# Class 12 Physics Sample Paper Term 1 With Solutions Set D

Please refer to Class 12 Physics Sample Paper Term 1 With Solutions Set D below. These Class 12 Physics Sample Papers will help you to get more understanding of the type of questions expected in the upcoming exams. All sample guess papers for Physics Class 12 have been designed as per the latest examination pattern issued by CBSE. Please practice all Term 1 CBSE Sample Papers for Physics in Standard 12.

## Sample Paper Term 1 Class 12 Physics With Solutions Set D

Section A

Question. An electric dipole placed in non-uniform electric field experiences:
a) both a torque and a net force
b) no torque and no net force
c) only a force but no torque
d) only a torque but no net force

A

Question. What would be the voltage across C3?

A

Question. The charge flowing through a resistance R varies with time t as Q = at – bt2, where a and b are positive constants. The total heat produced in R is:

D

Question. A point charge Q is moved along a circular path around another fixed point charge. So, the work done is
a) always zero
b) zero only if Q returns to it’s starting position
c) zero only if the two charges have the same magnitude
d) zero only if the two charges have the same magnitude and opposite signs

A

Question. A parallel plate capacitor of capacitance C is connected to a battery and is charged to a potential difference V. Another capacitor of capacitance 2C is similarly charged to a potential difference 2V. The charging battery is then disconnected and the capacitors are connected in parallel to each other in such a way that the positive terminal of one is connected to the negative terminal of the other. The final energy of the configuration is –

B

Question. A metal rod of length 10 cm and a rectangular cross-section of 1cm × 1/2 cm is connected to a battery across opposite faces. The resistance will be
a) same irrespective of the three faces
b) maximum when the battery is connected across 10 cm × 1 cm
c) maximum when the battery is connected across 1cm × 1/2 cm
d) maximum when the battery is connected across 10 cm × 1/2 cm

C

Question. The average emf induced in which current changes from 0 to 2 A in 0.05 sec is 8 V. The selfinductance of the coil is:
a) 0.4 H
b) 0.2 H
c) 0.1 H
d) 0.8 H

B

Question. The magnetic moment of a current (l) carrying circular coil of radius (r) and number of turns (n) varies as
a) 1 / r2
b) r
c) 1 / r
d) r2

D

Question. What should be the core of an electromagnet?
a) none of above
b) soft iron
c) hard iron
d) rusted iron

B

Question. The rms value of AC current which when passed through a resistor produces heat energy four times that produced by DC of 2 A through the same resistor in same time, is:
a) 32 A
b) 8 A
c) 2 A
d) 4 A

D

Question. A galvanometer having a resistance of 8 is shunted by a wire of resistance 2 . If the total current is 1 A, the part of it passing through the shunt will be:
a) 0.8 A
b) 0.3 A
c) 0.5 A
d) 1.2 A

A

Question. m2V-1s-1 is the SI unit of which of the following?
b) Mobility
c) Drift velocity
d) Resistivity

B

Question. There are two coils A and B as shown in Figure. A current starts flowing in B as shown when A is moved towards B and stops when A stops moving. The current in A is counterclockwise. B is kept stationary when A moves. We can infer that

a) there is a constant current in the counterclockwise direction in A
b) there is a constant current in the clockwise direction in A
c) there is no current in A
d) there is a varying current in A

A

Question. A 200 ohm resistor is connected in series with a 5μF capacitor. The voltage across the resistor is VR = 1.20 cos(2500t). Capacitive reactance is
a) 70 Ω
b) 80 Ω
c) 60 Ω
d) 90 Ω

B

Question. What is the flux through a cube of side a if a point charge q is at one of its corners?
a) 2q / ε0
b) q / ε0
c) q / 8ε0
d) q /2ε0

C

Question. A copper plate of thickness b is placed inside a parallel plate capacitor of plate distance d and area A as shown in the figure. The capacitance of a capacitor is

C

Question. The SI unit of magnetic pole strength is
a) ampere metre2
b) ampere metre-2
c) ampere per metre
d) ampere metre

D

Question. A transmitting station transmits radiowaves of wavelength 360 m. Find the inductance of the coil required with a condenser of capacity 1.20 pF in the resonant circuit.
a) 3.07  × 10-8 H
b) 2.25 × 10-8 H
c) 1.25 × 10-8 H
d) 1.9 × 10-8 H

