Electromagnetic Induction & Alternating Currents-Alternating Currents [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 5 of 22
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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 | |
|---|---|---|
a. |
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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 | |
|---|---|---|
a. | 60 c/s or Hz | |
b. | 50 c/s or Hz | |
c. | 120 c/s or Hz | |
d. | 30 c/s or Hz | |
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)
Choices
| Choice (4) | Response | |
|---|---|---|
a. |  Diagram of Current vs Time (Choice A) | |
b. |  Diagram of Current vs Time (Choice B) | |
c. |  Diagram of Current vs Time (Choice C) | |
d. |  Diagram of Current vs Time (Choice D) | |
Question number: 4
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Question
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 | |
|---|---|---|
a. | Both Ꭺ and Ꭱ are false | |
b. | Ꭺ is true but Ꭱ is false | |
c. | Ꭺ is false but Ꭱ is true | |
d. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
Passage
Read the passage given below and answer the questions that follow:
If the voltage in an a c circuit is represented by the eq. , , then
Question number: 5 (1 of 1 Based on Passage) Show Passage
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Question
Frequency of ac is
Choices
| Choice (4) | Response | |
|---|---|---|
a. | 75 Hz | |
b. |
| |
c. |
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d. | 50 Hz | |