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

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Question 1 of 13

Physics

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

1.L and R oppose each other

2.None of these

3.The inductive reactance decreases with frequency

4.R value increases with frequency

Question 1 of 13

Question 2 of 13

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

1.Radio waves

2.X-rays

3.Ultra violet radiation

4.Ultra sound waves

Question 2 of 13

Question 3 of 13

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

1.25Hz

2.75Hz

3.100Hz

4.50Hz

Question 3 of 13

Question 4 of 13

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

1.DC motor angular velocity is effected badly

2.High voltage AC transmission is less efficient

3.Domestic appliances require AC voltage for their operation

4.AC voltage can be easily changed in magnitude

Question 4 of 13

Question 5 of 13

5. A capacitor is perfectly insulator for:

1.Direct as well as alternating current

2.Direct current

3.None of these

4.Alternating current

Question 5 of 13

Question 6 of 13

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

1.- π

2.0

3.π

4.π/2

Question 6 of 13

Question 7 of 13

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

1.Zero

2.-1

3.1

4.2

Question 7 of 13

Question 8 of 13

8. For electromagnetic waves, Maxwell generalized:

1.Gausses law for magnetism

2.Gausses law for electricity

3.Faradays law

4.Amperes law

Question 8 of 13

Question 9 of 13

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

1.It is nature standard

2.It produces least disturbance in electrical circuits

3.Other waves cannot be produced easily

4.It can be easily draw

Question 9 of 13

Question 10 of 13

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

1.2.5A,

2.5²A

3.5A,

4.5√2A

Question 10 of 13

Question 11 of 13

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

1.Effective value

2.Frequency and phase

3.Both a and b

4.Maximum value

Question 11 of 13

Question 12 of 13

12. 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?

1.2 times

2.8 times

3.¼ times

4.4 times

Question 12 of 13

Question 13 of 13

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

1.Xt, = R

2.Xt, = N

3.Xt,>>R

4.Xt, = <

Question 13 of 13

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