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The following question based on electric current and magnetism topic of general science mcq
(a) direct current into alternating current
(b) current at low voltage to current at high voltage
(c) alternating current into direct current
(d) None of these
The correct answers to the above question in:
Answer: (a)
Inverter converts a.c. into d.c.
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Read more physics gk Based General Science Questions and Answers
Question : 1
Turbines and Dyanamos are used to convert which energy to electrical energy?
a) Mechanical energy
b) Chemical energy
c) Solar energy
d) Magnetic energy
Answer »Answer: (a)
Question : 2
The resistance of a thin wire in comparison of a thick wire of the same material
a) is equal
b) depends upon the metal of the wire
c) is low
d) is high
Answer »Answer: (d)
Question : 3
Which of the following metals is used as filament in lighting bulbs?
a) Silver
b) Iron
c) Molybdenum
d) Tungsten
Answer »Answer: (d)
Question : 4
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 : 5
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 : 6
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.
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