Basic Electrical MCQs

Option A: one watt

Option B: one joule

Option C: five joules

Option D: one joule second

Correct Answer: one joule ✔

Option A: 10-8 mm

Option B: 10″6 cm

Option C: 10″10 m

Option D: 10~14 m

Correct Answer: 10″10 m ✔

Option A: resistance : ohm

Option B: capacitance : henry

Option C: inductance : farad

Option D: lumen : steradian

Correct Answer: resistance : ohm ✔

Option A: Compounds of silver

Option B: Liquid metals

Option C: Metallic alloys

Option D: Electrolytes

Correct Answer: Electrolytes ✔

Option A: 1 n-mho

Option B: 106 mho

Option C: 1 milli-mho

Option D: none of the above

Correct Answer: 1 n-mho ✔

Option A: lead and zinc

Option B: chromium and vanadium

Option C: nickel and chromium

Option D: copper and silver

Correct Answer: nickel and chromium ✔

Option A: I2Rt

Option B: I2Rf

Option C: I2R2t

Option D: I2R2t*

Correct Answer: I2Rt ✔

Option A: positive temperature coefficient

Option B: negative temperature coefficient

Option C: zero temperature coefficient

Option D: variable temperature coefficient

Correct Answer: zero temperature coefficient ✔

Option A: 10 W

Option B: 20 W

Option C: 40 W

Option D: 60 W

Correct Answer: 60 W ✔

Option A: 3

Option B: 4

Option C: 6

Option D: 7

Correct Answer: 4 ✔

Option A: 1840

Option B: 1840

Option C: 30

Option D: 4

Correct Answer: 1840 ✔

Option A: for inductive circuits

Option B: to supress surges

Option C: as heating elements

Option D: as current stabilizers

Correct Answer: to supress surges ✔

Option A: Charcoal

Option B: Silicon Carbide

Option C: Nichrome

Option D: Graphite

Correct Answer: Silicon Carbide ✔

Option A: conductance

Option B: resistance

Option C: reluctance

Option D: thermal conductivity

Correct Answer: conductance ✔

Option A: Varistors

Option B: Thermistor

Option C: Semi-conductors

Option D: Variable resistors

Correct Answer: Semi-conductors ✔

Option A: zero

Option B: infinite

Option C: high but within tolerance

Option D: low but not zero

Correct Answer: infinite ✔

Option A: has lower wattage rating

Option B: has higher wattage rating

Option C: has large number of turns

Option D: offers large number of tapping

Correct Answer: has higher wattage rating ✔

Option A: A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator

Option B: A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator

Option C: A semi-conductor is one which con¬ducts only half of the applied voltage

Option D: A semi-conductor is a material made of alternate layers of conducting material and insulator

Correct Answer: A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator ✔

Option A: resistance must be uniform

Option B: current should be proportional to the size of the resistance

Option C: resistance must be wire wound type

Option D: temperature at positive end should be more than the temperature at negative end

