EASY
12th CBSE
IMPORTANT
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When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220V. This means
 

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Important Questions on Alternating Current

EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 7 - Alternating Current>MCQ>Q 7.4
To reduce the resonant frequency in an RLC series circuit of a generator,
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 7 - Alternating Current>MCQ>Q 7.5
 Which of the following combinations should be selected for better tuning of an LCR circuit used for communication?
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 7 - Alternating Current>MCQ>Q 7.6
An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (rms) a.c. source. The power dissipated in the circuit is
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 7 - Alternating Current>MCQ>Q 7.7
The output of a step-down transformer is measured to be 24 V when connected to a 12 W light bulb. The value of the peak current is
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 7 - Alternating Current>MCQ>Q 7.8
As the frequency of an ac circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit?
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 7 - Alternating Current>MCQ>Q 7.9
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 ?
EASY
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 7 - Alternating Current>MCQ>Q 7.1
Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct?
MEDIUM
12th CBSE
IMPORTANT
NCERT Exemplar Physics - Class 12>Chapter 7 - Alternating Current>MCQ>Q 7.11
For an LCR circuit, the power transferred from the driving source to the driven oscillator is P=I2Zcosϕ