Alternating Current Class 12 MCQ. We covered all the Alternating Current Class 12 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Alternating Current for Class 12th Students
Electrons generally follow the straight-line path between two successive collisions in a metal. The statement is
(A) incorrect.
(B) correct in absence of an electric field.
(C) correct in presence of the electric field.
(D) correct in presence of the electromagnetic field.
Option b – correct in absence of an electric field.
Copper wire is not used preferably in potentiometer because i. resistivity of copper is small ii. temperature coefficient of resistance for copper wire is large iii. copper wire is highly sensitive iv. copper wire has a high potential gradient
(A) (i) and (iii)
(B) (i) and (iv)
(C) (ii) and (iv)
(D) (i) and (ii)
Option d – (i) and (ii)
A filament bulb (320 W, 60 V) is to be used in a 220 V main supply. When a resistance is connected in series, it works perfectly and the bulb consumes 320 W. The value of R is
(Α) 13 Ω
(Β) 30 Ω
(C) 46 Ω
(D) 26 Ω
Option b – 30 Ω
A sumo has a stereo system that draws a current of 500 mA when connected to a 12 V battery. The stereo is left playing from the battery for several hours while the engine is off. Finally, the battery voltage begins to drop. The radio can continue to operate until the current drops to 340 mA. At what battery voltage does the stereo stopped playing?
(A) 11.81 V
(B) 10.64 V
(C) 9.38 V
(D) 8.16 V
Option d – 8.16 V
A carbon resistor with color bands yellow, red, and orange and a tolerance strip is found to have a resistance of 39.9 k2, then the tolerance strip is likely to be of ……… color
(A) grey
(B) gold
(C) Silver
(D) no
Option b – gold
The current in a simple series circuit is 8 A. When an additional resistance of 2 is introduced, the current is reduced to 6 A, and the resistance of the original circuit is Assume that the applied potential difference is the same in both cases.
(A) 10 Ω
(Β) 8.6 Ω
(C) 6 Ω
(D) 3 Ω
Option c – 6 Ω
In how many more combinations of two identical and one different resistor can be connected than all three identical resistances?
(A) 1
(B) 2
(C) 3
(D) 4
Option b – 2
A wire of copper is taken and connected with a wire of iron of the same dimensions first in series and then in parallel, amongst two wires, the wire that will glow first is
(A) copper
(B) iron
(C) copper in series combination and iron in parallel combination
(D) iron in series combination and copper in parallel combination
Option d – iron in series combination and copper in parallel combination
Conceptually EMF of a cell is defined as the maximum potential difference between two electrodes of the cell
(A) when the cell is shorted.
(B) when the cell is open circuit.
(C) when unit current flows through it.
(D) when unit charge flows through it.
Option b – when the cell is open circuit.
Copper alloys are used in making standard resistances because
(A) copper has high conductivity.
(B) copper alloys have high conductivity.
(C) copper alloys have high resistivity.
(D) copper alloys are durable.
Option c – copper alloys have high resistivity.
Assertion: Silver and copper conductors of identical dimensions offer different resistances. Reason: The arrangement of atoms in silver and copper is different.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is False.
Option a – The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
The direction of drift velocity is the same as the direction of
(A) applied electric field.
(B) acceleration due to the applied electric field.
(C) electric lines of force due to the electric field.
(D) all of the above.
Option b – acceleration due to the applied electric field
Two resistors have resistances in the ratio of 1 : 20, the possible combination is
(A) Red, violet, black and Yellow, violet, brown
(B) Brown, black, black and Orange, black, black
(C) Red, red, black and yellow, yellow, brown
(D) Blue, blue, green and Green, black, brown
Option c – Red, red, black and yellow, yellow, brown
If two similar types of graphs are obtained when electrical resistivity is plotted against temperature. The graphs are likely to be of
(A) Manganin and carbon
(B) nickel and carbon
(C) Manganin and nickel
(D) none of the above
Option c – Manganin and nickel
In the meter bridge experiment, the balance point is observed at l. If two resistances were doubled and then interchanged then, the new balance point will be at
(A) l
(B) 27
(C) 100 – l
(D) 2 ( 100 – l )
Option c – 100 – l
Ohm’s law does not hold well for gallium arsenide material, because
(A) current remains constant for any value of voltage.
(B) resistance is infinite.
(C) negative resistance exists in the voltage-current variation.
(D) current goes to infinite at very low voltages.
Option c – negative resistance exists in the voltage-current variation.
A steady current is flowing through a conductor of the non-uniform cross-section. The charge passing through any cross-section of it per unit of time is
(A) directly proportional to the area of the cross-section.
(B) inversely proportional to the area of the cross-section.
(C) proportional to the square of the area of the cross-section.
(D) independent of the area of the cross-section.
Option d – independent of the area of the cross-section.
In a bungalow, there are 10 bulbs of 20 W, 5 bulbs of 100 W, 4 fans of 80 W, and 2 heaters of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of the main fuse of the bungalow will be
(A) 8 A
(B) 10 A
(C) 12 A
(D) 14 A
Option d – 14 A
Choose the correct statement ( Alternating Current Class 12 MCQ )
(A) Terminal potential difference of a battery is always equal to its emf.
(B) A terminal potential difference of a battery is always greater than its emf.
(C) A terminal potential difference of a battery is always smaller than its emf.
(D) none of the above
Option d – none of the above
When current is defined as the first derivative of charge with respect to time passing through a cross-section of the conductor in a definite direction, it means
(A) current is not unit current.
(B) current is a steady current.
(C) current is a variable current.
(D) current varies periodically.
Option c – current is a variable current.
Positively and negatively charged discs of dielectrics of the same radius are attached to two respective ends of a conductor then,
(A) no current will flow.
(B) current will flow for a brief time.
(C) AC current will flow.
(D) steady current will flow.
Option b – current will flow for a brief time.
The resistance of a conductor is 20 ohms at 50 °C and 24 ohms at 100 °C. Its resistance at 0 °C is
(A) 1 ohm
(B) 19 ohm
(C) 16 ohm
(D) 14 ohm
Option c – 16 ohm
In the case of a potentiometer, if zero deflection occurs at a longer length than before; it means
(A) the length of the wire is halved without changing the current.
(B) length of the wire is reduced by 20 cm without changing the current.
(C) length of the wire is increased by 20 cm without changing the current.
(D) current in the wire is decreased without changing the length of the wire.
Option c – length of the wire is increased by 20 cm without changing the current.
We covered all the alternating current class 12 MCQ above in this post for free so that you can practice well for the exam.
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