A

Question. 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

A

Question. Submarine cables act as
a) spherical capacitor
b) cylindrical capacitor with inner cylinder earthed
c) parallel plate capacitor
d) cylindrical capacitor with outer cylinder earthed

D

Question. If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium, then the value of q is :
a) −Q/2
b) Q/4
c) −Q/4
d) Q/2

C

Question. A circuit has a resistance of 12 ohm and an impedance of 15 ohm. The power factor of the circuit will be
a) 0 ⋅ 8
b) 1 ⋅ 125
c) 0 ⋅ 4
d) 1 ⋅ 25

A

Question. The current flowing in a step down transformer 220 V to 22 V having impedance 220Ω is
a) 0.1 A
b) 0.1 mA
c) 1 A
d) 1 mA

A

Question. The magnetic moment has dimensions of
a) [L2A]
b) [L2T-1A]
c) [LT-1A]
d) [LA]

A

Question. A charged particle enters a magnetic field H with its initial velocity making an angle of 45° with H. The path of the particle will be:
a) a straight line
b) an ellipse
c) a circle
d) a helical

D

Section B

Question. If the resistance of a galvanometer is 6 and it can measure a maximum current of 2 A.
Then required shunt resistance to convert it into an ammeter reading up to 6 A, will be:
a) 2Ω
b) 3Ω
c) 5Ω
d) 4Ω

A

Question. An electric dipole of moment p is placed in an electric field of intensity E. The dipole acquires a position such that the axis of the dipole makes an angle θ with the direction of the field. Assuming that the potential energy of the dipole to be zero when θ = 90∘ , the torque and the potential energy of the dipole will respectively be
a) pEsinθ,−pEcos θ
b) pEcos θ,−pEcos θ
c) pEsinθ, 2pEcos θ
d) pEsinθ,−2pEcos θ

A

Question. Using mass (M), length (L), time (T) and current (A) as fundamental quantities, the dimension of permittivity is
a) ML-2T2A
b) MLT-2A
c) ML2T-1A2
d) M-1L-3T4A2

D

Question. A choke coil has
a) high inductance and high resistance
b) low inductance and high resistance
c) low inductance and low resistance
d) high inductance and low resistance

D

Question. There are two coils A and B. A current starts flowing in B if the coil A is made to rotate about a vertical axis (Figure). No current flows in B if A is at rest. The current in coil A,when the current in B (at t = 0) is counterclockwise and the coil A is as shown at this instant, t = 0, is

a) constant current counterclockwise
b) constant current clockwise
c) varying current counterclockwise
d) varying current clockwise

B

Question. In the magnetic meridian of a certain place, the horizontal component of the earth’s magnetic field is 0.26 G and the dip angle is 60o. What is the magnetic field of the earth at this location?
a) 0.52 G
b) 0.58 G
c) 0.65 G
d) 0.62 G

A

Question. The current flows from A to B as shown in the figure. The direction of the induced current in the loop is

a) none of these
b) anticlockwise
c) clockwise
d) straight line

C

Question. On increasing the temperature of a conductor, its resistance increases because the:
a) relaxation time increases
b) relaxation time decreases
c) relaxation time remains constant
d) electron density decreases

B

Question. Four capacitors each of 25μ F are connected in parallel. The voltmeter across them shows a dc of 200 V. The charge on each plate of capacitor is:
a) ±2× 10−3C
b) ±5× 10−2C
c) ±2× 10−2C
d) ±5× 10−3 C

D

Question. A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite directions. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of emfs is:
a) 5 : 4
b) 3 : 4
c) 3 : 2
d) 5 : 1

C

Question. In a transformer, number of truns in the primary is 140 and that in the secondary is 280. If current in primary is 4 A, then that in the secondary is:
a) 6 A
b) 10 A
c) 2 A
d) 4 A

C

Question. 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

B

Question. The susceptibility of ferromagnetic material is:
a) inversely proportional to square of temperature
b) inversely proportional to temperature
c) independent of temperature
d) directly proportional to temperature

