Punjab 12th Class Physics Chapter 5 A.C. Circuit Mcqs Test Online

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Question 1 of 13

Physics

1. The circuit in which current and voltage are in phase, the power factor is:

1.-1

2.Zero

3.1

4.2

Question 1 of 13

Question 2 of 13

2. The peak value of alternating current is 5√2 A. the mean square value of current will be:

1.5A,

2.2.5A,

3.5√2A

4.5²A

Question 2 of 13

Question 3 of 13

3. In AC system we generate since wave form because:

1.It is nature standard

2.It can be easily draw

3.It produces least disturbance in electrical circuits

4.Other waves cannot be produced easily

Question 3 of 13

Question 4 of 13

4. An alternating voltage is given by 20 sin 157 t. the frequency of alternating voltage is:

1.100Hz

2.75Hz

3.50Hz

4.25Hz

Question 4 of 13

Question 5 of 13

5. In choke coil the reactance Xt and resistance R are:

1.Xt, = R

2.Xt, = <

3.Xt, = N

4.Xt,>>R

Question 5 of 13

Question 6 of 13

6. For electromagnetic waves, Maxwell generalized:

1.Amperes law

2.Gausses law for electricity

3.Faradays law

4.Gausses law for magnetism

Question 6 of 13

Question 7 of 13

7. An electromagnetic wave goes from air to glass which of the following does not change?

1.Ultra violet radiation

2.Radio waves

3.X-rays

4.Ultra sound waves

Question 7 of 13

Question 8 of 13

8. In an LRC circuit, the capacitance is made one-fourth, when in resonance. Then what should be change in inductance, so that the circuit remains in resonance?

1.4 times

2.2 times

3.¼ times

4.8 times

Question 8 of 13

Question 9 of 13

9. The phase difference between the current and voltage at resonance is:

1.π

2.π/2

3.- π

4.0

Question 9 of 13

Question 10 of 13

10. A capacitor is perfectly insulator for:

1.Alternating current

2.Direct current

3.None of these

4.Direct as well as alternating current

Question 10 of 13

Question 11 of 13

11. An alternating quantity (voltage or current) is completely known if we know it’s:

1.Both a and b

2.Frequency and phase

3.Effective value

4.Maximum value

Question 11 of 13

Question 12 of 13

12. The AC system is preferred to DC system because:

1.High voltage AC transmission is less efficient

2.AC voltage can be easily changed in magnitude

3.DC motor angular velocity is effected badly

4.Domestic appliances require AC voltage for their operation

Question 12 of 13

Question 13 of 13

13. In LR current which one of the following statement is correct?

1.The inductive reactance decreases with frequency

2.L and R oppose each other

3.R value increases with frequency

4.None of these

Question 13 of 13

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