# 12th Class Physics MCQS Chapter 5

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Vrms =
0.7V?
0.007V?
0.07V?
0.75V?

The main reason for world wide use of A.C is because:
It is very high power
It can be transmitted over long distance
It is cheaper to use
ALl of above

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?
4 times
2 times
1/4 times
8 times

In purely resistive A.C circuit, instantaneous value of voltage and current:
Current lags behind voltage
Both are in Phase
Voltage leads current by Pase ?=?/2

Unit of impedance is:
Ohm-1
Ohm m-1
Ohm
no unit

The phase difference between the current and voltage at resonce is:
0
?/2
?
?/4

In case of capacitor, the unit of reactance is
Newton
Ohm
All of these

The electromagnetic spectrum contains
Microwaves
All of these
X-rays

The combined effect of resistance and reactance in circuit is called:
Capacitance
None of above
Impedance
Inductance

Impedance is denoted by:
Q
P
Z

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