Chapter 16 Alternating Current Physics 12th Class Punjab MCQ Tests
12th Class Physics Chapter 16 MCQ Tests
Chapter 16 of 12th Class Physics has 45 questions. If you take an online MCQ test, the system will randomly choose the questions. If you want to take the quiz by chapter then click the start test button.
Total Questions: 45
Total Marks: 45
Time: 45 Mins
Total Questions: 45
Total Marks: 45
Time: 45 Mins
45Min : 00 Sec Remaining
Question # 1
Which of the following is the main characteristic of choke?
Question # 2
A student connects a long air core coil of manganin wire to 100 V DC source and records a current of 1.5A. When the same coil is connected across a 100 V, 50 Hz AC source, why the current reduces to 1A?
Question # 3
Which of the following statements is true about rms value of A.C circuit?
Question # 4
What type of core is used to make choke that is used to limit high frequency A.C?
Question # 5
Which of the following parts of e.m spectrum has the largest penetrating power?
Question # 6
Which of the following is not an electromagnetic wave?
Question # 7
Which of the following statements is true about current and voltage at resonance in RLC circuit?
Question # 8
What is the value of current at resonance frequency for L-C parallel circuit?
Question # 9
Why A.C continuously flows through the plates of a capacitor?
Question # 10
Which of the following quantities is measured by AC voltmeter?
Question # 11
The units of L/R are equivalent to which of the following units?
Question # 12
Which of the following conditions is satisfied at resonance in RLC series circuit?
Question # 13
When a choke coil is placed in series with an electric lamp in an A.C circuit, Why it causes the lamp to become dim?
Question # 14
Which of the following rays has smallest wavelength?
Question # 15
If an AC voltage source E = 150 √ 2 sin 100 t is connected across a circuit containing an AC ammeter and a capacitor of 1 μ F , what will be the ammeter reading?
Question # 16
Which of the following quantities is consumed by choke in extremely small amount?
Question # 17
Which of the following is not transported by electromagnetic waves?
Question # 18
The behavior of resistance is independent of which of the following quantities?
Question # 19
A capacitor of capacitance 79.5 μ F is connected in series with a resistance of 30 Ω across a 100 V, 50 Hz supply. What is the impedance and phase angle?
Question # 20
Which of the following statements is true in case of pure resistive A.C circuit?
Question # 21
Which of the following is the circuit energy in L.C circuit, when the capacitor is fully charged?
Question # 22
Which of the following radiations is a part of electromagnetic spectrum?
Question # 23
Which of the following electrical components allows only the continuous flow of A.C through a circuit?
Question # 24
Why is it not possible to generate the electromagnetic waves from a stationary charge?
Question # 25
Which of the following statements shows the concept behind the equations, I = I o sin ( ω t + 90 o ) and V = V o sin ( ω t ) ?
Question # 26
The expression P = VI holds for which of the following conditions?
Question # 27
Why is 240 V A.C more dangerous than 240 V D.C?
Question # 28
When a long air core coil of manganin is connected to a 120 V DC source, a current of 2A is recorded, and when same coil is connected across 120 V, 50 Hz AC supply, current is reduced to 1 A. What is the reactance of coil?
Question # 29
Where the energy resides in a current carrying inductor?
Question # 30
What is the phase angle between the voltage and current in A.C circuit through resistor?
Question # 31
A capacitor of 2000 μ F is connected across alternating source of 20 volts. If frequency of the source is 50 Hz, then what is the reactance of capacitor?
Question # 32
What will be the capacitance required to construct a resonance circuit of frequency 1000 kHz with an inductor of 5 mH?
Question # 33
What relation between the voltage through inductor V L and voltage through resistor V R is represented by the phasor diagram, as shown in image?
Question # 34
What will be measured by an ordinary D.C ammeter if it is used to measure alternating current?
Question # 35
What will be the impedance of RLC series circuit at resonance?
Question # 36
Which of the following is used to feed energy in LC oscillator for continuous production of electromagnetic waves?
Question # 37
If the peak value of A.C voltage is 28 √2 , then what is its effective value (rms value)?
Question # 38
An inductor of 0.8 H and a capacitor of 10 μ F are connected in series in an AC circuit. What will be the angular frequency of AC source when the current in circuit is maximum?
Question # 39
What type of combination of circuit is present in a metal detector?
Question # 40
An A.C supply is connected in series with a resistor R, as shown in image. Current I in resistor is I = 9.9 sin ( 380 t ) . What is the minimum resistance of R, if the mean power dissipated in resistor must not exceed 400 W?
Question # 41
What is the impedance of circuit at resonance frequency for L-C parallel circuit?
Question # 42
If an iron rod is introduced in inductor then what will happen to the bulb, as shown in image?
Question # 43
Choke is used to limit current in which type of circuits?
Question # 44
Why is there no loss of energy due to production of back emf in RL circuit?
Question # 45
Which of the following is true about an inductive A.C circuit?
Total Questions
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Question # 1
Which of the following is the main characteristic of choke?
Question # 2
A student connects a long air core coil of manganin wire to 100 V DC source and records a current of 1.5A. When the same coil is connected across a 100 V, 50 Hz AC source, why the current reduces to 1A?
Question # 3
Which of the following statements is true about rms value of A.C circuit?
