flux through a surface area 10 units lying in X-Y plane is
(A) 10 units
(B) 20 units
(C) 30 units
(D) 40 units

D

Q. 28. Work done in moving an electron from one point to another on an equipotential surface of 10 Volt potential
(A) 10 eV
(B) 10 V
(C) 1eV
(D) zero

D

Q. 29. Electric potential at a point (x, y, z) in vacuum is V = 3x2 volt. Find the electric field intensity at the point (1m, 2m, 3m) .
(A) 1 V/m
(B) 3 V/m
(C) 6 V/m
(D) 2 V/m

C

Q. 30. Two copper wires of same length, having different cross-sectional area in the ratio 1:3, are connected in series. The ratio of their drift velocities vd will be
(A) 3:1
(B) 9:1
(C) 1:3
(D) 1:9

A

Q. 31. When A wire of resistance 12 R is bent to form a circle. The effective resistance across its diameter is
(A) 2R
(B) 3R
(C) 4R
(D) R

B

Q. 32. Two heaters A (500 W, 220 V) and B (1000 W, 220 V) are connected in parallel to 220 V. Which heater produces more heat
(A) heater A
(B) heater B
(C) heater A and heater B produce same heat
(D) both heaters produce no heat.

B

Q. 33. When two bulbs A (40 W, 220 V) and B (60 W, 220 V) are connected in series, which bulb is brighter.
(A) bulb A
(B) bulb B
(C) both
(D) none of these

A

Q. 34. The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the center is 54 mT. What will be its value at the centre of the loop?
(A) 300 μT
(B) 500 μT
(C) 250 μT
(D) 150 μT

C

Q. 35. A current i ampere flows along an infinite long straight tube, then the magnetic induction at any point inside
(A) zero
(B) infinite
(C) μ0 2i/4π r T
(D) 2i/r T

A

Q. 36. A long solenoid is formed by 70 turns/cm. The current to produce a magnetic field of 20 mT inside the solenoid will be
(A) 2.27 A
(B) 1.5 A
(C) 1.8 A
(D) 3 A

A

Q. 37. A charged particles enters into a magnetic field with an angle of 30° with respect to the direction of magnetic field. The path of the particle is
(A) circular
(B) helical
(C) straight line
(D) elliptical

B

Q. 38. Two bar magnets of the same mass, same length and same breadth have magnetic moments M and 3M, respectively, are joined together pole for pole and suspended by string. The time period of assembly is 3 seconds. Now, polarity of one magnet is reversed and combination is again forced to oscillate in magnetic field, the time of oscillation is
(A) 3
(B) 2
(C) 2√2
(D) 3√2

D

Q. 39. A bar magnet having magnetic moment 0.4 JT–1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is
(A) zero
(B) –0.64 J
(C) –0.064 J
(D) –6.40 J

C

Q. 40. Two magnets are held together and are allowed to oscillate in the earth’s magnetic field with like poles together. 10 oscillations per minute are made but for unlike poles together only 4 oscillations per minutes are made. The ratio of magnetic moments is
(A) 16:21
(B) 21:16
(C) 29:21
(D) 21:29

C

Q. 41. At a certain place, the angle of dip is 60°and horizontal component of earth’s magnetic field is 1 orested. The earth’s total magnetic field is
(A) B = 2
(B) B = √3
(C) B = 2√2
(D) B = 3√2

A

Q. 42. The susceptibility of annealed iron at saturation is 5000. The permeability is
(A) 2.28 × 10–3
(B) 6.28 × 10–3
(C) 9.28 × 10–3
(D) 1.28 × 10–3

B

Q. 43. Two coils of self-inductances 9 mH and 4 mH are placed so close together that the effective flux in one coil is linked with other. The mutual inductance between these coils is
(A) 6mH
(B) 36 mH
(C) 4 mH
(D) 9 mH

A

Q. 44. Two solenoids of same cross-sectional area have their lengths and number of turns in the ratio of 1:3. The ratio of self-inductance of two solenoid is
(A) 1:3
(B) 1:9
(C) 3:1
(D) 9:1

A

Given below are two statements labelled as Assertion (A) and Reason (R)

Directions: In the following questions, a statement of Assertion (A) and is followed by a statement of
Reason (R). Mark the correct choice as:
(A) Both Assertion (A) and Reason (R) are true, and Reason(R) is the correct explanation of (A).
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) is false, but Reason (R) is true.

Q. 45. Assertion (A): A coulomb of charge is bigger than the charge on electron?
Reason (R): Electric charge is always quantized.

A

Q. 46. Assertion (A): Potential difference between two points is depend on path.
Reason (R): Electric field is a conservative field.

D

Q. 47. Assertion (A): Potentiometer measures the potential difference more accurately than a voltmeter.
Reason (R): There is no current drawn from external circuit in potentiometer.

A

Q. 48. Assertion (A): Earth’s magnetic field does not affect the functioning of a moving coil galvanometer.
Reason (R): Earth’s magnetic field is too weak.

A

Q. 49. Assertion (A): If an electron is not deflected when moving through a certain region of space, then the only possibility is that no magnetic field is present in that region.
Reason (R): Force on electron is directly proportional to the strength of the magnetic field.

A

Section – C

This section consists of 6 multiple choice questions with an overall choice to attempt any 5. In case more  than desirable number of questions are attempted, ONLY first 5 will be considered for evaluation.

Q. 50. If a + Q charge is placed outside a closed surface. The net electric flux emerging out through the surface is

(A) Q/2ε0
(B) 2Q/ε0
(C) Q/ε0
(D) zero

D

Q. 51. A circular loop of area 10 × 10–2 m2 rotates in a uniform magnetic field of 0.5 T. If the loop rotates about its diameter which is perpendicular to the magnetic field as shown in figure. The magnetic flux linked with the loop when its plane is normal to the field is

(A) 1 × 10–2 Wb
(B) 2 × 10–2 Wb
(C) 5 × 10–2 Wb
(D) zero

C

CASE STUDY

Read the following text and answer the questions Electric Field: The electric field is defined as the space surrounding by a charge in which all other test charge would experience force. It is a vector quantity that has both magnitude and direction. The magnitude of the vector is the electric field intensity, which is defined as the force per unit charge. Additionally, electric field strength is proportional to the density of lines of force i.e., electric field strength at a point is proportional to the number of lines of force cutting a unit area element placed normal to the field at that point. The  direction of the field is considered to be the same as the direction of the force, and it is expected to exert on a positive test charge. When the electric field is radially outward, then it is considered as a positive charge, and when the electric field is radially inward, then it is considered as a negative charge. The SI unit of the electric field is volt per meter.

Q. 52. Electric lines of force of a negative point charge are
(C) parallel lines
(D) circular loops

A

Q. 53. Which of the statement is false for electric lines of force?
(A) They start from a positive charge and terminate on a negative charge.
(B) They always form closed loops.
(C) They are parallel and equally spaced in uniform electric field.
(D) electric field line curves are continuous curve.

B

Q. 54. Electric field lines are curved in case of
(A) single positive and negative charge
(B) two like charges
(C) two equal and opposite charges
(D) Both (B) and (C)