Free MCQs & Online Quiz Practice for Exams

Q: An alternating quantity (voltage or current) is completely known if we know its:

A) Maximum value

B) Frequency and phase

C) Effective value

D) Both maximum value and frequency

Q: For electromagnetic waves, Maxwell generalized:

A) Gauss's law for magnetism

B) Gauss's law for electricity

C) Faraday's law

D) Amperes law

Q: An electromagnetic wave goes from air to glass. Which of the following does not change?:

A) Radio waves

B) X-rays

C) Ultra violet radiation

D) Ultra sound waves

Q: In a circuit in which current and voltage are in phase, the power factor is:

A) Zero

B) 1

C) -1

D) 2

Q: With increase in frequency of an AC supply, the impedance of an RLC series circuit:

A) Remains constant

B) Increases

C) Decreases

D) Capacitive reactance X_C decreases only

Q: The shear modulus of elasticity G is:

A) AL/F₀

B) FU/A₀

C) F/Aθ

D) AL/F

Q: The temperature at which a material becomes superconducting is called:

A) Knee temperature

B) Critical temperature

C) Absolute temperature

D) Zero temperature

Q: Which of the following is not a ferromagnetic material?:

A) Iron

B) Nickel

C) Cobalt

D) Barium

Q: The ratio of stress to strain is:

A) 0

B) >1

C) Constant

D) <1

Q: Which of the modulus of elasticity is involved in compressing a rod to decrease its length?:

A) Young's modulus

B) Bulk modulus

C) Modulus of elasticity

D) Fracture

Q: If both the length and radius of the rod are doubled, then the modulus of elasticity will:

A) Increase

B) Decrease

C) Remain the same

D) Doubled

Q: Curie temperature is a point where:

A) Diamagnetism changes to paramagnetism

B) Paramagnetism changes to diamagnetism

C) Ferromagnetism changes to paramagnetism

D) Paramagnetism changes to ferromagnetism

Q: A cable breaks if stretched by more than 2 mm. It is cut into two equal parts. How much either part can be stretched without breaking?:

A) 0.25 m

B) 1 mm

C) 2 mm

D) 0.5 m

Q: In an N-type silicon, which of the following statement is true:

A) Electrons are majority carriers and trivalent atoms are the dopants

B) Electrons are minority carriers and pentavalent atoms are the dopants

C) Holes are minority carriers and pentavalent atoms are the dopants

D) Holes are majority carriers and trivalent atoms are the dopants

Q: The barrier potential of a silicon diode at room temperature is:

A) 0.3 V

B) 0.7 V

C) 0.9 V

D) 1.0 V

Q: For common emitter configuration of NPN transistor, current gain is given by:

A) Ic/Ib

B) Ib/Ic

C) IE/IB

D) IG/IE

Q: The reverse saturation current in a PN junction diode is only due to:

A) Majority carriers

B) Minority carriers

C) Acceptor ions

D) Donor ions

Q: PN junction when reversed biased acts as:

A) Capacitor

B) ON switch

C) Inductor

D) OFF switch

Q: Improper biasing of a transistor circuit produces:

A) Heavy loading of emitter current

B) Distortion in the output signal

C) Excessive heat at collector terminal

D) Faulty location of load line

Q: When transistors are used in digital circuits they usually operate in the:

A) Active region

B) Breakdown region

C) Saturation and cutoff regions

D) Linear region