bidezones.com /NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 7 Alternating Current Sample Test,Sample questions

Question:
A broadcast circute broadcasts at 300 m band. A condenser of capacitance 2.4 lµF is available. The value of the inductance required for resonant circuit is:

1.10-4 H

2.10-8 H

3.10-6 H

4.10-2 H

Posted Date:-2021-12-16 17:51:42


Question:
A rejector circuit is:

1.series resonant circuit

2.parallel resonant circuit

3.LCR circuit

4.None of the above

Posted Date:-2021-12-16 18:03:58


Question:
An ac ammeter connected in series in an ac circuit reads 5A. The peak value of current:

1. 5 A (b) (c)

2.5√2A

3.5√5 A

4.Zero

Posted Date:-2021-12-16 18:00:33


Question:
An acceptor circuit is :

1. series resonant circuit

2.parallel resonant circuit

3.LCR circuit

4.None of these

Posted Date:-2021-12-16 17:49:32


Question:
An electric circuit containing capacitor only suffers:

1.equal resistance for A.C. and D.C. (b)

2. Resistance of A.C. > Resistance of D.C.

3.Resistance for A.C. < Resistance of D.C.

4.offers infinite resistance for D.C.

Posted Date:-2021-12-16 18:09:08


Question:
An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the

1.15 V

2.120 V

3.180

4.960 V

Posted Date:-2021-12-16 17:44:39


Question:
Energy dissipates in LCR circuit in :

1.L only

2.C only

3.R only

4.All the above

Posted Date:-2021-12-16 17:41:44


Question:
Faraday constant:

1.depends on the amount of the electrolyte

2.depends on the current in the electrolyte

3.is a universal constant

4. depends on the amount of charge passed through the electrolyte

Posted Date:-2021-12-16 18:02:35


Question:
In pure inductive circuit current

1.lags behind emf by π/2

2. leads the emf by π/2

3.lags behind emf by π

4. leads the emf by π

Posted Date:-2021-12-16 18:04:57


Question:
In series resonant circuit:

1.reactance is zero

2.current is zero

3.voltage is zero

4.None of the above

Posted Date:-2021-12-16 17:53:47


Question:
In series resonant circuit:

1.reactance is zero

2.current is zero

3.voltage is zero

4.None of the above

Posted Date:-2021-12-16 17:53:49


Question:
In series resonant circuit:

1.reactance is zero

2.current is zero

3.voltage is zero

4.None of the above

Posted Date:-2021-12-16 17:53:53


Question:
In the above problem, the value of the resistance of the coil Y is:

1.0.58 Ω

2. 5.8 Ω

3.1.16

4. 11.6 Ω

Posted Date:-2021-12-16 18:07:56


Question:
Power factor of an ac circuit is a measure of:

1.virtual power

2.power lost in the circuit

3.mean power

4.All the above

Posted Date:-2021-12-16 14:46:36


Question:
The average power dissipation in pure inductance or capacitance is:
(a) 12 LI²

1.12 LI²

2.3/2 CV²

3.either (a) or (b)

4.zero

Posted Date:-2021-12-16 18:13:37


Question:
The current through an inductor of 1H is given by I = 3t sin t. The voltage across the inductor of 1 H is:

1.3 sin t + 3 cos t

2.3 sin t + 3t cos t

3.3 cos t + t sin t

4.3t cos t + sin t

Posted Date:-2021-12-16 18:06:04


Question:
The dimensional formula of impedance is;

1.[ML2T-2A-2]

2.ML2T-3A-2]

3.[ML2T-2A-1]

4. [ML2T-2A-3]

Posted Date:-2021-12-16 14:49:38


Question:
The dimensional formula of L/R is similar to that of:

1.requency

2.time

3.length

4.None of the above

Posted Date:-2021-12-16 14:47:14


Question:
The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

1.6 V

2.12 V

3.24 V

4.48 V

Posted Date:-2021-12-16 17:54:53


Question:
The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

1.6 V

2.12 V

3.24 V

4.48 V

Posted Date:-2021-12-16 17:54:55


Question:
The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

1.6 V

2.12 V

3.24 V

4.48 V

Posted Date:-2021-12-16 17:54:58


Question:
The phase difference b/w the A.C. and e.m.f. π2 Which of the following can not be the instituent of the circuit?

1.LC

2.L alone

3.C alone

4.RL

Posted Date:-2021-12-16 18:01:36


Question:
Transformer works on the principle of:

1.convertor

2.invertor

3.mutual induction

4.self-induction

Posted Date:-2021-12-16 17:56:03


Question:
Two coils X and Y are connected in series across a 240 V, 50 Hz supply. The resistance of X is 5Ω and inductance of Y is 0.02 H. The power consumed is 3 kW and the power factor is 0.75. The impedance of the circuit is:

1.0.144 Ω

2.1.44

3.14.4 Ω

4.144 Ω

Posted Date:-2021-12-16 18:07:09


Question:
What is the ratio of inductive and capacitance reactances in an ac circuit?

1. 1

2.ω²L

3.ω²LC

4.l

Posted Date:-2021-12-16 17:48:23


Question:
Which of the following effects is not shown in alternating current ?

1.Chemical effect

2.Magnetic effect

3.Heating current

4.All the above

Posted Date:-2021-12-16 17:58:28


Question:
Which of the following has dimensions different from the rest?

1. L/R

2.1RC

3.LC−−−√

4.RC

Posted Date:-2021-12-16 14:48:08


More MCQS[bidezones.com ]

  1. NCERT Societal Impact MCQ
  2. MCQ Questions for Class 12 Maths Chapter 1 Relations and Functions
  3. MCQ Questions for Class 12 Physics Chapter 1 Electric Charges and Field
  4. MCQ Questions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance
  5. Current Electricity Class 12 MCQs Questions
  6. MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism
  7. MCQ Questions for Class 12 Physics Chapter 5 Magnetism and Matter
  8. MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction
  9. MCQ Questions for Class 12 Physics Chapter 7 Alternating Current
  10. MCQ Questions for Class 12 Physics Chapter 8 Electromagnetic Waves
  11. MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments
  12. MCQ Questions for Class 12 Physics Chapter 10 Wave Optics
  13. MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter
  14. MCQ Questions for Class 12 Physics Chapter 12 Atoms
  15. MCQ Questions for Class 12 Physics Chapter 13 Nuclei
  16. MCQ Questions for Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits
  17. MCQ Questions for Class 12 Physics Chapter 15 Communication Systems
  18. MCQ Questions for Class 12 English
  19. MCQ Questions for Class 12 English Flamingo Chapter 3 Deep Water
  20. MCQ Questions for Class 12 English Flamingo Chapter 4 The Rattrap
  21. Human Geography: Nature and Scope Class 12 MCQs Questions
  22. MCQ Questions for Class 12 Geography Chapter 2 The World Population: Distribution, Density and Growth