NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 5 Magnetism and Matter Sample Test,Sample questions

Question:
A current carrying power line carries current from west to east. What will be direction of magnetic field 1 meter above it?

1. N to S

2.S to N

3.E to W

4.W to E


Question:
A magnetic dipole moment is a vector quantity directed from:

1.S to N

2. N to S

3.E to W

4.W to E


Question:
A wire of length I has a magnetic moment M. It is then bent into a semi-circular arc. The neyv magnetic moment is :

1.M

2.M.l.

3.2M/π

4.M/π


Question:
Ferrites may be:

1. ant. ferromagnetic

2.ferromagnetic

3.ferrimagnetic

4.None of the above


Question:
In a bar magnet, magnetic lines of force z :

1.are produced only at north pole like rays of light from a bulb

2.starts from north pole and ends at the south pole

3.emerge in circular paths from the middle of the bar

4. run continuously through the bar and outside


Question:
In a moving coil galvanometer, we use a radial magnetic field so that the galvanometer scale is :

1.exponential

2.linear

3.algebraic

4.logarithmic


Question:
On quadrupling the moment of inertia of a magnet, its frequency of oscillation will become:

1.half

2.double

3.four times

4.one-fourth


Question:
S.I. unit of flux is :

1.Ohm

2.Weber

3.Tesla

4.None


Question:
Tangent law is applicable only when:

1.two uniform and mutually perpendicular magnetic fields exist

2.two magnetic fields exist

3.horizontal component of earth’s magnetic field is present

4.uniform magnetic field are used


Question:
The dimensional representation of l/MB−−−−−√ is similar to that of:

1.frequency

2.time

3.distance

4.speed


Question:
The dimensional representation of magnetic flux density is :

1.[MLT-2]

2.[MLT-2A-1]

3.[MLT-2A-2]

4.[MT-2A-1]


Question:
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:

1.1 A

2.zero

3.5 × 106 A

4. 2 × 10-7 A


Question:
The magnetic field at the centre of a current carrying circular loop is B. If the radius of the loop is doubled keeping the current unchanged, the magnetic field at the centre of loop will become:

1.B/2

2.B/4

3.2B

4.4B


Question:
The magnetic field of earth is due to:

1.induction effect of the sun

2.the presence of a large magnet at the centre of the earth

3.interaction of cosmic rays with the current of earth

4.motion and distribution of some material in an outside the earth


Question:
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?

1.B

2. 2B

3.B/2

4.B/4


Question:
The magnetic lines of force inside a bar magnet:

1.do not exist

2.depends on area of cross-section of bar magnet

3.are from N-pole to S-pole of the magnet

4. are from S-pole to N-pole of the magnet.


Question:
The Mariner’s compass is provided with Gimbals arrangement so as to :

1. keep the needle always horizontal

2.give a direct reading of declination

3.give the direct value of dip

4.All the above


Question:
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:

1.zero

2.more than that of earth

3.less than that of earth

4.equal to that of earth


Question:
The radius of curvature of the path of charged particle in a uniform magnetic file is directly proportional to the

1.charge on fie particle

2.Momentum of particle

3.energy of particle

4. Strength of field


Question:
What is the angle of dip at a place where the horizontal component of earth’s magnetic field is equal to the vertical component?

1.0°

2.30°

3.45°

4.90°


Question:
Which of the following has a low value in ferrites?

1.Conductivity

2.Permeability

3.Magnetic susceptibility

4.All the above


Question:
Which of the following has higher magnetic susceptibility?

1.diamagnetic

2.paramagnetic

3.ferromagnetic

4.None of the above


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