Question # 4
What type of core is used to make choke that is used to limit high frequency A.C?
Question # 5
Which of the following parts of e.m spectrum has the largest penetrating power?
Question # 6
Which of the following is not an electromagnetic wave?
Question # 7
Which of the following statements is true about current and voltage at resonance in RLC circuit?
Question # 8
What is the value of current at resonance frequency for L-C parallel circuit?
Question # 9
Why A.C continuously flows through the plates of a capacitor?
Question # 10
Which of the following quantities is measured by AC voltmeter?
Question # 11
The units of L/R are equivalent to which of the following units?
Question # 12
Which of the following conditions is satisfied at resonance in RLC series circuit?
Question # 13
When a choke coil is placed in series with an electric lamp in an A.C circuit, Why it causes the lamp to become dim?
Question # 14
Which of the following rays has smallest wavelength?
Question # 15
If an AC voltage source E = 150 √ 2 sin 100 t is connected across a circuit containing an AC ammeter and a capacitor of 1 μ F , what will be the ammeter reading?
Question # 16
Which of the following quantities is consumed by choke in extremely small amount?
Question # 17
Which of the following is not transported by electromagnetic waves?
Question # 18
The behavior of resistance is independent of which of the following quantities?
Question # 19
A capacitor of capacitance 79.5 μ F is connected in series with a resistance of 30 Ω across a 100 V, 50 Hz supply. What is the impedance and phase angle?
Question # 20
Which of the following statements is true in case of pure resistive A.C circuit?
Question # 21
Which of the following is the circuit energy in L.C circuit, when the capacitor is fully charged?
Question # 22
Which of the following radiations is a part of electromagnetic spectrum?
Question # 23
Which of the following electrical components allows only the continuous flow of A.C through a circuit?
Question # 24
Why is it not possible to generate the electromagnetic waves from a stationary charge?
Question # 25
Which of the following statements shows the concept behind the equations, I = I o sin ( ω t + 90 o ) and V = V o sin ( ω t ) ?
Question # 26
The expression P = VI holds for which of the following conditions?
Question # 27
Why is 240 V A.C more dangerous than 240 V D.C?
Question # 28
When a long air core coil of manganin is connected to a 120 V DC source, a current of 2A is recorded, and when same coil is connected across 120 V, 50 Hz AC supply, current is reduced to 1 A. What is the reactance of coil?
Question # 29
Where the energy resides in a current carrying inductor?
Question # 30
What is the phase angle between the voltage and current in A.C circuit through resistor?
Question # 31
A capacitor of 2000 μ F is connected across alternating source of 20 volts. If frequency of the source is 50 Hz, then what is the reactance of capacitor?
Question # 32
What will be the capacitance required to construct a resonance circuit of frequency 1000 kHz with an inductor of 5 mH?
Question # 33
What relation between the voltage through inductor V L and voltage through resistor V R is represented by the phasor diagram, as shown in image?
Question # 34
What will be measured by an ordinary D.C ammeter if it is used to measure alternating current?
Question # 35
What will be the impedance of RLC series circuit at resonance?
Question # 36
Which of the following is used to feed energy in LC oscillator for continuous production of electromagnetic waves?
Question # 37
If the peak value of A.C voltage is 28 √2 , then what is its effective value (rms value)?
Question # 38
An inductor of 0.8 H and a capacitor of 10 μ F are connected in series in an AC circuit. What will be the angular frequency of AC source when the current in circuit is maximum?
Question # 39
What type of combination of circuit is present in a metal detector?
Question # 40
An A.C supply is connected in series with a resistor R, as shown in image. Current I in resistor is I = 9.9 sin ( 380 t ) . What is the minimum resistance of R, if the mean power dissipated in resistor must not exceed 400 W?
Question # 41
What is the impedance of circuit at resonance frequency for L-C parallel circuit?
Question # 42
If an iron rod is introduced in inductor then what will happen to the bulb, as shown in image?
Question # 43
Choke is used to limit current in which type of circuits?
Question # 44
Why is there no loss of energy due to production of back emf in RL circuit?
Question # 45
Which of the following is true about an inductive A.C circuit?
Total Questions
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Physics MCQ Test by Topics
- +16.1 Alternating Current
- +1 Instantaneous Value
- +2 Peak Value
- +3 Peak to peak Value
- +4 Root Mean Square (rms) value
- +4 Phase of A.C.
- +4 Phase Lag and Phase Lead
- +4 Vector Representation of an Alternating Quantity
- +16.2 A.C. Circuits
- +16.3 A.C. Through a Resistor
- +16.4 A.C. Through a Capacitor
- +16.5 A.C. Through an Inductor
- +16.6 Impedance
- +16.7 R-C and R-L Series Circuits
- +16.8 Power in A.C. Circuits
- +16.9 Series Resonance Circuit
- +16.10 Parallel Resonance Circuit
- +16.11 Three Phase A.C. Supply
- +16.12 Principle of Metal Detectors
- +16.13 Choke
- +16.14 Electromagnetic Waves
- +16.15 Principle of Generation, Transmission and Reception of Electromagnetic Waves
- +16.16 Modulation
- +16.16 Amplitude Modulation
- +16.16 Frequency Modulation
Physics
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Updated on: 17-10-2026
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