set 1 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 9 EXERCISES

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The following question based on electric current and magnetism topic of general science mcq

Questions : In a three-pin electrical plug longest pin should be connected to

(a) Neutral terminal

(b) Ground terminal

(c) Live terminal

(d) Any terminal

The correct answers to the above question in:

Answer: (b)

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Question : 1

Whenever, current is changed in a coil, an induced e.m.f. is produced in the same coil. This property of the coil is due to

a) self induction

b) eddy currents

c) mutual induction

d) hysteresis

Answer: (a)

Question : 2

Potential at any point inside a charged hollow sphere

a) is a constant

b) decreases with distance from centre

c) increases with distance

d) is zero

Answer: (a)

As, E = $ -{dV}/{dr}$ or, O= $- {dV}/{dr}$

Because electric field inside a charged hollow sphere is zero. or, v = constant

Question : 3

Demagnetisation of magnets can be done by

a) magnetising in the opposite direction

b) rough handling

c) heating

d) All of the above

Answer: (d)

Question : 4

For electroplating a spoon, it is placed in the voltameter at

a) the position of cathode

b) exactly in the middle of anode and cathode

c) the position of anode

d) anywhere in the electrolyte

Answer: (a)

In electroplating, the metallic ions are positive, which are deposited on cathode.

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