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 has the lowest electrical resistivity?
(a) Nickel
(b) Aluminium
(c) Silver
(d) Nichrome
Option c – Silver
Which one of the following statements is not correct?
(a) The SI unit of charge is ampere second.
(b) Debye is the unit of dipole moment.
(c) The resistivity of a wire of length / and area of cross-section A depends upon both / and A.
(d) The kinetic energy of an electron of mass m kilogram and charge e coulomb, when accelerated through a potential difference of V volt is eV joule.
Option c – The resistivity of a wire of length / and area of cross-section A depends upon both / and A
Which one of the following physical quantities does not affect the resistance of a cylindrical resistor?
(a) The current through it.
(b) Its length.
(c) The resistivity of the material used in the resistor.
(d) The area of the cross-section of the cylinder.
Option a – The current through it
A wire-bound standard resistor uses manganin or constantan. It is because
(a) these alloys are cheap and easily available.
(b) they have high resistivity.
(c) they have low resistivity.
(d) they have resistivity which almost remains unchanged with temperature.
Option d – they have resistivity which almost remains unchanged with temperature
Which among the following is not a conductor of electricity?
(a) Mercury
(b) Manganese
(c) Iron
(d) Ebonite
Option d – Ebonite
At low temperatures, lead behaves as a
(a) semiconductor
(b) superconductor
(c) insulator
(d) conductor
Option b – superconductor
Which one of the following is a good electrical conductor?
(a) Graphite
(b) Diamond
(c) Peat
(d) Charcoal
Option a – Graphite
The product of conductivity and resistivity of a conductor
(a) depends on the pressure applied.
(b) depends on the current flowing through the conductor.
(c) is the same for all conductors.
(d) varies from conductor to conductor.
Option c – is the same for all conductors
Of the two bulbs, one glows brighter than the other. Which bulb has a higher resistance?
(a) Brightness is independent of resistance.
(b) The bright bulb.
(c) Both have the same resistances.
(d) The dim bulb.
Option c – Both have the same resistances
Let us consider a copper wire having radius r and length /. Let its resistance be R. If the radius of another copper wire is 2r and the length is 1/2, then the resistance of this wire will be
(a) R
(b) 2R
(c) R/4
(d) R/8
Option d – R/8
The reciprocal of resistance is called
(a) electric conduction
(b) electric current
(c) electric potential
(d) None of the above
Option a – electric conduction
Two wires are made having the same length I and area of cross-section Wire 1 is made of copper and wire 2 is made of aluminum. It is given that the electrical conductivity of copper is more than that of aluminum. In this context, which one of the following statements is correct?
(a) The resistance of wire 1 will be higher than that of wire 2.
(b) The resistance of wire 2 will be higher than that of wire 1.
(c) The resistance of both wires will be the same.
(d) If the same current is flown through both wires, the power dissipated in both wires will be the same.
Option b – The resistance of wire 2 will be higher than that of wire 1
Consider the following statements. I. Ohm’s law is not applicable at very low and very high temperatures. II. Ohm’s law is applicable to semiconductors. III. Ohm’s law is not applicable to electron tubes, discharge tubes, and electrolytes. IV. Conductance is the reciprocal of resistance and is measured in siemens. Which of the statements given above is 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
Wires in our homes are made of metal because metals are
(a) good conductors of electricity.
(b) cheap and the wires are long.
(c) easily available.
(d) conveniently covered by insulators.
Option a – good conductors of electricity
Which one of the following statements is correct with regard to the material of electrical insulators?
(a) They contain no electrons.
(b) Electrons do not flow easily through them.
(c) They are crystals.
(d) They have more electrons than protons on their surface.
Option b – Electrons do not flow easily through them
Assertion (A) Bending a wire does not affect electrical resistance. Reason (R) Resistance wire is proportional to the resistivity of materials. Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of 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 is not the correct explanation of A
When two resistors are connected in parallel, have ………
(a) same current
(b) same potential difference
(c) different potential difference
(d) Both the same current and different potential difference
Option b – same potential difference
When resistors are connected in series, then net resistance ……….
(a) increases
(b) decreases
(c) remains same
(d) None of these
Option a – increases
If electric resistance is to be decreased, then the number of resistances should be connected in …….
(a) series
(b) parallel
(c) mixed arrangement
(d) None of the above
Option b – parallel
A conductor having some appreciable resistance is called an
(a) conductor
(b) insulator
(c) resistor
(d) semi-conductor
Option c – resistor
Superconductors are substances that
(a) conduct electricity at a lower temperature.
(b) offer high resistance to the flow of current.
(c) offer no resistance to the flow of current.
(d) conduct electricity at high temperature
Option c – offer no resistance to the flow of current
Find the resistance (in mega O) of a wire of length 10 m, cross-sectional area 1 cm², and made of a material of resistivity 100 Ohm.
(a) 1000
(b) 20
(c) 500
(d) 10
Option d – 10
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