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

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Question 1 of 13

Physics

1. 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

2.¼ times

3.8 times

4.2 times

Question 1 of 13

Question 2 of 13

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

1.Domestic appliances require AC voltage for their operation

2.High voltage AC transmission is less efficient

3.DC motor angular velocity is effected badly

4.AC voltage can be easily changed in magnitude

Question 2 of 13

Question 3 of 13

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

1.Xt, = <

2.Xt,>>R

3.Xt, = N

4.Xt, = R

Question 3 of 13

Question 4 of 13

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

1.5A,

2.5√2A

3.5²A

4.2.5A,

Question 4 of 13

Question 5 of 13

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

1.1

2.-1

3.Zero

4.2

Question 5 of 13

Question 6 of 13

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

1.None of these

2.L and R oppose each other

3.The inductive reactance decreases with frequency

4.R value increases with frequency

Question 6 of 13

Question 7 of 13

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

1.It produces least disturbance in electrical circuits

2.Other waves cannot be produced easily

3.It can be easily draw

4.It is nature standard

Question 7 of 13

Question 8 of 13

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

1.25Hz

2.75Hz

3.50Hz

4.100Hz

Question 8 of 13

Question 9 of 13

9. For electromagnetic waves, Maxwell generalized:

1.Gausses law for magnetism

2.Amperes law

3.Faradays law

4.Gausses law for electricity

Question 9 of 13

Question 10 of 13

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

1.Radio waves

2.Ultra sound waves

3.X-rays

4.Ultra violet radiation

Question 10 of 13

Question 11 of 13

11. A capacitor is perfectly insulator for:

1.Alternating current

2.None of these

3.Direct current

4.Direct as well as alternating current

Question 11 of 13

Question 12 of 13

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

1.Effective value

2.Both a and b

3.Maximum value

4.Frequency and phase

Question 12 of 13

Question 13 of 13

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

1.π

2.0

3.- π

4.π/2

Question 13 of 13

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