## Class 12 Physics MCQs Magnetism And Matter for JEE/NEET

Here, you will get Class 12 Physics MCQ of Chapter 5 Magnetism And Matter for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 12 Physics Chapter 5 Magnetism And Matter, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 12 Physics with Answers on a daily basis and score well in exams.

## Magnetism And Matter Class 12 MCQs Questions with Answers

What is the angle of dip at a place where the horizontal component of earth’s magnetic field is equal to the vertical component?
(a) 0°
(b) 30°
(c) 45°
(d) 90°

Tangent law is applicable only when
(a) two uniform and mutually perpendicular magnetic fields exist
(b) two magnetic fields exist
(c) horizontal component of earth’s magnetic field is present
(d) uniform magnetic field are used

Answer: (a) two uniform and mutually perpendicular magnetic fields exist

A magnetic dipole moment is a vector quantity directed from:
(a) S to N
(b) N to S
(c) E to W
(d) W to E

The magnetic field strength due to a short bar magnet directed along its axial line at a distance r is B. What is its value at the same distance along the equatorial line?
(a) B
(b) 2B
(c) B/2
(d) B/4

The force between two parallel wire 2 × 10-7 Nm-1, placed 1 m apart to each other in vacuum. The electric current flowing through the wires is
(a) 1 A
(b) zero
(c) 5 × 106 A
(d) 2 × 10-7 A

The magnetic field of earth is due to
(a) induction effect of the sun
(b) the presence of a large magnet at the centre of the earth
(c) interaction of cosmic rays with the current of earth
(d) motion and distribution of some material in an outside the earth

Answer: (d) motion and distribution of some material in an outside the earth

Which of the following has a low value in ferrites?
(a) Conductivity
(b) Permeability
(c) Magnetic susceptibility
(d) All the above

The dimensional representation of magnetic flux density is
(a) [MLT-2]
(b) [MLT-2A-1]
(c) [MLT-2A-2]
(d) [MT-2A-1]

What is the magnetic field in the empty space enclosed by the toroidal solenoid of radius ‘R’?
(a) Infinity
(b) µ04π.2π𝑙𝑅
(c) µ04π.(π𝑙𝑅)
(d) zero

On quadrupling the moment of inertia of a magnet, its frequency of oscillation will become
(a) half
(b) double
(c) four times
(d) one-fourth

The neutral point in the magnetic field of a horizontally placed bar magnet is a point where the magnetic field due to that bar magnet is
(a) zero
(b) more than that of earth
(c) less than that of earth
(d) equal to that of earth

Answer: (d) equal to that of earth

Which of the following independent quantities is not used to specify the earth’s magnetic field?
(a) Magnetic declination (θ)
(b) Magnetic dip (δ)
(c) Horizontal component of earth’s field (BH)
(d) Vertical component of earth’s field (BV)

Answer: (d) Vertical component of earth’s field (BV)

Which of the following is responsible for the earth’s magnetic field?
(а) Convective currents in earth’s core
(б) Diversive current in earth’s core
(c) Rotational motion of earth
(d) Translational motion of earth

Answer: (а) Convective currents in earth’s core

The vertical component of earth’s magnetic field . at a place is √3 times the horizontal component. The value of angle of dip at this place is
(a) 30°
(b) 45°
(c) 60°
(d) 90°

The Mariner’s compass is provided with Gimbals arrangement so as to
(a) keep the needle always horizontal
(b) give a direct reading of declination
(c) give the direct value of dip
(d) all of the above

Answer: (c) give the direct value of dip

Which of the following has higher magnetic susceptibility?
(a) diamagnetic
(b) paramagnetic
(c) ferromagnetic
(d) None of these

The primary origin of magnetism lies in
(a) atomic current and intrinsic spin of electrons
(b) polar and non polar nature of molecules
(c) pauli exclusion principle
(d) electronegative nature of materials

Answer: (a) atomic current and intrinsic spin of electrons

The dimensional representation of √(l/MB) is similar to that of
(a) frequency
(b) time
(c) distance
(d) speed

The relation between geometric length (L) and magnetic length (Lm) is
(a) Lm = 56 Lg
(b) Lm = 65 Lg
(c)Lm = Lg
(d) Lm = 2RY;UL Lg

Answer: (a) Lm = 56 Lg

The radius of curvature of the path of charged particle in a uniform magnetic file is directly proportional to the
(a) charge on fie particle
(b) Momentum of particle
(c) energy of particle
(d) Strength of field

In a moving coil galvanometer, we use a radial magnetic field so that the galvanometer scale is
(a) exponential
(b) linear
(c) algebraic
(d) logarithmic

The magnetic lines of force inside a bar magnet:
(a) do not exist
(b) depends on area of cross-section of bar magnet
(c) are from N-pole to S-pole of the magnet
(d) are from S-pole to N-pole of the magnet

Answer: (d) are from S-pole to N-pole of the magnet

Ferrites may be
(a) ant. ferromagnetic
(b) ferromagnetic
(c) ferrimagnetic
(d) None of the above

Which of the following property shows the property of ferromagnetic substances?
(a) The ferromagnetic property depends on temperature
(b) The ferromagnetic property does not depend on temperature
(c) At high enough temperature ferromagnet becomes a diamagnet
(d) At low temperature ferromagnet becomes a paramagnet

Answer: (a) The ferromagnetic property depends on temperature

A wire of length I has a magnetic moment M. It is then bent into a semi-circular arc. The neyv magnetic moment is :
(a) M
(b) M.l.
(c) 2M/π
(d) M/π