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Alternating Current MCQ Level - 1


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10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Alternating Current MCQ Level - 1

Alternating Current MCQ Level - 1 for Physics 2022 is part of Topic wise Tests for IIT JAM Physics preparation. The Alternating Current MCQ Level - 1 questions and answers have been prepared according to the Physics exam syllabus.The Alternating Current MCQ Level - 1 MCQs are made for Physics 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Alternating Current MCQ Level - 1 below.
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Alternating Current MCQ Level - 1 - Question 1

Which of the following has different dimension from the other three,

Detailed Solution for Alternating Current MCQ Level - 1 - Question 1

The correct answer is: LR

Alternating Current MCQ Level - 1 - Question 2

An alternating emf is applied across a parallel combination of a resistance R, capacitance C and an induction L. If IRILIC are the currents through RL and C respectively, then the diagram which correctly represents the phase relationship among IRILIC and source emf ε is the given by

Detailed Solution for Alternating Current MCQ Level - 1 - Question 2

The correct answer is: 

IL lags behind IR by a phase of π/2
IC lags behind IR by a phase of π/2

Alternating Current MCQ Level - 1 - Question 3

The average power dissipated is pure inductance is

Alternating Current MCQ Level - 1 - Question 4

The value of current at half power points is

Detailed Solution for Alternating Current MCQ Level - 1 - Question 4

The correct answer is: 

Alternating Current MCQ Level - 1 - Question 5

A DC ammeter cannot measure alternating current value

Alternating Current MCQ Level - 1 - Question 6

The time required for a 50Hz alternating current to increase from zero to 70.7% of its peak value is

Detailed Solution for Alternating Current MCQ Level - 1 - Question 6

 Answer :- b

Solution :- 1/(50×8) 

= 1/400sec

= 2.5ms

Alternating Current MCQ Level - 1 - Question 7

The variation of the instantaneous current I and the instantaneous emf E in a circuit is as shown in figure. Which of the following statements is correct

Detailed Solution for Alternating Current MCQ Level - 1 - Question 7

The correct answer is: The voltage leads the current by π/2

Alternating Current MCQ Level - 1 - Question 8

The term cos φ in an AC circuit is called

Detailed Solution for Alternating Current MCQ Level - 1 - Question 8

The correct answer is: power factor

Alternating Current MCQ Level - 1 - Question 9

In a series LCR circuit containing an AC voltage source of frequency ω, current and voltage V. Then for the given resistance, the correct statement is:

Detailed Solution for Alternating Current MCQ Level - 1 - Question 9

The correct answer is: Current is maximum at ω2 = 1/LC 

Alternating Current MCQ Level - 1 - Question 10

In an electric circuit applied ac emf is ε = 20 sin 300t Volt and the current is i = 4 sin 300t Amp. The resistance of the circuit is.

Detailed Solution for Alternating Current MCQ Level - 1 - Question 10

 Answer :- d

Solution :- Emf, e = 20sin300t

Current, i = 4sin300t

Reactance, R = emf/I

 R = 20/4

​ =5ohm 

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