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CBSE

Subject

Physics

NEET Physics : Magnetism and Matter

Multiple Choice Questions

21.

The ratio of magnetic moments of two short magnets which give null deflection in tan B position at 12 cm and 18 cm from the centre of a deflection magnetometer is

4:9
27:8
2:3
8:27

22.

The temperature of transition from ferromagnetic property to paramagnetic property is called

Transition temperature
Critical temperature
Curie temperature
Triplet temperature

23.

A frog can be levitated in magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as

paramagnetic
diamagnetic
ferromagnetic
anti-ferromagnetic

24.

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by $μ_{d}, μ_{p} and μ_{f}$ respectively, then

$μ_{d} \neq 0 and μ_{f} \neq 0$
$μ_{p} = 0 and μ_{f} \neq 0$
$μ_{d} = 0 and μ_{p} \neq 0$
$μ_{d} \neq 0, μ_{p} = 0$

25.

An ideal solenoid having 5000 turns/m has an aluminium core and carries a current of 5A. If χ_Al = 2.3 × 10^-5, then the magnetic field developed at centre will be

0.031 T
0.048 T
0.027 T
0.050 T

26.

A magnetic field exerts no force on

a magnet
an unmagnetised iron bar
a moving charge
stationary charge

27.

Magnetic field of a short magnet at a distance lm on axial line is 1 oersted at a distance 2 m on the same line the intensity in oersted is

0.75
0.125
0.25
0.5

28.

Assertion: In water, value of magnetic field decreases.

Reason: Water is a diamagnetic substance

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

29.

The distance between the poles of horse shoe magnet is 10 cm and its pole strength is 10⁴ A. The magnetic field induction at point P mid-way between the poles is

$8 \times 10^{- 9} tesla$
4×10^-19tesla
2×10^-9 tesla
zero

30.

Assertion: Magnetic field lines are continuous and closed.

Reason: Magnetic monopole does not exist

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false

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