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The following question based on electric current and magnetism topic of general science mcq
(a) Junction diode
(b) Wire bound resistor
(c) Potentiometer
(d) Electric bulb
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
Graphene is frequently in news recently. What is its importance?
- It is a two-dimensional material and has good electrical conductivity.
- It is one of the thinnest but strongest materials tested so far.
- It is entirely made of silicon and has high optical transparency.
- It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.
a) 1, 2 and 4 only
b) 1 and 2 only
c) 3 and 4 only
d) 1, 2, 3 and 4
Answer »Answer: (a)
Graphene is a two-dimensional material and has good electrical conduction. It is one of the thinnest but strongest materials tested so far.
It can be used for conducting electrodes required for touch screens, LCDs and organic LEDs.
Question : 2
Coulomb’s law is true for
a) nuclear distances (= 10–15 m)
b) charged as well as uncharged particles
c) atomic distances (= 10–11 m)
d) all the distances
Answer »Answer: (d)
Coulomb’s law is true for all distances small and large.
Hence it is called a long range force.
Question : 3
Which of the following is most suitable for the core of electromagnets?
a) Copper-nickel alloy
b) Soft iron
c) Steel
d) Air
Answer »Answer: (b)
Soft iron is highly ferromagnetic.
Question : 4
Alternating current is converted to direct current
a) By Transformer
b) By Dynamo
c) By Motor
d) By Rectifier
Answer »Answer: (d)
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