Free MCQs & Online Quiz Practice for Exams

Q: A step-up transformer increases

A) Power

B) Energy

C) Voltage

D) Current

Q: A certain transformer has a primary winding with 500 turns and a secondary winding with 250 turns. The turns ratio is

A) 0.5

B) 2

C) 250

D) 750

Q: If the turns ratio is 5 the secondary voltage is greater than the primary voltage by a factor of

A) 0.2

B) 0.5

C) 2.5

D) 5

Q: When connected to a battery a lightbulb glows brightly. If the battery is reversed and reconnected to the bulb the bulb will glow

A) brighter

B) dimner

C) with the same brightness

D) and fuse

Q: The resistance of wire will decrease by increasing

A) temperature

B) length

C) diameter

D) both A & B

Q: The wire made from which of the following material is a conductor

A) glass

B) rubber

C) silver

D) silk

Q: The current which reverses direction after regular interval of time is

A) DC

B) AC

C) conventional current

D) both A and B

Q: Electricity main supply meters measure it in units of 'kilowatt-hour'; it is the unit of

A) charge

B) current

C) power

D) energy

Q: The device that is used to protect a circuit against overload is

A) heater

B) fuse

C) lamp

D) All of these

Q: Which of the following represent one ohm

A) VA⁻¹

B) JS⁻¹

C) WA⁻¹

D) JC⁻¹

Q: Two resistors of 1 ohm are connected in parallel the equivalent resistance is

A) 2 Ω

B) 0.5 Ω

C) 1 Ω

D) 1.5 Ω

Q: 1 kWh =

A) 3600 W

B) 1000 J

C) 3.6 × 10⁶ J

D) 0.36 hrs

Q: Cathode rays are beam of

A) Protons

B) Electrons

C) Ions

D) Neutrons

Q: If electric field is applied parallel to the direction of electron beam the electrons will

A) Speed up

B) Slow down

C) Deflect

D) Not change its state

Q: If magnetic field is applied parallel to the direction of electron beam the electrons will

A) Speed up

B) Slow down

C) Deflect

D) Not change its state

Q: The electronic circuit that gives high (1) output when all its input are high (1) is called ___ gate

A) AND

B) OR

C) NAND

D) NOR

Q: The electronic circuit that gives high (1) output when one or more of its input are high (1) is called ___ gate

A) AND

B) OR

C) NAND

D) NOR

Q: The electronic circuit that gives low (0) output when one or more of its input are high (1) is called ___ gate

A) AND

B) OR

C) NAND

D) NOR

Q: The Boolean equation for OR gate is

A) X=AB

B) X=A+B

C) X=AB

D) X=A+B

Q: The Boolean equation for NAND gate is

A) X=AB

B) X=A+B

C) X=A̅B̅

D) X=A+B