Correct Answer: resistance must be uniform ✔

Option A: current through supply line flows at slower speed

Option B: supply wiring is covered with insulation layer

Option C: resistance of heater coil is more than the supply wires

Option D: supply wires are made of superior material

Correct Answer: resistance of heater coil is more than the supply wires ✔

Option A: ohms/°C

Option B: mhos/ohm°C

Option C: ohms/ohm°C

Option D: mhos/°C

Correct Answer: ohms/ohm°C ✔

Option A: 80 m

Option B: 60 m

Option C: 40 m

Option D: 20 m

Correct Answer: 20 m ✔

Option A: 160 ohms

Option B: 80 ohms

Option C: 20 ohms

Option D: 10 ohms

Correct Answer: 10 ohms ✔

Option A: semi-conductors

Option B: D. C. circuits

Option C: small resistors

Option D: high currents

Correct Answer: semi-conductors ✔

Option A: Lorentz method

Option B: Releigh method

Option C: Ohm’s law method

Option D: Wheatstone bridge method

Correct Answer: Lorentz method ✔

Option A: 3/2 Q

Option B: 6 Q

Option C: 4 Q

Option D: 8/3 Q

Correct Answer: 4 Q ✔

Option A: 9 times

Option B: 1/9 times

Option C: 1/3 times

Option D: 3 times

Correct Answer: 9 times ✔

Option A: a column of mercury

Option B: a cube of carbon

Option C: a cube of copper

Option D: the unit length of wire

Correct Answer: a column of mercury ✔

Option A: semi-conductor

Option B: super-conducto

Option C: compound

Option D: insulator

Correct Answer: compound ✔

Option A: two molecules

Option B: two ions

Option C: two atoms

Option D: two metal particles

Correct Answer: two ions ✔

Option A: decrease

Option B: increase

Option C: remain constant

Option D: none of the above

Correct Answer: increase ✔

Option A: 1/9 times

Option B: 3 times

Option C: 9 times

Option D: unchanged

Correct Answer: 9 times ✔

Option A: resistance

Option B: inductance

Option C: capacitance

Option D: impedance

Correct Answer: inductance ✔

Option A: arcs across separating contacts

Option B: mechanical noise of high intensity

Option C: both mechanical noise and arc between contacts

Option D: none of the above

Correct Answer: arcs across separating contacts ✔

Option A: very low

Option B: low

Option C: high

Option D: any value

Correct Answer: high ✔

Option A: parallel

Option B: series

Option C: series-parallel

Option D: end-to-end

Correct Answer: parallel ✔

Option A: A. C.

Option B: D. C.

Option C: any of above two

Option D: none of the above

Correct Answer: B. D. C. ✔

Option A: magnitude and direction of current remains constant

Option B: magnitude and direction of current changes with time

Option C: magnitude of current changes with time

Option D: magnitude of current remains constant

Correct Answer: magnitude and direction of current remains constant ✔

Option A: 100 W lamp will glow brighter

Option B: 40 W lamp will glow brighter

Option C: Both lamps will glow equally bright

Option D: 40 W lamp will fuse

Correct Answer: 40 W lamp will glow brighter ✔

Option A: increases

Option B: decreases

Option C: remains same

Option D: none of the above

Correct Answer: decreases ✔

Option A: reduce

Option B: increase

Option C: decrease

Option D: become zero

Correct Answer: decrease ✔

Option A: any electron from the orbit

Option B: first electron from the orbit

Option C: second electron from the orbit

Option D: third electron from the orbit

Correct Answer: third electron from the orbit ✔

Option A: Reactor

Option B: Capacitor

Option C: Inductor

Option D: Resistor

Correct Answer: Resistor ✔

Option A: it takes in proton

Option B: its atoms are removed

Option C: it gives away electrons

Option D: it gives away positive charge

Correct Answer: it gives away electrons ✔

Option A: 4 : 25

Option B: 25 : 4

Option C: 2 : 5

Option D: 5 : 2

Correct Answer: 2 : 5 ✔

Option A: collisions between conduction electrons and atoms

Option B: the release of conduction electrons from parent atoms

Option C: mutual collisions between metal atoms

Option D: mutual collisions between conducting electrons

Correct Answer: collisions between conduction electrons and atoms ✔

Option A: Input power

Option B: Losses

Option C: True component of power

Option D: kWh consumed

Correct Answer: Losses ✔

Option A: temperature of material is decreased

Option B: temperature of material is increased

Option C: number of free electrons available become more

Option D: none of the above is correct

Correct Answer: number of free electrons available become more ✔

Option A: magnetic effect

Option B: luminous effect

Option C: thermal effect

Option D: chemical effect

Correct Answer: all above effects ✔

Option A: D. C. supply only

Option B: A. C. supply only

Option C: Battery supply only

Option D: All above

Correct Answer: All above ✔

Option A: length of heating element should be decreased

Option B: length of heating element should be increased

Option C: length of heating element has no effect on heating if water

Option D: none of the above

Correct Answer: length of heating element should be decreased ✔

Option A: decrease

Option B: increase

Option C: remain same

Option D: heater will burn out

Correct Answer: increase ✔

Option A: Voltage

Option B: Current

Option C: Power

Option D: Resistance

Correct Answer: Current ✔

Option A: the magnitude of voltage on the conductor

Option B: the magnitude of current flowing through it

Option C: both A. and (b)

