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The following question based on electric current and magnetism topic of general science mcq
(a) shining appearance
(b) metals to become hard
(c) fine finish to the surface
(d) protect metals against corrosion
The correct answers to the above question in:
Answer: (b)
Electroplating does not help in making the metals become hard.
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Read more physics gk Based General Science Questions and Answers
Question : 1
If potential difference and current flowing through a wire is increased twice each, then electric power
a) Will increase two times
b) Will remain unaffected
c) Will increase four times
d) Will decrease half
Answer »Answer: (c)
Question : 2
Function of rectifier is
a) To convert D.C. into A.C.
b) To convert A.C. into D.C.
c) Both (a) and (b)
d) None of these
Answer »Answer: (c)
AC → Rectifier → DC
Question : 3
The permanent magnet is made from which one of the following substances?
a) Ferromagnetic
b) Diamagnetic
c) Paramagnetic
d) Electromagnetic
Answer »Answer: (a)
Question : 4
The distance between two magnetic poles is doubled and their pole-strength is also doubled. The force between them
a) remains unchanged
b) increases to four times
c) decreases by half
d) increases to two times
Answer »Answer: (c)
Question : 5
Alternating current cannot be measured by D.C. ammeter because
a) A.C. changes direction
b) A.C. cannot pass through D.C. ammeter
c) average value of current for complete cycle is zero
d) D.C. ammeter will get damaged
Answer »Answer: (c)
D.C. ammeter measures average current in AC current, average current is zero for a complete cycle.
Hence reading will be zero.
Question : 6
Metals getting magnetised by orientation of atomic magnetic moments in external magnetic field are called
a) ferromagnetics
b) diamagnetics
c) paramagnetics
d) antimagnetics
Answer »Answer: (c)
In paramagnetic metals, magnetism is acquired by orientation of atomic dipoles.
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