Class 12 Physics Sample Paper Term 1 Set D

Please refer to Class 12 Physics Sample Paper Term 1 Set D with solutions below. The following CBSE Sample Paper for Class 12 Physics has been prepared as per the latest pattern and examination guidelines issued by CBSE. By practicing the Physics Sample Paper for Class 12 students will be able to improve their understanding of the subject and get more marks.

CBSE Class 12 Physics Sample Paper for Term 1

Section A
Question 1. Let Ea be the electric field due to a dipole in its axial plane distant l and let Eq be the field in the equatorial plane distant l. The relation between Ea and Eq is:
a) E_a = 2E_q
b) E_a = E_q
c) E_a = 2E_a
d) E_a = 3E_q

Question 2. Electric potential of earth is taken to be zero, because earth is a good
a) insulator
b) semiconductor
c) conductor
d) dielectric

Question 3. The wire of the potentiometer has resistance 4 ohms and length 1 m. It is connected to a cell of e.m.f. 2 volts and internal resistance 1 ohm, if a cell of e.m.f. 1.2 volt is balanced by it, the balancing length will be
a) 60 cm
b) 50 cm
c) 90 cm
d) 75 cm

Question 4. What would happen if a plastic rod rubbed with fur is brought near the glass rod rubbed with silk?
a) None of these
b) Attract each other.
c) Mix up with each other.
d) Repel each other.

Question 5. Two infinite plane parallel non conducting sheets, separated by a distance d have equal and opposite charge densities . Electric field intensity at a point between the sheets is:
a) depends upon location of the point
b) σ/2ε₀
c) zero
d) σ/ε₀

Question 6. According to Kirchhoff’s Loop Rule,
a) The absolute sum of changes in potential around any closed loop must be zero.
b) The algebraic sum of changes in potential around any closed loop must be zero.
c) The algebraic sum of changes in potential around any closed loop must be positive.
d) The algebraic sum of changes in potential around any closed loop must be negative.

Question 7. In a pure inductive circuit with a.c. source, the current lags behind emf by phase angle of
a) π/2
b) π/4
c) 2π
d) π

Question 8. The susceptibility of a paramagnetic material is χ at 27° C. At what temperature will its  susceptibility be x/2?
a) 54° C
b) 327° C
c) 237° C
d) 1600° C

Question 9. In a coil of self-induction 5 H, the rate of change of current is 2 A s^-1. Then, e.m.f. induced in the coil is
a) 10 V
b) -10 V
c) -5 V
d) 5 V

Question 10. A coil of self-inductance 50 H is joined to the terminals of a battery of emf 2 V through a resistance of 10Ω . What is the time-constant and maximum current finally established in the circuit?
a) 5 s and 0.2 A
b) 3 s and 0.5 A
c) 1s and 0.3 A
d) 8 s and 0.8 A

Question 11. A galvanometer coil has a resistance of 10Ω and the meter shows full-scale deflection for a current of 1 mA. The shunt resistance required to convert the galvanometer into an ammeter of range 0 – 100 mA is about:
a) 0.01 Ω
b) 0.1 Ω
c) 10 Ω
d) 1 Ω

Question 12. The current I in the given circuit is:

a) 0.3 A
b) 0.4 A
c) 0.1 A
d) 0.2 A

Question 13. A uniformly wound long solenoid of inductance L and resistance R is broken into two equal parts in the ratio η/1 , which are then joined in parallel. This combination is then joined to a cell of emf . The time constant of the circuit is
a) 2L/R
b) L/R
c) L/2R
d) L/R²

Question 14. The primary winding of a transformer has 500 turns, whereas its secondary has 5,000 turns. The primary is connected to an a.c. supply 20 V-50 Hz. The secondary will have an output of:
a) 200 V – 50 Hz
b) 200 V – 500 Hz
c) 2 V – 50 Hz
d) 2 V – 5 Hz

Question 15. The number of electrons for one coulomb of charge is
a) 6.25 × 10¹⁹
b) 6.25 × 10²³
c) 6.25 × 10²¹
d) 6.25 × 10¹⁸

Question 16. If the electric current in a lamp decreases by 5%, then the power output decreases by:
a) 20%
b) 25%
c) 10%
d) 5%

Question 17. What uniform magnetic field applied perpendicular to a beam of electrons moving at 1.3 10⁶ m/s, is required to make the electrons travel in a circular arc of radius 0.35 m?
a) 2.11 × 10^-5 T
b) 6 × 10^-5 G
c) 6 × 10^-5 T
d) 2.1 × 10^-5 G

