# electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

#### electric current and magnetism PRACTICE TEST [9 - EXERCISES]

Question : 1

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

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

Question : 2 [UPPCS (Pre) 2007]

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

a) Neutral terminal

b) Ground terminal

c) Live terminal

d) Any terminal

Question : 3

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

Question : 4

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

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

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

Question : 5

Demagnetisation of magnets can be done by

a) magnetising in the opposite direction

b) rough handling

c) heating

d) All of the above

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