alternating current

alternating current

12th Grade

10 Qs

quiz-placeholder

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alternating current

alternating current

Assessment

Quiz

Physics

12th Grade

Medium

Created by

Sahana R

Used 1+ times

FREE Resource

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A resistor is connected to an AC power supply. On this circuit, the current

leads the voltage by 90°.

lags the voltage by 90°.

is in phase with the voltage.

none of the given answers

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

The electricity in our house is

AC

DC

BC

AD

3.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

If an electric bulb is connected to an AC source, which of the following statement is true about the phase difference between the voltage across the bulb and current flowing in it?

In phase.

Not in phase.

The voltage is leading the current.

The current is leading the voltage.

4.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which of the following general equations represent AC current

I=Iosin(2πft)I=I_o\sin\left(2\pi ft\right)

I=Iosin(2πft)I=I_o\sin\left(\frac{2\pi}{f}t\right)

I=Iocos(ωt)I=I_o\cos\left(\omega t\right)

I=Iocos(t)I=I_o\cos\left(t\right)

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which is the correct equation of 

 VrmsV_{rms} 

 Vrms=VoV_{rms}=V_o  

 Vrms=2VoV_{rms}=\frac{\sqrt{2}}{V_o}  

 Vrms=Vo2V_{rms}=\frac{V_o}{\sqrt{2}}  

 Vrms=Vo2sin 2tV_{rms}=\frac{V_o}{\sqrt{2}}\sin\ 2t  

6.

MULTIPLE CHOICE QUESTION

5 mins • 2 pts

A bulb is connected first with dc and then ac of same voltage then it will shine brightly with

a.c

d.c

Brightness will be in ratio 1/(1.4).

Equally with both.

7.

MULTIPLE CHOICE QUESTION

5 mins • 2 pts

Media Image

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

The voltage lags behind the current by π/2.

The voltage leads the current by π/2

The voltage and the current are in phase.

The voltage leads the current by π.

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