Entry Test MCQ :: Alternating Current
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| 1. |
An alternating current or voltage |
| A. |
fluctuates off and on |
B. |
varies in magnitude alone |
| C. |
changes its direction again and again |
D. |
changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals. |
Answer: Option C
Explanation:
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| 2. |
A changing magnetic flux produces around itself an induced |
| A. |
Magnetic field |
B. |
Electric field |
| C. |
Electromagnetic force |
D. |
Artificial gravitational field |
Answer: Option C
Explanation:
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| 3. |
Maxwell derived mathematically that the velocity of the electromagnetic waves is |
Answer: Option B
Explanation:
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| 4. |
Electromagnetic waves travel in free space with the speed of |
| A. |
?-rays |
B. |
Positive rays |
| C. |
Cathode rays |
D. |
More than sound waves |
Answer: Option A
Explanation:
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| 5. |
The direction of propagation of an electromagnetic waves is |
| A. |
Perpendicular to electric field |
B. |
Perpendicular to both electric and magnetic field |
| C. |
Perpendicular to magnetic field |
D. |
Parallel to electric and magnetic field |
Answer: Option B
Explanation:
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| 6. |
An electromagnetic wave consists of |
| A. |
Electric and magnetic fields moving parallel to each other |
B. |
Magnetic field moving with velocity of light in space |
| C. |
Electric field moving with velocity of light |
D. |
Electric and magnetic fields moving perpendicular to each other |
Answer: Option D
Explanation:
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| 7. |
Electromagnetic waves transport |
Answer: Option A
Explanation:
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| 8. |
Waves emitted from the antenna are |
| A. |
Sound waves |
B. |
Electromagnetic waves |
| C. |
Radio waves |
D. |
Modulated waves |
Answer: Option B
Explanation:
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| 9. |
Electromagnetic waves emitted from antenna are |
| A. |
Stationary |
B. |
Longitudinal |
| C. |
Transverse |
D. |
All the above |
Answer: Option C
Explanation:
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| 10. |
Natural or resonant frequency of an LC circuit is |
Answer: Option D
Explanation:
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