Entry Test MCQ :: Current Electricity
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31. |
SI unit of resistivity is |
Answer: Option C
Explanation:
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32. |
Which one of the following materials is useful for making bulb filaments? |
A. |
constantan |
B. |
nichrome |
C. |
copper |
D. |
tungsten |
Answer: Option A
Explanation:
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33. |
The resistance of a conductor at absolute zero (OK) is |
A. |
zero almost |
B. |
infinite almost |
C. |
no prediction at all |
D. |
may increase or decrease |
Answer: Option A
Explanation:
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34. |
Why should a resistance be introduced in a circuit in series deliberately? |
A. |
to increase current |
B. |
to decrease current |
C. |
to control current |
D. |
just to give a good look to circuit |
Answer: Option B
Explanation:
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35. |
Electrical energy is measured in |
A. |
watt |
B. |
horse power |
C. |
kilo watt |
D. |
kilowatt hour |
Answer: Option D
Explanation:
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36. |
All electrical appliances are connected in parallel to each other between the main line and neutral wire to get |
A. |
same current |
B. |
same current and potential difference |
C. |
different current but same potential difference |
D. |
different current and potential differences |
Answer: Option C
Explanation:
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37. |
Electrical energy is converted to heat at the rate of |
Answer: Option B
Explanation:
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38. |
Which one of the following bulbs has the least resistance? |
A. |
100 watt |
B. |
200 watt |
C. |
300 watt |
D. |
60 watt |
Answer: Option C
Explanation:
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39. |
A fuse is placed in series with the cireuit to protect against |
A. |
high power |
B. |
high voltage |
C. |
high current |
D. |
over heating |
Answer: Option D
Explanation:
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40. |
Terminal potential difference of a battery is greater than its emf when |
A. |
the internal resistance of battery is infinite |
B. |
the internal resistance of battery is zero |
C. |
the battery is charged |
D. |
the battery is discharged |
Answer: Option C
Explanation:
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