Physics Test 76

Result

Physics Test 76

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

An inductance of 4 H, a capacitance of 9 μF and a resistance at 500 Ω are connceted in series with an ac source of 200 V. The frequency of ac source is adjustable. The frequency chosen to maximise the current in the circuit is

A
50 Hz

B
42.8 Hz

C
26.5 Hz

D
17.6 Hz
Question 2
4 / -1

200 Ω resistance and 1H inductance are connected in series with an A.C. circuit. The frequency of the source is 200/2π Hz. Then phase difference in between V and I will be:

A
30°

B
60°

C
45°

D
90°
Question 3
4 / -1

In series LCR circuit voltage leads the current when (Given that ω₀ = resonant angular frequency):

A
ω < ω₀

B
ω = ω₀

C
ω > ω₀

D
None of these

Solution

Current lags voltage in inductive circuit

X_L > X_C

ωL > 1 / ωc

ω > 1 / √LC

ω > ω₀
Question 4
4 / -1

In an a.c. circuit V and I are given by

V = 100 sin (100 t) volts

I = 100 sin (100t + π/3) mA

The power dissipated in the circuit is:

A
10⁴ watt

B
10 watt

C
2.5 watt

D
5.0 watt