B

Question. The wiring for a refrigerator contains a starter capacitor. A voltage of amplitude 170 V and frequency 60 Hz applied across the capacitor is to produce a current amplitude of 0.850 A through the capacitor. Capacitance required is
a) 17.8 μF
b) 13.3 μF
c) 15.3 μF
d) 23.4 μF

B

Question. Fuse wire should have:
a) high resistance, low melting point
b) high resistance, high melting point
c) low resistance, high melting point
d) low resistance, low melting point

A

Question. A wire of resistance 10 Ω is elongated by 10%. The resistance of the elongated wire is:
a) 12.1 Ω
b) 13.1 Ω
c) 10.1 Ω
d) 11.1 Ω

A

Question. Gauss’s law is valid for
a) any open surface
b) only irregular open surfaces
c) only regular closed surfaces
d) any closed surface

D

Question. In a coil of 0.1 m radius and 100 turns, 0.1 amp current is passed. What will be the magnetic field at the centre of the coil?
a) 6.28× 10−4 T
b) 4. 31× 10−2T
c) 2× 10−1T
d) 9. 81× 10−4T

A

Question.The intensity of magnetic field is H and the moment of a magnet is M Maximum potential energy is:
a) 4 MH
b) 3 MH
c) MH
d) 2 MH

D

Question. Assertion (A): Circuits containing high capacity capacitors, charged to high voltage should be handled with caution, even when the current in the circuit is switched off.
Reason (R): When an isolated capacitor is touched by hand or any other part of the human body, there is an easy path to the ground available for the discharge of the capacitor.
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.

A

Question. Assertion (A): Gauss’s law of magnetism is different from that for electrostatics.
Reason (R): Isolated magnetic poles are not known to exist.
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.

A

Question. Assertion (A): Eddy currents are produced in any metallic conductor when the magnetic flux is changed around it.
Reason (R): Electric potential determines the flow of charge.
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.

B

Question. Assertion (A): Ac is more dangerous than dc.
Reason (R): The frequency of ac is dangerous for the human body.
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.

A

Question. Assertion (A): Electron move away from a region of lower potential to a region of higher potential.
Reason (R): An electron has a negative charge.
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.

A

Section C

Question.  A hollow metal sphere of radius 10 cm is charged such that the potential at its surface is 80 V. The potential at the centre of the sphere is:
a) 80 V
b) 8 V
c) 800 V
d) Zero

A

Question. A body can be negatively charged by
a) Giving some protons to it
b) Giving excess of electrons to it
c) removing some electrons from it
d) Removing some neutrons from it

B

Question are based on the given text. Read the text carefully and answer the questions:

Emf of a cell is the maximum potential difference between two electrodes of the cell when no current is drawn from the cell. Internal resistance is the resistance offered by the electrolyte of a cell when the electric current flows through it. The internal resistance of a cell depends upon the following factors; (i) distance between the electrodes (ii) nature and temperature of the electrolyte (iii) nature of electrodes
(iv) area of electrodes.

For a freshly prepared cell, the value of internal resistance is generally low and goes on increasing as the cell is put to more and more use. The potential difference between the two electrodes of a cell in a closed circuit is called terminal potential difference and its value is always less than the emf of the cell in a closed circuit. It can be written as V = ε− Ir

Question.The terminal potential difference of two electrodes of a cell is equal to emf of the cell when
a) neither I ≠ 0 and I = 0
b) I ≠ 0
c) I = 0
d) both I ≠ 0 and I = 0

C

Question.A cell of emf and internal resistance r gives a current of 0.5 A with an external resistance of 12 and a current of 0.25 A with an external resistance of 25 . What is the value of internal resistance of the cell?
a) 7 Ω
b) 3 Ω
c) 1 Ω
d) 5 Ω

C

Question.Choose the wrong statement.
a) Terminal potential difference of the cell when it is being charged is given as V = + Ir.
b) Internal resistance of a cell decrease with the decrease in temperature of the electrolyte.
c) Potential difference across the terminals of a cell in a closed circuit is always less than its emf.
d) Potential difference versus current graph for a cell is a straight line with a -ve slope.

Question. An external resistance R is connected to a cell of internal resistance r, the maximum current flows in the external resistance, when
a) R = r
b) R > r
c) R < r
d) R = 1/r