Option D: none of the above

Correct Answer: the magnitude of voltage on the conductor ✔

Option A: to prevent leakage of current

Option B: to prevent shock

Option C: both of above factors

Option D: none of above factors

Correct Answer: both of above factors ✔

Option A: zero

Option B: negative

Option C: positive

Option D: about 2 ohms per degree

Correct Answer: positive ✔

Option A: zero

Option B: about 50 ohms

Option C: about 500 ohms

Option D: infinity

Correct Answer: zero ✔

Option A: Rl

Option B: Ri

Option C: either Rl or Ri

Option D: none of them

Correct Answer: Rl ✔

Option A: The current through each bulb in same

Option B: The voltage across each bulb is not same

Option C: The power dissipation in each bulb is not same

Option D: None of the above

Correct Answer: The current through each bulb in same ✔

Option A: there will be heavy current in the main line

Option B: rest of the two bulbs will not light

Option C: all three bulbs will light

Option D: the other two bulbs will light

Correct Answer: the other two bulbs will light ✔

Option A: 0.4 ohm

Option B: 0.6 ohm

Option C: 0.8 ohm

Option D: 1.0 ohm

Correct Answer: 0.4 ohm ✔

Option A: increases in the branch of the lowest resistance

Option B: increases in each branch

Option C: is zero in all branches

Option D: is zero in the highest resistive branch

Correct Answer: is zero in all branches ✔

Option A: practically zero

Option B: low

Option C: high

Option D: very high

Correct Answer: practically zero ✔

Option A: A galvanometer with low resistance in parallel is a voltmeter

Option B: A galvanometer with high resistance in parallel is a voltmeter

Option C: A galvanometer with low resistance in series is an ammeter

Option D: A galvanometer with high resistance in series is an ammeter

Correct Answer: A galvanometer with low resistance in series is an ammeter ✔

Option A: 2 watts

Option B: 4 watts

Option C: 6 watts

Option D: 12 watts

Correct Answer: 2 watts ✔

Option A: carbon

Option B: aluminium

Option C: tungsten

Option D: nickel

Correct Answer: tungsten ✔

Option A: the highest resistance has the most of the current through it

Option B: the lowest resistance has the highest voltage drop

Option C: the lowest resistance has the highest current

Option D: the highest resistance has the highest voltage drop

Correct Answer: the highest resistance has the highest voltage drop ✔

A. equal to the atomic number of the atom
B. equal to the charge of an electron
C. equal to the charge of the number of electrons in an atom (#) zero

Correct Answer: equal to the charge of an electron ✔

Option A: ampere-hours

Option B: ampere-volts

Option C: kWh

Option D: amperes

Correct Answer: amperes ✔

Option A: preventing a short circuit between conducting wires

Option B: preventing an open circuit between the voltage source and the load

Option C: conducting very large currents

Option D: storing very high currents

Correct Answer: preventing an open circuit between the voltage source and the load ✔

Option A: preventing a short circuit between conducting wires

Option B: preventing an open circuit between the voltage source and the load

Option C: conducting very large currents

Option D: storing very high currents

Correct Answer: preventing a short circuit between conducting wires ✔

Option A: insulators

Option B: non-linear resistors

Option C: carbon resistors

Option D: resistors with zero temperature coefficient

Correct Answer: non-linear resistors ✔

Option A: Aluminium

Option B: Paper

Option C: Rubber

Option D: Mica

Correct Answer: Aluminium ✔

Option A: metallic resistor

Option B: carbon resistor

Option C: wire wound resistor

Option D: variable resistor

Correct Answer: wire wound resistor ✔

Option A: (amperes) ohm

Option B: joules/seC.

