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The following question based on electric current and magnetism topic of general science mcq
(a) in AC circuits only
(b) in both DC and AC circuits
(c) in DC circuits only
(d) neither in DC nor in AC circuits
The correct answers to the above question in:
Answer: (a)
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Read more physics gk Based General Science Questions and Answers
Question : 1
To convert mechanical energy into electrical energy, one can use
a) AC dynamo
b) DC dynamo
c) motor
d) Both (a) & (b)
Answer »Answer: (d)
Question : 2
From a power station, the power is transmitted at a very high voltage because –
a) it is cheaper to produce electricity at high voltage
b) electricity at high voltage is less dangerous
c) it is generated only at high voltage
d) there is less loss of energy in transmission at high voltage
Answer »Answer: (a)
Question : 3
In an a.c. circuit, the r.m.s. value of current, Irms is related to the peak current, I0 by the relation
a) $I_{rms} = π I_O$
b) $I_{rms} = {1/π}I_O$
c) $I_{rms} = √{2} I_O$
d) $I_{rms} = 1/√{2} I_O$
Answer »Answer: (d)
Question : 4
At the time of short circuit, the current in the circuit
a) does not change
b) increases heavily
c) reduces substantially
d) vary continuously
Answer »Answer: (b)
Question : 5
Consider the following statements: An ordinary light bulb has a rather short life because the:
- filament wire is not uniform.
- bulb cannot be evacuated completely.
- wires supporting the filament melt at high temperatures.
a) 1 and 2
b) 1 and 3
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (d)
Question : 6
According to international convention of colour coding in a wire
a) live is red, neutral is green and earth is black
b) live is brown, neutral is blue and earth is black
c) live is red, neutral is black and earth is green
d) live is red, neutral is black and earth is green
Answer »Answer: (d)
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