Electromagnetic Induction & Alternating Currents-Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 9
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Question number: 1
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Question
The instantaneous value of current in an A. C. circuit is . The current will be maximum for the first time at,
Choices
| Choice (4) | Response | |
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| b. |
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| c. |
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| d. |
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Question number: 2
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Question
The frequency of ac mains in India is
Choices
| Choice (4) | Response | |
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| a. | 50 c/s or Hz |
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| b. | 30 c/s or Hz |
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| c. | 120 c/s or Hz |
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| d. | 60 c/s or Hz |
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Question number: 3
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Question
The voltage across a pure inductor is represented by the following diagram. Which one of the following diagrams will represent the current?
Graph of v→T (As Cos Function)
Here in figure voltage across a pure inductor is represented.
Choices
| Choice (4) | Response | |
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| a. |  Diagram of Current vs Time (Choice A) In figure current i→t (time) graph is indicate. |
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| b. |  Diagram of Current vs Time (Choice B) In figure current i→t (time) graph is indicate. |
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| c. |  Diagram of Current vs Time (Choice C) In figure current i→t (time) graph is indicate. |
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| d. |  Diagram of Current vs Time (Choice D) In figure current i→t (time) graph is indicate. |
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Question number: 4
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Assertion (Ꭺ)
The alternating current lags behind the emf by a phase angle of , when ac flows through an inductor.
Reason (Ꭱ)
The inductive reactance increases as the frequency of ac source decreases.
Choices
| Choice (4) | Response | |
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| a. | Both Ꭺ and Ꭱ are false |
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| b. | Ꭺ is true but Ꭱ is false |
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| c. | Ꭺ is false but Ꭱ is true |
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| d. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
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