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The following question based on electric current and magnetism topic of general science mcq
(a) it has a resistance of 8 ohm
(b) it will work only if current is 8A
(c) it will not work if current is less than 8A
(d) it will burn if current exceeds 8A
The correct answers to the above question in:
Answer: (c)
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Read more physics gk Based General Science Questions and Answers
Question : 1
Which of the following sentences is/are correct about a conductor of electricity?
- Metals in general are good conductors of electricity.
- Distilled water conducts electricity.
- Top water conducts electricity.
- Rubber is a bad conductor of electricity
a) 1, 3 and 4
b) 1 and 2
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (a)
Distilled water is insulator of electricity.
Question : 2
Which one of the following is a non-magnetic substance?
a) Nickel
b) Iron
c) Cobalt
d) Brass
Answer »Answer: (d)
Question : 3
The magnetic compass is not useful for navigation near the magnetic poles. Since
a) H = 0
b) R = 0
c) V = 0
d) ϴ = 0°
Answer »Answer: (a)
Near the magnetic poles, H = 0, therefore, magnetic compass will not work.
Question : 4
The main power supply in India is at 220 V, whereas that in the US is at 110 V. Which one among the following statements in this regard is correct?
a) 110 V leads to lower power loss
b) 110 V is safer but more expensive to maintain
c) 110 V is safer and cheaper to maintain
d) 110 V works better at higher latitudes
Answer »Answer: (b)
Question : 5
Barrier potential of a p-n junction diode does not depend on
a) diode design
b) temperature
c) doping density
d) forward bias
Answer »Answer: (a)
[Hint : Barrier potential depends on, doping density, temperature, forward/reverse bias but does not depend on diode design.]
Question : 6
Which element is the best conductor of electricity?
a) Aluminium
b) Silver
c) Copper
d) Iron
Answer »Answer: (b)
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