Free MCQs & Online Quiz Practice for Exams

Q: Thermocouple is an arrangement of two different metals to:

A) convert heat energy into electrical energy

B) produce more heat

C) convert heat energy into chemical energy

D) convert electric energy into heat energy

Q: In order to achieve high accuracy, the slide of a potentiometer wire should be:

A) as long as possible

B) as short as possible

C) very thin

D) very thick

Q: When a potentiometer is used for measurement of voltage of an unknown source, the power consumed in the circuit of the unknown source under null condition is:

A) high

B) small

C) ideally zero

D) very high

Q: In a Wheatstone bridge method, the bridge is said to be balanced when the current through the galvanometer is:

A) 1 A

B) 0 A

C) Maximum

D) Half of the maximum value

Q: Current is flowing North in a magnetic field that points West. It experiences:

A) A force down

B) A force up

C) A force west

D) No force

Q: Two long, straight wires have currents flowing in them in the same direction. The force between the wires is:

A) Attractive

B) Repulsive

C) Zero

D) Infinite

Q: One weber is equal to:

A) N·A·m²

B) N·m²/A

C) N·A/m

D) N·m/A

Q: Magnetic flux will be maximum if the angle between magnetic field strength and vector area is:

A) 0°

B) 60°

C) 90°

D) 180°

Q: Ampere's law is applied over any:

A) Surface

B) Closed surface

C) Path

D) Closed path

Q: When the number of turns in a solenoid is doubled without any change in the length of the solenoid, its self-induction will be:

A) Four times

B) Doubled

C) Halved

D) One fourth

Q: Work done on a charged particle moving in a uniform magnetic field is:

A) Maximum

B) Minimum

C) Zero

D) Infinite

Q: The Earth's northern magnetic pole acts like:

A) The north pole of a magnet

B) The south pole of a magnet

C) It has a positive charge

D) It has a negative charge

Q: The pole pieces of the magnet in a galvanometer are made concave to make the field:

A) Radial

B) Stronger

C) Weaker

D) Both A & B

Q: When a small resistance is connected parallel to galvanometer, the resulting circuit behaves as:

A) Voltmeter

B) Ammeter

C) Velocity Selector

D) AVO meter

Q: To measure the voltage, the voltmeter is connected with the circuit in:

A) Series

B) Parallel

C) Perpendicular

D) Straight line

Q: The resistance of an ideal voltmeter is:

A) Small

B) Large

C) Zero

D) Infinite

Q: The torque in the coil can be increased by increasing:

A) Number of turns

B) Current and magnetic field

C) Area of coil

D) All of these

Q: For inducing e.m.f. in a coil the basic requirement is that:

A) Flux should link the coil

B) Change in flux should link the coil

C) Coil should form a closed loop

D) Both B and C

Q: When a single turn coil rotates in a uniform magnetic field at uniform speed, the induced e.m.f. will be:

A) Alternating

B) Steady

C) Pulsating

D) Zero

Q: Principle of dynamically induced e.m.f. is used in a:

A) Choke

B) Transformer

C) Generator

D) Thermocouple