Question 18. Choose the correct statement.
i. The capacitor can conduct in a d.c. circuit but not an inductor.
ii. In d.c. circuit the inductor can conduct but not a capacitor.
iii. in d.c. circuit both the inductor and capacitor cannot conduct.
iv. The inductor has infinite resistance in a d.c. circuit.
a) Option (i)
b) Option (iv)
c) Option (iii)
d) Option (ii)

Question 19. A tape-recorder records sound in the form of
a) magnetic energy
b) the magnetic field on the tape
c) electrical energy
d) variable resistance on the tape

Question 20. Four capacitors are connected in a circuit as shown in the figure. The effective capacitance between P and Q will be

a) 7.5 μF
b) 5 μF
c) 2 μF
d) 10 μF

Question 21. When a negatively charged conductor is connected to earth
a) Electrons flow from the earth to the conductor
b) Protons flow from the conductor to the earth
c) No charge flow occurs
d) Electrons flow from the conductor to the earth

Question 22. What are the dimensions of impedance?
a) ML³T^-3I^-2
b) M^-1L²T³I²
c) ML²T^-3I^-2
d) M^-1L³ T³I²

Question 23. A long solenoid has 800 turns per meter. A current of 1.6 A flows through it. The magnetic induction at the end of solenoid on its axis is
a) 16.0× 10⁻⁴T
b) 8.04× 10⁻⁴T
c) 4.0× 10⁻⁴T
d)  2.0× 10⁻⁴T

Question 24. Tesla is the unit of
a) magnetic induction
b) electric field
c) electric flux
d) magnetic flux

Question 25. A proton travelling at 23⁰ w.r.t the direction of a magnetic field of a strength 2.6 mT experiences, a magnetic force of 6.5× 10^-17 N. What is the speed of the proton?
a) 6 × 10⁵ m/second
b) 8 × 10⁵  m/second
c) 2 × 10⁵  m/second
d) 4 × 10⁵ m/second

Section B

Question 26. A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upward. The particle will:
a) move in a circular path with an increased speed
b) get deflected in a vertically upward direction
c) move in a circular path with a decreased speed
d) move in a circular path with a uniform speed

Question 27. If potential (in volts) in a region is expressed as V(x, y, z) = 6xy – y + 2yz, the electric field (in N/C) at point (1, 1, 0) is:

Question 28. Two equal negative charges -q are fixed at points (0, a) and (0, -a). A positive charge Q is released from rest at the point (2a, 0) on the x-axis. The charge Q will:
a) Move to origin and remain at rest
b) Execute oscillation but not SHM
c) Execute SHM about the origin
d) Move to infinity

Question 29. A step down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the line is
a) 3 A
b) 30 A
c) 2.4 A
d) 0.3 A

Question 30. Whenever a magnet is moved either towards or away from a conducting coil, an e.m.f is induced, the magnitude of which is independent of
a) the number of turns in the coil
b) the resistance of the coil
c) the speed with which, the magnet is moved
d) the strength of the magnetic field

Question 31. Angle of dip is 90° at 
a) both poles and equator
b) equator
c) poles
d) none of these

Question 32. If the speed of rotation of a dynamo is doubled, then the induced e.m.f. will
a) become four times
b) become half
c) become double
d) remain unchanged

Question 33. In the arrangement shown in the figure, the current through 5 Ω resistor is:

a) 12/7
b) 2 A
c) Zero
d) 1 A

Question 34. The potential at the centre of the sphere, if the hollow metallic sphere of radius 10 cm is charged such that the potential of its surface is 70 V, is
a) 35 V
b) 7 V
c) 70 V
d) 100 V

Question 35. In a meter bridge experiment, a balance point is obtained at a distance of 60 cm from the left end when unknown resistance R is in a left gap and 8 ohms resistor is connected in the right gap. When the position of R and 8 ohm resistor is interchanged the balance point will be at distance of
a) 40 cm
b) 30 cm
c) 60 cm
d) 50 cm

Question 36. Alternating current can not be measured by d.c. ammeter, because:
a) average value of current of complete cycle is zero
b) a.c. cannot pass through a.c. ammeter
c) a.c. ammeter will get damaged
d) a.c. changes direction

Question 37. A straight line conductor of length 0.4 m is moved with a speed of 7 ms^-1 perpendiculars to the magnetic field of intensity 0.9 Wbm-2. The induced emf across the conductor is
a) 5.24 V
b) 25.2 V
c) 2.52 V
d) 1.26 V

