# MCQs for practice

Level: Easy

Q1: How much positive charge and negative charge is there is a cup of water of mass 250g?

(a) 1.34 × 10⁶C

(b) 1.34 × 10⁷C

(c) 1.34 × 10⁸C

(d) 1.34 × 10⁹C

Q2: In nature, the electric charge of any system is always equal to

(a) half integral multiple of the least amount of charge

(b) zero

(c) square of the least amount of charge

(d) integral multiple of the least amount of charge

Q3: The force per unit charge is known as ______

(a) electric flux

(b) electric current

(c) electric field

(d) electric potential

Q4: Dielectric constant for a metal is

(a) zero

(b) infinite

(c) 1

(d) 10

Q5: Potential at a point x-distance from the centre inside the conducting sphere of radius R and having charge Q is proportional to

(a) Q/R

(b) Q/x

(c) Q/x²

(d) xQ

Q6: In a parallel plate capacitor, the capacity increases if

(a) area of the plate is decreased.

(b) distance between the plates increases.

(c) area of the plate is increased.

(d) dielectric constantly decreases.

Q7: In a Wheatstone bridge, all the four arms have equal resistance R. If resistance of the galvannmeter arm is also R, then equivalent resistance of the combination is

(a) R

(b) 2R

(c) R/2

(d) R/4

Q8: Kirchhoff's first rule at a junction in an electrical network, deals with conservation of

(a) energy

(b) eharge

(c) momentum

(d) both energy and charge

Q9: Which oflhe following characteristics of electrons determines the current in a conductor?

(a) Drift velocily alone

(b) Thermal velouny alone

(c) Both drift velocity and thermal velocity

(d) Neither drift nor thermal velocity

Q10: A strong magnetic field is applied on a stationary electron. Then the electron

(a) moves in the direction of the field.

(b) moves perpendicular to the direction of the field.

(c) remained stationary.

(d) moves opposite to the direction of the field.

Q11: The nature of parallel and anti-parallel currents are

(a) parallel currents repel and anti-parallel currents attract.

(b) parallel currents attract and anti-parallel currents repel.

(c) both currents attract.

(d) both currents repel.

Q12: Time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent of

(a) magnetic field

(b) mass of the particle

(c) charge the particle

(d) speed of the particle

Q13: A current loop behaves as a system of __________. As a result, it acts like a

magnetic dipole.

(a) maqnetic pole

(b) charges

(c) Both(a)and(b)

(d) None of these

Q14: The susceptibility of a certain magnetic material is 400. What is the class of the magnetic material?

(a) Diamagnetic

(b) Paramagnetic

(c) Ferromagnetic

(d) Ferroelectric

Q15: The earth behaves as a magnet with magnetic field pointing geographic

(a) North to South

(b) South to North

(c) East to West

(d) West to East

Q16: Lenz’s law is a consequence of the law of conservation of

(a) charge

(b) induced emf

(c) energy

(d) induced current

Q17: When the rate of change of current is unity, the induced emf is equal to

(a) thickness of coil

(b) number of turns in coil

(c) coefficient of self inductance

(d) total flux linked with coil

Q18: Whenever the flux linked with a circuit changes, there is an induced emf in the circuit. This emf in the circuit lasts

(a) for a very short duration

(b) for a long duration

(c) forever

(d) as long as the magnetic flux in the circuit changes.

Q19: To reduce the resonant frequency in an LCR series circuit with a generator

(a) the generator frequency should be reduced.

(b) another capacitor should be added in parallel to the first.

(c) the iron core of the inductor should be removed.

(d) dielectric in the capacitor should be removed.

Q20: In which of the following circuits the maximum power dissipation is observed?

(a) Pure capacitive circuit

(b) Pure inductive circuit

(c) Pure resistive circuit

(d) None of these

1: (b) 1.34 × 10⁷C

2: (d) integral multiple of the least amount of charge

3: (c) electric field

4: (b) infinite

5: (a) Q/R

6: (c) area of the plate is increased.

7: (a) R

8: (b) eharge

9: (a) Drift velocily alone

10:(c) remained stationary.

11: (b) parallel currents attract and anti-parallel currents repel.

12: (d) speed of the particle

13: (a) maqnetic pole

14: (c) Ferromagnetic

15: (b) South to North

16: (c) energy

17: (c) coefficient of self inductance

18: (d) as long as the magnetic flux in the circuit changes.

19: (b) another capacitor should be added in parallel to the first.

20: (c) Pure resistive circuit

Ch 1: Electric Charge and Fields (VSQA)

Ch 3: Current Electricity - (NCERT Solutions)

Ch 4: Moving Charges and Magnetism (VSQA)  