MATRIC • FSC • NTS • ETEA • CSS • PMS etc MCQs Learn, Practice, Prepare, Succeed! Prepare Today, Succeed Tomorrow!

Q: In CRO, the time-base circuit is connected to: (Entry test 2010)

A) Vertical plates

B) Electron gun

C) Horizontal plates

D) Fluorescent screen

Q: A wire of length 10 cm lying normal to a magnetic field of 0.5 T experiences a force of 5 N. The current in the wire is: (Entry test 2010)

A) 10 A

B) 50 A

C) 100 A

D) 500 A

Q: The SI unit of magnetic flux is Weber which is equal to: (Entry test 2011)

A) N m A⁰

B) N m² A⁻¹

C) N A m⁻¹

D) N m A⁻²

Q: Two parallel metallic wires carry currents in the same direction. The wires will: (Entry test 2011)

A) Attract each other

B) Repel each other

C) No force

D) Remain stationary

Q: When a charged particle enters a uniform magnetic field, which quantity changes? (Entry test 2011)

A) Kinetic energy

B) Magnitude of velocity

C) Direction of velocity

D) All of these

Q: If the initial velocity of a charged particle is neither along nor perpendicular to the magnetic field, its path will be: (Entry test 2011)

A) Circle

B) Helix

C) Ellipse

D) Straight line

Q: The unit henry is equivalent to: (Entry test 2009)

A) Volt-second/ampere

B) Volt/second

C) Ohm

D) Ampere volt/second

Q: The phenomenon used for producing emf in the coil of a generator is: (Entry test 2009)

A) Mutual induction

B) Self induction

C) Electrostatic induction

D) Electromagnetic induction

Q: A Wheatstone bridge is used to determine an unknown: (ETEA 1998)

A) Current

B) Charge

C) Resistance

D) EMF

Q: Ohm × Farad is equal to: (Entry test 2011)

A) Second

B) Weber

C) Henry

D) Tesla

Q: The device used for detection and measurement of electric current is called: (Entry test 2002)

A) Transformer

B) Amplifier

C) Rectifier

D) Galvanometer

Q: A flat coil of wire having 5 turns has inductance L. The inductance of a similar coil having 20 turns is: (Entry test 2015)

A) 4L

B) 1/4 L

C) μL

D) L

Q: The changing electric flux in a certain region of space produces (Entry test 2016)

A) An electric field

B) Magnetic field

C) Both a and b

D) None

Q: Instantaneous emf E = 20 sin(100πt). The frequency of the alternating current is (Entry test 2015)

A) 100 Hz

B) 200 Hz

C) 50 Hz

D) 150 Hz

Q: The capacitive reactance of an AC circuit increases (Entry test 2010)

A) By increasing the frequency of AC voltage

B) By decreasing the frequency of AC voltage

C) Does not depend upon the frequency of AC voltage

D) None of these

Q: The inductive reactance of a coil having inductance 0.5 Henry in which AC of 50 Hz flows is (Entry test 2011)

A) 94.2Ω

B) 1.57Ω

C) 157Ω

D) 9.42Ω

Q: When the frequency of an AC source is very low, an RLC series circuit behaves as a (Entry test 2011)

A) Resistive circuit

B) Inductive circuit

C) Capacitive circuit

D) Resonant circuit

Q: The waveform, its frequency and phase of a sinusoidal voltage can be found by (Entry test 2012)

A) CRO

B) Diode

C) Transistor

D) Radio

Q: The sinusoidal AC current I = 50 sin(20t). The peak value of current is (Entry test 2012)

A) 100 A

B) 25 A

C) 50 A

D) 20 A

Q: In vacuum all electromagnetic waves have the same (Entry test 2014)

A) Speed

B) Energy

C) Frequency

D) Wavelength