Rajasthan Board RBSE Class 12 Physics Chapter 8 Magnetism and Properties of Magnetic Substances
RBSE Class 12 Physics Chapter 8 Text Book Exercise with Answers
RBSE Class 12 Physics Chapter 8 Multiple Choice Type Questions
Question 1.
Assuming the distance between two attractive posts of unit attractive strength is 1 m, then, at that point, force acting between them will be:
(a) 4π × 10-7 N
(b) 4π N
(c) 10-7 N
(d) 4π/10−7 N
Reply:
(c) 10-7 N
extremely less for :
(a) ferromagnetic substances
(b) paramagnetic substances
(c) diamagnetic substances
(d) all of the abovementioned
Reply:
(c) diamagnetic substances
For diamagnetic substances.
Question 2.
Attractive weakness for superconductors is :
(a) +1
(b) - 1
(c) zero
(d) boundlessness
Reply:
(b) - 1
For superconductors, worth of attractive weakness is - 1.
Question 3.
Attractive weakness of free space is :
(a) +1
(b) - 1
(c) zero
(d) boundlessness
Reply:
(c) zero
Attractive weakness of free space is zero.
Question 4.
Attractive weakness is negative and extremely less for :
(a) ferromagnetic substances
(b) paramagnetic substances
(c) diamagnetic substances
(d) all of the abovementioned
Reply:
(c) diamagnetic substances
For diamagnetic substances.
Question 5.
On the off chance that the general porousness of a substance is 1.00001, substance will be :
(a) ferromagnetic
(b) paramagnetic
(c) diamagnetic
(d) none of these
Reply:
(b) paramagnetic
As μr > 1, so substance ought to be paramagnetic.
Question 6.
Unit of attractive second is :
(a) Wb
(b) Wb/m2
(c) A/m
(d) Am2
Reply:
(d) Am2
Unit of attractive second is Am2
Question 7.
Wb × A/m is equivalents to :
(a) J
(b) N
(c) H
(d) W
Reply:
(b) N
Wb × A/m is equivalent to N.
Question 8.
In which of the accompanying, the attractive field doesn't transaction with :
(a) magnet
(b) sped up magnet
(c) static charge
(d) powerful charge
Reply:
(c) static charge
Attractive field doesn't connect with static charges.
Question 9.
The reason for dimegnetism is :
(a) orbital movement of electrons
(b) turn movement of electrons
(c) combined electrons
(d) nothing from what was just mentioned
Reply:
(a) orbital movement of electrons
Because of orbital movement of electrons.
Question 10.
Attractive snapshot of diamagnetic substances is :
(a) boundlessness
(b) zero
(c) 100 Am2
(d) none of these
Reply:
(b) zero
Attractive snapshot of diamagnetic substance is zero.
Question 11.
The overall penetrability of ferromagnetic substance is :
(a) μr > 1
(b) μr >> l
(c) μr = 1
(d) μr = 0
Reply:
(b) μr >> l
For ferromagnetic substance μr >> l .
Question 12.
Vertical part of earth's attractive field is zero at:
(a) attractive post
(b) geological shaft
(c) attractive meridian
(d) none of these
Reply:
(d) none of these
None of the choice is right.
Question 13.
Area of hysteresis circle of any substance address:
(a) energy misfortune in polarizing a substance in unit cycle
(b) energy misfortune in polarizing unit volume in unit cycle
(c) energy misfortune in polarizing a substance for unit volume
(d) energy misfortune in polarizing a substance
Reply:
(d) energy misfortune in polarizing a substance
Question 14.
Steel is utilized for making extremely durable magnet on the grounds that :
(a) energy misfortune is least
(b) thickness of steel is more
(c) lingering attraction of steel is more
(d) because of outer attractive field the attraction doesn't obliterate without any problem
Reply:
(d) because of outer attractive field the attraction doesn't annihilate without any problem
Its attraction doesn't obliterate effectively by outside attractive field.
Question 15.
At Curie temperature, ferromagnetic substance becomes: .
(a) paramagnetic
(b) diamagnetic
(c) ferromagnetic
(d) more ferromagnetic
Reply:
(c) ferromagnetic
Paramagnetic.
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