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Electrical power Generation mcq. We covered all the Electrical power Generation mcq in this post for free so that you can practice well for the exam.
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mcq on Electrical power generation for Students
Which of the following materials has the least electrical resistivity?
a) Nickel
b) Aluminium
c) Silver
d) Nichrome
Option c – Silver
Which of the following statements is incorrect?
a) The SI unit of electric charge is ampere second.
b) Debye is used as a unit of dipole moment.
c) The resistivity of a wire depends on its length and area of cross-section.
d) The kinetic energy of an electron of Mass m and charge e, accelerated through a potential difference V, is eV joules.
Option c – The resistivity of a wire depends on its length and area of cross-section.
Which of the following factors does not affect the resistance of a cylindrical resistor?
a) The current passing through it
b) Its length
c) The resistivity of the material used
d) The cross-sectional area of the cylinder
Option a – The current passing through it
A wire-wound standard resistor uses manganin or constantan because
a) these alloys are cheap and easily available
b) they have high resistivity
c) they have low resistivity
d) their resistivity remains nearly constant with temperature
Option d – their resistivity remains nearly constant with temperature
Which of the following is not a good conductor of Electricity?
a) Mercury
b) Manganese
c) Iron
d) Ebonite
Option d – Ebonite
At low temperatures, lead acts as a
a) semiconductor
b) superconductor
c) insulator
d) conductor
Option b – superconductor
Which of the following is a good conductor of Electricity?
a) Graphite
b) Diamond
c) Peat
d) Charcoal
Option a – Graphite
The product of a conductor’s conductivity and resistivity
a) depends on applied pressure
b) depends on current passing through it
c) remains constant for all conductors
d) varies from one conductor to another
Option c – remains constant for all conductors
Two bulbs glow with different brightness. Which one has a higher resistance?
a) Brightness is not related to resistance
b) The brighter bulb
c) Both have equal resistance
d) The dimmer bulb
Option c – Both have equal resistance
A copper wire of radius r and length l has resistance R. If another copper wire has radius 2r and length l/2, its resistance will be
a) R
b) 2R
c) R/4
d) R/8
Option d – R/8
The reciprocal of electrical resistance is called
a) electrical conductance
b) electric current
c) electric potential
d) None of these
Option a – electrical conductance
Two wires of the same length and cross-sectional area are made of copper and aluminium. If copper has greater conductivity, then
a) the copper wire will have higher resistance
b) the aluminium wire will have higher resistance
c) both will have equal resistance
d) power dissipation in both will be the same for equal current
Option b – the aluminium wire will have higher resistance
Consider the statements: I. Ohm’s law fails at very high and very low temperatures. II. Ohm’s law applies to semiconductors. III. It does not apply to electron tubes, discharge tubes, and electrolytes. IV. Conductance is the reciprocal of resistance and is measured in siemens. Which of these statements are correct?
a) I, II and III
b) I, II and IV
c) I, III and IV
d) I, II, III and IV
Option c – I, III and IV
The wires used in household circuits are made of Metals because Metals are
a) good conductors of Electricity
b) cheap and long
c) easily available
d) easily covered with insulation
Option a – good conductors of Electricity
Which of the following correctly describes electrical insulators?
a) They have no electrons
b) Electrons do not move easily through them
c) They are crystalline substances
d) Their surface contains more electrons than protons
Option b – Electrons do not move easily through them
Assertion (A): Bending a wire does not affect its electrical resistance. Reason (R): Resistance of a wire is proportional to the resistivity of the material.
a) Both A and R are true and R correctly explains A
b) Both A and R are true, but R does not correctly explain A
c) A is true, but R is false
d) A is false, but R is true
Option b – Both A and R are true, but R does not correctly explain A
When two resistors are connected in parallel, they have
a) same current
b) same potential difference
c) different potential difference
d) both same current and different potential difference
Option b – same potential difference
When resistors are connected in series, the total resistance
a) increases
b) decreases
c) remains unchanged
d) None of these
Option a – increases
To reduce total resistance, resistors should be connected in
a) series
b) parallel
c) mixed combination
d) None of the above
Option b – parallel
A conductor with a measurable amount of resistance is called a
a) conductor
b) insulator
c) resistor
d) semiconductor
Option c – resistor
Superconductors are materials that
a) conduct Electricity only at low temperatures
b) have very high resistance to current flow
c) allow current to pass without resistance
d) conduct well at high temperatures
Option c – allow current to pass without resistance
The resistance (in mega-ohms) of a wire of length 10 m, cross-sectional area 1 cm², and resistivity 100 ohm-m is
a) 1000
b) 20
c) 500
d) 10
Option d – 10
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