Magnetism and Matter  MCQs

MCQs of Magnetism and Matter

Showing 121 to 130 out of 145 Questions
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121.
The relative permeability of iron is of the order of _____ .
(a) 1
(b) 104
(c) 0
(d) -4
Answer:

Option (b)

122.
The hysteresis cycle for the material of permanent magnet is _____ .
(a) short and wide
(b) tall and narow
(c) tall and wide
(d) short and narrow
Answer:

Option (c)

123.
Retentivity of soft ferromagnetic substance is _____ .
(a) high
(b) zero
(c) very low
(d) more
Answer:

Option (c)

124.
For a short bar magnet, B(axial) / B(equatorial) is _____
(a) 1:2
(b) 1:1
(c) 3:2
(d) 2:1
Answer:

Option (d)

125.
When a diamagnetic material is placed in non-uniform magnetic field, it experiences _____ .
(a) a resultant force towards the region of high magnetic field
(b) a resultant force towards the region of weak magnetic field
(c) a resultant force is zero
(d) None of the above
Answer:

Option (b)

126.
A magnetic has higher retentivity and high high coercivity. The magnet is _____ .
(a) electromagnetic
(b) soft magnet
(c) permanent magnet
(d) diamagnet
Answer:

Option (c)

127.
Electromagnet is used in _____ .
(a) electric bells
(b) coil
(c) galvanometer
(d) ammeter
Answer:

Option (a)

128.
Which of the following equation is true ?
(a) B2 = Bh2Bv2
(b) B2=Bv2 + Bh2
(c) B2 = Bv2Bh2
(d) B2=Bh2 Bv2
Answer:

Option (b)

129.
Two magnetic poles of pole strength 20 A m and 15 A m are kept at a distance of 10 cm. The force acting on one of the poles is _____ .
(a) 3 × 102 N
(b) 3 × 10-3 N
(c) 2 × 10-3 N
(d) 3 × 10-5 N
Answer:

Option (b)

130.
Two bar magnets of same size and same mass having magnetic dipole moments m1 and m2 vibrates at a place with periodic time T1 and T2, then _____ .
(a) m2m1=T1T2
(b) m1m2=T12T22
(c) m2m1=T12T22
(d) m2m1=T1T2
Answer:

Option (c)

Showing 121 to 130 out of 145 Questions
10 11 12 13 14 15