Physics MCQs for CSIR NET JRF Part 2
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Question:
In a step-down transformer, the number of turns in
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Primary are less
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Primary are more
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Primary and secondary equal
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Secondary are infinite
Question:
In AC circuits choke is preferred to resistors because.
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Choke coil is cheap
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Voltage increases
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Energy is not wasted
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Current increases
Question:
A choke is used as resistance in
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AC circuits.
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DC circuits.
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Half-wave rectifier circuits.
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Both AC and DC circuits.
Question:
The frequency of AC mains in India is
Question:
A transformer works on
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DC only.
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AC only.
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Both AC and DC.
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High voltage only.
Question:
Alternating voltage
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Is independent of time.
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Varies directly with time.
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Varies inversely with time.
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Varies sinusoidally with time.
Question:
The law of electromagnetic induction have been used in the construction of
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Electric operator.
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Electric motor.
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Galvanometer.
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None of the above.
Question:
Power consumed in an AC circuit become zero if
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Inductance and resistance are both high.
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Inductance and resistance are both low.
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Inductance very high and resistance negligible.
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Inductance low and resistance high.
Question:
The rms value of currentis