Current Electricity Class 12 MCQ. We covered all the Current Electricity Class 12 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Current Electricity for Class 12 Students
The frequency of A.C. mains in India is
(a) 30 Hz
(b) 50 Hz
(c) 60 Hz
(d) 120 Hz
Option b – 50 Hz
Electric iron uses wires of alloy as
(a) they do not oxidise at high temperatures
(b) they do not burn at high temperatures
(c) both (a) and (b)
(d) neither (a) nor (b)
Option c – both (a) and (b)
The parameters of electricity supply in India are
(a) Potential Difference of 220 V, Frequency of 50 hertz and Current Rating of 5A/15A
(b) Potential Difference of 150 V, Frequency of 40 hertz and Current Rating of 10 A
(c) Potential Difference of 220 V, Frequency of 60 hertz and Current Rating of 15A
(d) Potential Difference of 220 V, Frequency of 40 hertz and Current Rating of 5 A
Option a – Potential Difference of 220 V, Frequency of 50 hertz and Current Rating of 5A/15A
The earth’s magnetic field always has a vertical component except at the
(a) magnetic equator
(b) magnetic poles
(c) geographic north pole
(d) latitude 45°
Option a – magnetic equator
Domestic electrical wiring is basically an
(a) series connection
(b) parallel connection
(c) combination of series and parallel connections
(d) series connection within each room and parallel connection elsewhere
Option b – parallel connection
What should be the characteristic of fuse wire?
(a) High melting point, high specific resistance
(b) Low melting point, low specific resistance
(c) High melting point, low specific resistance
(d) Low melting point, high specific resistance
Option d – Low melting point, high specific resistance
The heating element of an electric heater should be made with a material, which should have
(a) high specific resistance and high melting point
(b) high specific resistance and low melting point
(c) low specific resistance and low melting point
(d) low specific resistance and high melting point
Option a – high specific resistance and high melting point
Of the two bulbs in a house, one glows brighter than the other. Which of the two has a large resistance?
(a) The bright bulb
(b) The dim bulb
(c) Both have the same resistance
(d) The brightness does not depend upon the resistance
Option b – The dim bulb
The magnet is strongest near the
(a) poles of the magnet
(b) only the south pole of the magnet
(c) centre of the magnet
(d) on the equator point from the poles of the magnet
Option a – poles of the magnet
When an electrical safety fuse is rated (marked) as 16 A, it means it
(a) will not work if the current is less than 16 A
(b) has a resistance of 16 W
(c) will work if the temperature is more than 16°C
(d) will be blown (break) if the current exceeds 16 A
Option d – will be blown (break) if the current exceeds 16 A
At the time of a short circuit, the current in the circuit
(a) vary continuously
(b) increases heavily
(c) decreases substantially
(d) does not change
Option b – increases heavily
Lenz’s law is a consequence of the law of conservation of
(a) Charge
(b) Momentum
(c) Energy
(d) Mass
Option c – Energy
A magnetic field can be produced by
(a) A moving charge only
(b) A changing electric field only
(c) Both of these
(d) None of the above
Option c – Both of these
How many units of electricity will be consumed if you use a 60-watt electric bulb for 5 hours every day for 30 days?
(a) 12
(b) 9
(c) 6
(d) 3
Option b – 9
Consider the following statements and select the correct code. Assertion (A): The temperature of a metal wire rises when an electric current is passed through it. Reason (R): Collision of metal atoms with each other releases heat energy. 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 a – Both A and R are true and R is the correct explanation of A
Consider the following statements and select the correct code. Assertion (A): In our houses, the current in the A.C. electricity line changes direction 60 times per second. Reason (R): The frequency of the alternating voltage supplied is 50 Hz. Codes :
(a) Both A and R are correct and R is the correct explanation of A.
(b) Both A and R are correct, 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 d – A is false, but R is true
In electromagnetic induction, the induced charge does not depend on
(a) Change in flux
(b) Time of change of magnetic flux
(c) Resistance of Coil
(d) None of the above
Option b – Time of change of magnetic flux
At temperature 0K, the germanium behaves as a / an
(a) conductor
(b) insulator
(c) super-conductor
(d) ferromagnetic
Option b – insulator
Appropriate material to be used in the construction of resistance boxes out of the following is
(a) copper
(b) iron
(c) manganin
(d) aluminium
Option c – manganin
If the temperature is decreased, then the relaxation time of electrons in metals will
(a) increase
(b) decrease
(c) fluctuate
(d) remains constant
Option a – increase
The transformer is used
(a) for converting AC into DC
(b) for converting DC into AC
(c) to step up DC voltages
(d) to step up or step down AC voltages
Option d – to step up or step down AC voltages
Which of the following is the best conductor of electricity?
(a) Aluminium
(b) Copper
(c) Silver
(d) Gold
Option c – Silver
Constantan wire is used for making standard resistance because it has
(a) a high melting point
(b) low specific resistance
(c) high specific resistance
(d) negligible temperature coefficient of resistance
Option d – negligible temperature coefficient of resistance
A piece of copper and another of germanium are cooled from room temperature to 80° K. The resistance of
(a) each of them increases
(b) each of them decreases
(c) copper increases and germanium decreases
(d) copper decreases and germanium increases
Option d – copper decreases and germanium increases
Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?
(a) Drift speed
(b) Resistivity
(c) Resistance
(d) Number of free electrons
Option d – Number of free electrons
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