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The following question based on electric current and magnetism topic of general science mcq
(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
The correct answers to the above question in:
Answer: (c)
AC → Rectifier → DC
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Read more physics gk Based General Science Questions and Answers
Question : 1
The permanent magnet is made from which one of the following substances?
a) Ferromagnetic
b) Diamagnetic
c) Paramagnetic
d) Electromagnetic
Answer »Answer: (a)
Question : 2
Which impurity is doped in Si to form n-type semiconductors?
a) B
b) As
c) Al
d) None of these
Answer »Answer: (b)
Because As is pentavalent impurity.
Question : 3
For dynamo which one of the following statements is correct?
a) It converts the kinetic energy into heat energy
b) It converts the mechanical energy into electrical energy
c) It converts the electrical energy into light energy
d) It converts the electrical energy into mechanical energy
Answer »Answer: (b)
Question : 4
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 : 5
Electroplating does not help in
a) shining appearance
b) metals to become hard
c) fine finish to the surface
d) protect metals against corrosion
Answer »Answer: (b)
Electroplating does not help in making the metals become hard.
Question : 6
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)
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