Option C: amperes x volts

Option D: amperes/volt

Correct Answer: amperes/volt ✔

Option A: Reluctance

Option B: Charge

Option C: Power

Option D: Energy

Correct Answer: Charge ✔

Option A: Iron

Option B: Silver

Option C: Copper

Option D: Carbon

Correct Answer: Silver ✔

Option A: vacuum tubes

Option B: carbon resistors

Option C: high voltage circuits

Option D: circuits with low current densities

Correct Answer: vacuum tubes ✔

Option A: Copper

Option B: Aluminum

Option C: Carbon

Option D: Brass

Correct Answer: Carbon ✔

Option A: Elements have individual currents

Option B: Currents are additive

Option C: Voltages are additive

Option D: Power are additive

Correct Answer: Power are additive ✔

Option A: same current passes in turn through both

Option B: both carry the same value of current

Option C: total current equals the sum of branch currents

Option D: sum of IR drops equals the applied e.m.f.

Correct Answer: same current passes in turn through both ✔

Option A: two in parallel

Option B: two in parallel and one in series

Option C: three in parallel

Option D: three in series

Correct Answer: two in parallel ✔

Option A: Manganin

Option B: Porcelain

Option C: Carbon

Option D: Copper

Correct Answer: Manganin ✔

Option A: the same as propagation velocity of electric energy

Option B: independent of current strength

Option C: of the order of a few ^.s/m

Option D: nearly 3 x 108 m/s

Correct Answer: of the order of a few ^.s/m ✔

Option A: 6.4 A, 6.9 A

Option B: 6.4 A, 9.6 A

Option C: 4.6 A, 6.9 A

Option D: 4.6 A, 9.6 A

Correct Answer: 6.4 A, 9.6 A ✔

Option A: 100 Ω

Option B: 200 Ω

Option C: 300 Ω

Option D: 400 Ω

Correct Answer: 400 Ω ✔

Option A: 18 Q

Option B: 36 Q

Option C: 48 Q

Option D: 64 Q

Correct Answer: 36 Q ✔

Option A: 400 Q

Option B: 600 Q

Option C: 800 Q

Option D: 1000 Q

Correct Answer: 800 Q ✔

Option A: 33 V

Option B: 66 v

Option C: 80 V

Option D: 132 V

Correct Answer: 66 v ✔

Option A: voltmeter

Option B: rheostat

Option C: wattmeter

Option D: galvanometer

Correct Answer: galvanometer ✔

Option A: 1.2 x 10~8 Q-m

Option B: 1.4 x 10~8 Q-m

Option C: 1.6 x 10″”8 Q-m

Option D: 1.8 x 10″8 Q-m

Correct Answer: 1.6 x 10″”8 Q-m ✔

Option A: decreases

Option B: increases

Option C: first increases and then decreases

Option D: remains constant

Correct Answer: decreases ✔

Option A: increases

Option B: decreases

Option C: first increases and then decreases

Option D: remains constant

Correct Answer: increases ✔

Option A: length

Option B: area of cross-section

Option C: temperature

Option D: resistivity

Correct Answer: area of cross-section ✔

Option A: resistance

Option B: inductance

Option C: reluctance

Option D: capacitance

Correct Answer: resistance ✔

Option A: resistance

Option B: reluctance

Option C: conductance

Option D: inductance

Correct Answer: conductance ✔

Option A: Copper

Option B: Gold

Option C: Silver

Option D: Paper

Correct Answer: Paper ✔

Option A: Cast iron

Option B: Copper

Option C: Carbon

Option D: Tungsten

Correct Answer: Copper ✔

Option A: insulators

Option B: inductors

Option C: semi-conductors

Option D: conductors

Correct Answer: conductors ✔

Option A: resistance

Option B: power

Option C: voltage

Option D: energy

Correct Answer: voltage ✔