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?

1.2 times

2.¼ times

3.4 times

4.8 times

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.Ultra sound waves

2.X-rays

3.Ultra violet radiation

4.Radio waves

Question 2 of 13

Question 3 of 13

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

1.π/2

2.0

3.- π

4.π

Question 3 of 13

Question 4 of 13

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

1.L and R oppose each other

2.The inductive reactance decreases with frequency

3.R value increases with frequency

4.None of these

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, = R

4.Xt, = N

Question 5 of 13

Question 6 of 13

6. A capacitor is perfectly insulator for:

1.Direct current

2.Direct as well as alternating current

3.Alternating current

4.None of these

Question 6 of 13

Question 7 of 13

7. 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 7 of 13

Question 8 of 13

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

1.Other waves cannot be produced easily

2.It is nature standard

3.It can be easily draw

4.It produces least disturbance in electrical circuits

Question 8 of 13

Question 9 of 13

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

1.Frequency and phase

2.Maximum value

3.Both a and b

4.Effective value

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:

1.5²A

2.2.5A,

3.5√2A

4.5A,

Question 10 of 13

Question 11 of 13

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

1.1

2.-1

3.2

4.Zero

Question 11 of 13

Question 12 of 13

12. 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 12 of 13

Question 13 of 13

13. For electromagnetic waves, Maxwell generalized:

1.Faradays law

2.Gausses law for magnetism

3.Amperes law

4.Gausses law for electricity

Question 13 of 13

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