Question 38. The μ₀ is also known as :
a) magnetic dipole
b) Absolute Permittivity
c) Magnetic dipole moment
d) Magnetic flux

Question 39. In a series RLC circuit R = 300 , L = 60 mH, C = 0.50 μF applied voltage V = 50 V and ω= 10,000 rad/s. Inductive reactance X_L, capacitive reactance X_C and impedance Z are
a) 600Ω , 200Ω and 500Ω
b) 450Ω , 200Ω and 450Ω
c) 550Ω , 300Ω and 100Ω
d) 500Ω , 250Ω and 500Ω

Question 40. The current in the given circuit is:

a) 2 A
b) 4.92 A
c) 8.31 A
d) 6.28 A

Question 41. In India, electricity is supplied for domestic use at 220 V. It is supplied at 110 V in the U.S.A.If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in the U.S.A. will be:
a) 2R
b) R/4
c) R
d) R/2

Question 42. An electric dipole with dipole moment 4× 10⁻⁹ Cm is aligned at 30∘ with the direction of a uniform electric field of magnitude 5× 10⁴N/C . Calculate the magnitude of the torque
a) 1.0× 10⁻⁴Nm
b) 1. 5× 10⁻⁸Nm
c) 2. 5× 10⁻⁴Nm
d) 3. 5× 10⁻⁴Nm

Question 43. Two infinitely long wires carry currents in opposite directions. Then the field at a point P lying midway between them is
a) twice the field due to each wire alone
b) square of the field due to each wire alone
c) zero
d) half of the field due to each wire alone

Question 44. The force between two magnetic poles is F. If the distance between the poles and pole strengths of each pole are doubled, then the force experienced is:
a) F
b) F/4
c) 2F
d) F/2

Question 45. Assertion (A): Electric potential of the earth is taken zero.
Reason (R): No electric field exists on the earth’s surface.
a) Both A and R are true and R is the
b) Both A and R are true but R is not the correct explanation of A. correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.

Question 46. Assertion (A): If a compass needle is kept at the magnetic north pole of the earth the compass needle may stay in any direction.
Reason (R): Dip needle will stay vertical at the north pole of the earth.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.

Question 47. Assertion (A): A piece of copper and a similar piece of stone are dropped simultaneously from a height near the earth’s surface. Both will touch the ground at the same time.
Reason (R): There is no effect of the earth’s magnetic field on the motion of falling bodies.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is NOT the correct explanation of A
c) A is true but R is false
d) A is false and R is also false

Question 48. Assertion (A): Faraday’s laws are consequences of the conservation of energy.
Reason (R): In a purely resistive AC circuit, the current lags behind the emf in phase.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.

Question 49. Assertion (A): A metallic shield in form of a hollow shell may be built to block an electric field.
Reason (R): In a hollow spherical shield, the electric field inside it is zero at every point.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.

Section C

Question 50. Four-point charges -Q, -q, 2q, and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is:
a) Q = − 1/q
b) Q =  1/q
c) Q = -q
d) Q = q

Question 51. In Fig, two positive charges q₂ and q₃ fixed along the y axis, exert a net electric force in the + x direction on a charge q₁ fixed along the x axis. If a positive charge Q is added at (x, 0), the force on q₁

a) shall increase along the positive xaxis.
b) shall point along the negative x-axis.
c) shall decrease along the positive xaxis.
d) shall increase but the direction changes because of the intersection of Q with q₂ and q₃.

Question No. 52 to 55 are based on the given text. Read the text carefully and answer the questions:

The rate of flow of charge through any cross-section of a wire is called electric current flowing through it. Electric current (I) = . Its SI unit is ampere (A). The conventional direction of electric current is the direction of motion of positive charge. The current is the same for all cross-sections of a conductor of the non-uniform cross-section. Resistance is a measure of the opposition to current flow in an electrical circuit.

Question 52. An example of non-ohmic resistance is:
a) carbon resistance
b) tungsten wire
c) diode
d) copper wire

Question 53. Current is:
a) both scalar and vector quantity
b) vector quantity
c) scalar quantity
d) none of these

Question 54. In a current-carrying conductor, the net charge is:
a) zero
b) 6.25 × 10^–18 coulomb
c) 1.6 × 10^–19 coulomb
d) infinite

Question 55. The current which is assumed to be flowing in a circuit from the positive terminal to negative is called:
a) none of these
b) conventional current
c) pulsating current
d) direct current