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The following question based on electric current and magnetism topic of general science mcq
(a) 12 cm
(b) 4 cm
(c) 8 cm
(d) 32 cm
The correct answers to the above question in:
Answer: (b)
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Read more physics gk Based General Science Questions and Answers
Question : 1
p-n junction is said to be forward biased, when
a) the positive pole of the battery is joined to the n-semiconductor and p-semiconductor
b) the positive pole of the battery is connected to n- semiconductor and p- semiconductor
c) the positive pole of the battery is joined to the p-semiconductor and negative pole to the n-semiconductor
d) a mechanical force is applied in the forward direction
Answer »Answer: (c)
For forward biasing of p-n junction, the positive terminal of external battery is to be connected to p-semiconductor and negative terminal of battery to the n-semiconductor.
Question : 2
Which is not a device based on the heating effect of electricity?
a) Toaster
b) Refrigerator
c) Heater
d) Press
Answer »Answer: (a)
Question : 3
Assertion (A):
Light Emitting Diode (LED) lamps offer longer service life as compared to Compact Fluorescent Lamps (CFL).
Reason (R):
Light Emitting Diodes (LED) lamps are more energy efficient as compared to the Compact Fluorescent Lamps (CFL).
Select the correct answer using the codes given below.
Code
a) (A) is true, but (R) is false
b) Both (A) and (R) are true and (R) is the correct explanation of (A)
c) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (b)
Question : 4
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 : 5
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 : 6
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)
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