# Alternating Current CBSE Class 12 Physics MCQ Question with Answer Keys Solutions

If you are preparing for CBSE Class 12 Board Exam Term 1 which will be an objective type questions paper, then you need to practice multiple choice questions of Class 12 Physics Chapterwise. In this article of AKVTutorials, you will get Alternating Current CBSE Class 12 Physics MCQ Question with Answer Keys Solutions

Alternating Current MCQ Questions for Class 12 Question No 11:

Consider the following two statement A and B and identify the correct answer

A) At resonance of L-C-R series circuit, the reactance of circuit is minimum

B) The reactance of a capacitor in an AC circuit is similar to the resistance of a capacitor in a DC circuit

Option A : A is true but B is false

Option B : Both A and B are false

Option C : A is false but B is true

Option D : Both A and B are false

Option A : A is true but B is false

Alternating Current MCQ Questions for Class 12 Question No 12:

The instantaneous value of emf and current in an A.C. circuit are: E= 1.414sin (100πt – π/4), I = 0.707sin (100πt). The admittance of the circuit will be________   mho

Option A : 1 /√2

Option B : √2

Option C : 1/2

Option D : 2

Option C : 1/2

Alternating Current MCQ Questions for Class 12 Question No 13:

A resistance of 20Ω is connected to a source of alternating current rated 110 V, 50 Hz. Then the time taken by the current to change from its maximum value to the r.m.s value is

Option A : 2.5 × 10-3 sec

Option B : 2.5 × 10-2 sec

Option C : 5 × 10-3 sec

Option D : 25 × 10-3 sec

Option A : 2.5 × 10-3 sec

Alternating Current MCQ Questions for Class 12 Question No 14:

Statement (A) : The reactance offered by an inductance in A.C circuit decreases with increases of AC frequency.

Statement (B) : The reactance offered by a capacitor in AC circuit increases with increases of AC frequency

Option A : A is true B is false

Option B : Both A and B are true

Option C : A is false but B is true

Option D : Both A and B are false

Option D : Both A and B are false

Alternating Current MCQ Questions for Class 12 Question No 15:

Choose the wrong statement of the following

Option A : The peak voltage across the inductor can be less than the peak voltage of the source in a LCR circuit

Option B : In a circuit containing a capacitor and an ac source the current is zero at the instant source voltage is maximum

Option C : When an AC source is connected to a capacitor, then the rms current in the circuit gets increased if a dielectric slab is inserted into the capacitor

Option D : In a pure inductive circuit emf will be in phase with the current

Option D : In a pure inductive circuit emf will be in phase with the current

Alternating Current MCQ Questions for Class 12 Question No 16:

An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is applied to the coil the voltage leads the current by 45. The inductance of the coil is

Option A : 1 / 1000 π H

Option B : 1 / 20 π ×H

Option C : 1 / 40 π × H

Option D : 1 / 60  π × H

Option B : 1 / 20 π ×H

Alternating Current MCQ Questions for Class 12 Question No 17:

In an AC circuit containing an inductance and a capacitor in series, the current is found to be maximum when the value of the inductance is 0.5 Henry and capacitance is 8μF. The angular frequency of the input AC voltage must be equal to

Option A : 500 rad / sec

Option B : 4000 rad / sec

Option C : 5 × 10rad / sec

Option D : 5000 rad / sec

Option A : 500 rad / sec

Alternating Current MCQ Questions for Class 12 Question No 18:

Assertion (A) : A transformer can’t work on DC

Reason ( R) :  DC changes neither in magnetic nor in direction

Option A : A, R are true & R is the correct reason for A

Option B : A, R are true & R is not the correct reason for A

Option C : A is true, R is false

Option D : A is false, R is true

Option A : A, R are true & R is the correct reason for A

Alternating Current MCQ Questions for Class 12 Question No 19:

Assertion (A) : More the turns more is the resistance

Reason (R) : Impedance of primary and secondary in a transformer is directly proportional to number of turns in the coils

Option A : A, R are true & R is the correct reason for A

Option B : A, R are true & R is not the correct reason for A

Option C : A is true, R is false

Option D : A is false, R is true

Option A : A, R are true & R is the correct reason for A

Alternating Current MCQ Questions for Class 12 Question No 20:

Alternating current can not be measured by direct current meters, because

Option A : Alternating current can not pass through an ammeter

Option B : The average value of current for complete cycle is zero

Option C : Some amount of alternating current is destroyed in the ammeter

Option D : Peak value of current is Zero

Option B : The average value of current for complete cycle is zero

CBSE Class 12 Physics Chapterwise MCQ
1 : Electric Charge & Fields MCQs
| 1 to 10 | 11 to 20
2 : Electrostatics Potential and Capacitance MCQs
| 1 to 10 | 11 to 20
3 : Current Electricity MCQs
| 1 to 10 | 11 to 20
4 : Moving charges and Magnetism MCQs
| 1 to 10 | 11 to 20
5 : Magnetism and Matter MCQs
| 1 to 10 | 11 to 20
6 : Electromagnetic Induction MCQs
| 1 to 10 | 11 to 20
7 : Alternating Current MCQs
| 1 to 10 | 11 to 20
8 : Electromagnetic Waves MCQs
| 1 to 10 | 11 to 20
9 : Ray Optics and Optical Instruments MCQs
| 1 to 10 | 11 to 20
10 : Wave Optics MCQs
| 1 to 10 | 11 to 20
11 : Dual Nature of Radiation MCQs
| 1 to 10 | 11 to 20
12 : Atoms MCQs
| 1 to 10 | 11 to 20
13 : Nuclei MCQs
| 1 to 10 | 11 to 20
14 : Semi Conductor Electronics MCQs
| 1 to 10 | 11 to 20
15 : Communication Systems MCQs
| 1 to 10 | 11 to 20