Alternating Current MCQ Level - 1
10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Alternating Current MCQ Level - 1
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Which of the following has different dimension from the other three,
The correct answer is: LR
An alternating emf is applied across a parallel combination of a resistance R, capacitance C and an induction L. If IR, IL, IC are the currents through R, L and C respectively, then the diagram which correctly represents the phase relationship among IR, IL, IC and source emf ε is the given by
The correct answer is:
IL lags behind IR by a phase of π/2
IC lags behind IR by a phase of π/2
The average power dissipated is pure inductance is
The correct answer is: 
A DC ammeter cannot measure alternating current value
The time required for a 50Hz alternating current to increase from zero to 70.7% of its peak value is
Answer :- b
Solution :- 1/(50×8)
= 1/400sec
= 2.5ms
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
The correct answer is: The voltage leads the current by π/2
The correct answer is: power factor
In a series LCR circuit containing an AC voltage source of frequency ω, current I and voltage V. Then for the given resistance, the correct statement is:
The correct answer is: Current is maximum at ω2 = 1/LC
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.
Answer :- d
Solution :- Emf, e = 20sin300t
Current, i = 4sin300t
Reactance, R = emf/I
R = 20/4
=5ohm
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