Physics/CBES Board(Class 12-Physics)MCQ Questions with Answers(Chapter 7 Alternating Current) Sample Test,Sample questions

Question:
A transformer works on the principle of

1.self induction

2.electrical inertia

3.mutual induction

4.magnetic effect of the electrical current


Question:
At resonance frequency the impedance in series LCR circuit is

1.maximum

2. minimum

3.zero

4. infinity


Question:
At resonant frequency the current amplitude in series LCR circuit is

1.maximum

2.minimum

3.zero

4.infinity


Question:
For an ideal-step-down transformer, the quantity which is constant for both the coils is

1.current in the coils

2.voltage across the coils

3.resistance of coils

4.power in the coils


Question:
In a pure capacitive circuit if the frequency of ac source is doubled, then its capacitive reactance will be

1.remains same

2.zero

3.doubled

4.halved


Question:
In a series LCR circuit the voltage across an inductor, capacitor and resistor are 20 V, 20 V and 40 V respectively. The phase difference between the applied voltage and the current in the circuit is

1.30°

2.45°

3.60°

4.0°


Question:
In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?

1.Only resistor

2.Resistor and inductor

3.Resistor and capacitor

4.Only inductor


Question:
In which of the following circuits the maximum power dissipation is observed?

1.Pure capacitive circuit

2.Pure inductive circuit

3.Pure resistive circuit

4.None of these


Question:
Quality factor and power factor both have the dimensions of

1.time

2.frequency

3.work

4.angle


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