Electromagnetism MCQs

Option A: 4 volt

Option B: 5 volt

Option C: 2 volt

Option D: 0.4 volt

Correct Answer: 2 volt ✔

Option A: weaken it

Option B: strengthen it

Option C: reverse its polarity

Option D: demagnetize it completely

Correct Answer: weaken it ✔

Option A: very low damping

Option B: very high damping

Option C: no damping at all

Option D: radial field disintegration

Correct Answer: very low damping ✔

Option A: a straight line parallel to the field

Option B: a parabola in a plane perpendicular to the field

Option C: a circle in a plane perpendicular to the field

Option D: a straight line along its initial direction

Correct Answer: a circle in a plane perpendicular to the field ✔

Option A: use a very long and fine suspension

Option B: use a coil of very large area

Option C: use a coil with very large number of turns

Option D: use a very strong magnetic field

Correct Answer: use a very strong magnetic field ✔

Option A: in series with the circuit

Option B: in parallel with circuit

Option C: in series with any of the parallel resistances in the circuit

Option D: in parallel with any of the series resistances in the circuit

Correct Answer: in series with the circuit ✔

Option A: a most sensitive galvanometer is used

Option B: a steady voltage cell is used

Option C: the balance point is close to the middle of the wire

Option D: a high resistance box is used in one of its gap

Correct Answer: the balance point is close to the middle of the wire ✔

Option A: 0.1 A

Option B: 1:00 AM

Option C: current sensitivity

Option D: 1 m A

Correct Answer: current sensitivity ✔

Option A: C/BAN

Option B: CAN/B

Option C: BAN/C

Option D: ABC/N

Correct Answer: C/BAN ✔

Option A: 18Ω

Option B: 30Ω

Option C: 24Ω

Option D: 12Ω

Correct Answer: 12Ω ✔

Option A: B = μNI

Option B: B = μN/I

Option C: B = μnI

Option D: Both B and C

Correct Answer: Both B and C ✔

Option A: 4πx10-9 WbA-1m-1

Option B: 4πx10-7 WbA-1m-1

Option C: 4πx10-10 WbA-1m-1

Option D: 4πx10-8 WbA-1m-1

Correct Answer: 4πx10-7 WbA-1m-1 ✔

Option A: a circle

Option B: a spiral

Option C: an ellipse

Option D: helix

Correct Answer: helix ✔

Option A: magnetic flux = flux density / area

Option B: magnetic flux = flux density x area

Option C: flux density = magnetic flux area

Option D: flux density = magnetic flux x area

Correct Answer: magnetic flux = flux density x area ✔

Option A: τ = NIAB cosφ

Option B: τ = NIAB sinφ

Option C: τ = NIAB tanφ

Option D: τ = NIAB

Correct Answer: τ = NIAB ✔

Option A: charge in motion

Option B: charge at rest

Option C: both

Option D: none

Correct Answer: charge in motion ✔

Option A: R=qB/mV

Option B: R=mV/qB

Option C: R=qmV/B

Option D: R=qmB/V

Correct Answer: R=mV/qB ✔

Option A: F=1/B

Option B: F=1/Bsinθ

Option C: F/0

Option D: F=1/Bcosθ

Correct Answer: F/0 ✔

Option A: be rotating

Option B: come to rest in N-S direction

Option C: vibrating like galvanometer needle

Option D: comes to rest after rotation

Correct Answer: come to rest in N-S direction ✔

Option A: independent mass m

Option B: directly proportional to m

Option C: directly proportional to q

Option D: directly proportional to B

Correct Answer: directly proportional to B ✔

Option A: maximum current flows through the galvanometer branch

Option B: minimum current flows through the galvanometer branch

Option C: potential difference across galvanometer branch is maximum

Option D: potential difference across galvanometer branch is zero

Correct Answer: potential difference across galvanometer branch is zero ✔

Option A: detect current in a circuit

Option B: measure current flowing through a circuit

Option C: measure voltage across a circuit

Option D: measure potential difference between two points in a circuit

Correct Answer: detect current in a circuit ✔

Option A: BINA cosa

Option B: BINA sina

Option C: BINA tana

Option D: BINA

Correct Answer: BINA ✔

Option A: 2.0 mA

Option B: 20 mA

Option C: 200 mA

Option D: 0.2 mA

Correct Answer: 2.0 mA ✔

Option A: shunt value decreases

Option B: shunt value increases

Option C: shunt value remains the same

Option D: none of the above

Correct Answer: shunt value decreases ✔

Option A: galvanometer

Option B: voltmeter

Option C: ammeter

Option D: AC transformer and DC generator

Correct Answer: AC transformer and DC generator ✔

Option A: zero

Option B: equal to the restoring couple

Option C: greater than the restoring couple

Option D: smaller than the restoring couple

Correct Answer: equal to the restoring couple ✔

Option A: voltmeter

Option B: galvanometer

Option C: cathode ray oscilloscope (CRO)

Option D: ammeter

Correct Answer: cathode ray oscilloscope (CRO) ✔

Option A: E = BeV

Option B: B = eE/V

Option C: E = BV

Option D: E = BeV/2

Correct Answer: E = BV ✔

Option A: M

Option B: L

Option C: H

Option D: B

Correct Answer: L ✔

Option A: NA-1m-1

Option B: NAm-1

Option C: NmA-1

Option D: NmA-2

Correct Answer: NA-1m-1 ✔

Option A: 1T = 103 G

Option B: 1T = 10-4 G

Option C: 1T = 10-2 G

Option D: 1T = 104 G

Correct Answer: 1T = 104 G ✔

Option A: air

Option B: steel

Option C: Cu-Ni alloy

Option D: soft iron

Correct Answer: soft iron ✔

Option A: always exerts a force on a charged particle

Option B: never exerts a force on a charged particles

Option C: exerts a force if the charged particle is moving in the direction of the magnetic field lines

Option D: exerts a force if the charged particle is moving perpendicular to the magnetic field lines

Correct Answer: exerts a force if the charged particle is moving perpendicular to the magnetic field lines ✔

Option A: repel each other

Option B: attract each other

Option C: have no effect upon each other

Option D: they cancel out their individual magnetic fields

Correct Answer: repel each other ✔

Option A: 1A

Option B: 10A

Option C: 100A

Option D: 1000A

Correct Answer: 100A ✔

Option A: magnetic flux

Option B: magnetic field intensity

Option C: magnetic induction

Option D: self inductance

Correct Answer: magnetic induction ✔