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

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Question 1 of 13

Physics

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

1.Xt, = N

2.Xt, = <

3.Xt,>>R

4.Xt, = R

Question 1 of 13

Question 2 of 13

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

1.25Hz

2.100Hz

3.75Hz

4.50Hz

Question 2 of 13

Question 3 of 13

3. For electromagnetic waves, Maxwell generalized:

1.Amperes law

2.Gausses law for electricity

3.Gausses law for magnetism

4.Faradays law

Question 3 of 13

Question 4 of 13

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

1.It can be easily draw

2.It is nature standard

3.Other waves cannot be produced easily

4.It produces least disturbance in electrical circuits

Question 4 of 13

Question 5 of 13

5. 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.None of these

4.R value increases with frequency

Question 5 of 13

Question 6 of 13

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

1.Maximum value

2.Both a and b

3.Effective value

4.Frequency and phase

Question 6 of 13

Question 7 of 13

7. A capacitor is perfectly insulator for:

1.None of these

2.Direct current

3.Alternating current

4.Direct as well as alternating current

Question 7 of 13

Question 8 of 13

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

1.- π

2.π/2

3.π

4.0

Question 8 of 13

Question 9 of 13

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

1.DC motor angular velocity is effected badly

2.AC voltage can be easily changed in magnitude

3.Domestic appliances require AC voltage for their operation

4.High voltage AC transmission is less efficient

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.X-rays

2.Radio waves

3.Ultra violet radiation

4.Ultra sound waves

Question 10 of 13

Question 11 of 13

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

1.Zero

2.2

3.-1

4.1

Question 11 of 13

Question 12 of 13

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

1.5√2A

2.5²A

3.5A,

4.2.5A,

Question 12 of 13

Question 13 of 13

13. 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?

1.¼ times

2.2 times

3.8 times

4.4 times

Question 13 of 13

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