set 1 MCQ Questions & Answers Detailed Explanation

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

Questions : Demagnetisation of magnets can be done by

(a) magnetising in the opposite direction

(b) rough handling

(c) heating

(d) All of the above

The correct answers to the above question in:

Answer: (d)

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Question : 1

Fuse wire is made of

a) copper

b) aluminium

c) platinum

d) alloy of tin and lead

Answer: (b)

Question : 2

A fuse wire is characterized by

a) High resistance and low melting point

b) Low resistance and high melting point

c) Low resistance and low melting point

d) High resistance and high melting point

Answer: (a)

Question : 3

Match list I with list II and select the correct answer using the codes given below the lists

List I List II
A. Magnet with single pole 1. Resultant field is zero
B. Null points 2. Earth’s magnetic fields
C. Terrestrial magnetism 3. Does not exist
D. Artificial magnet 4. Horseshoe magnet
Select the correct answer using the codes given below the lists:

a) A – 3 ; B – 1 ; C – 2 ; D – 4

b) A – 3 ; B – 1 ; C – 2 ; D – 4

c) A – 4 ; B – 2 ; C – 3 ; D – 1

d) A – 2 ; B – 4 ; C – 1 ; D – 3

Answer: (b)

A → 3; B → 1; C → 2; D → 4

  1. Each magnet has N - S poles. Magnetic poles cannot be isolated.
  2. Null points are the points at which the field due to the magnet is completely neutralized by the horizontal component of the earth’s magnetic field.
  3. The branch of physics that deals with the study of the earth’s magnetic field are called terrestrial magnetism.
  4. Horseshoe magnet in an artificial magnet.

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

Answer: (a)

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

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

Question : 5

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 : 6

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

a) Neutral terminal

b) Ground terminal

c) Live terminal

d) Any terminal

Answer: (b)

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