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NEET • PHYSICS • CURRENT ELECTRICITY
Current electricity practice · Easy
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Practice format and chapter quiz
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Understanding
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Statement-1: If the length of a conductor is doubled, the drift velocity will become half of the original value (keeping potential difference unchanged).
Statement-2: At constant potential difference drift velocity is inversely proportional to the length of the conductor.
Statement-2: At constant potential difference drift velocity is inversely proportional to the length of the conductor.
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Correct option: A
Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1
Option A (Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1) is correct because the drift velocity is inversely proportional to the length of the conductor when the potential difference is kept constant, and doubling the length halves the drift velocity.
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Application
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The heat Produced in a given resistor in a given time by the sinusoidal current will be the same as that by a steady current of magnitude
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Correct option: D
Option D () is correct because the RMS value of a sinusoidal current is , and the heat produced is proportional to the square of the RMS current.
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Easy
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Analyzing
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Statement-1: If a wire is stretched to increase its length times then its resistance also become time.
Statement-2: Resistance of the wire is directly proportional to its length.
Statement-2: Resistance of the wire is directly proportional to its length.
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Correct option: D
Statement-1 is false, Statement-2 is true
Statement-1 is false, and Statement-2 is true. When a wire is stretched, its volume remains constant, so increasing length affects the area, changing the resistance non-linearly. Resistance is directly proportional to length.
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Easy
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Analyzing
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Statement-1: When a wire is stretched so that its diameter is halved then its resistance become 16 times.
Statement-2: Resistance of wire decrease with increase in length.
Statement-2: Resistance of wire decrease with increase in length.
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Correct option: C
Statement-1 is true, Statement-2 is false
Statement-1 is true, and Statement-2 is false. When the diameter is halved, the area becomes one-fourth, and since the volume is constant, the length becomes 4 times its initial length. Therefore, the resistance becomes 16 times. Resistance increases with length.
Revision notes and key takeaways
Review CURRENT ELECTRICITY in your textbook or class notes, then use this set to check your understanding.
Showing 31-34 of 34 questions