bidezones.com /NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism Sample Test,Sample questions

Question:
10 eV electron is circulating in a plane at right angle to a uniform field of magnetic induction 10-1 Wb/m² (1G). The orbital radius of electron is:

1.12 cm

2.16 cm

3.11 cm

4.18 cm

Posted Date:-2021-12-16 11:50:13


Question:
A charge + q is sent through a magnetic field. The force acting on it is maximum w hen the angle between the direction of motion of the charged particle and the magnetic field :

1.0°

2.45°

3.90°

4.180°

Posted Date:-2021-12-16 11:40:58


Question:
A current carring coil is placed in a uniform magnetic field. If the coil turns through an angle θ, then the torque is directly proportional to:

1. sin θ

2.cos θ

3.cot θ

4.tan θ

Posted Date:-2021-12-16 11:11:04


Question:
A current carrying power line carries current from west to east. Then the direction of the magnetic field 2 m above it is :

1.west to east

2. south to north

3.north to south

4.None of the above

Posted Date:-2021-12-16 11:38:01


Question:
A cyclotron can be used to produce high energy:

1.neutrons

2.deutrons

3.β particles

4.α partifcles

Posted Date:-2021-12-16 11:50:58


Question:
A wire of length 2 metre carries a current 1 ampere, is bent to form a circle. The magnetic moment of the coil is :

1. 2Ï€

2.Ï€/2

3.Ï€/4

4.1/Ï€

Posted Date:-2021-12-16 11:41:56


Question:
According to Gauss’s theorem in magnetism, surface integral of magnetic field intensity over a surface (closed or open) is always:

1.-1

2.1

3.0

4.infinity

Posted Date:-2021-12-16 11:48:48


Question:
Circular loop of radius 0.0157 m carries a current 2 A. The magnetic field at the centre of the loop is :

1.1.57 × 10-3Wb/m²

2.8.0 × 10-5 Wb/m²

3.2.0 × 10-3 Wb/m²

4.3.l4 × 10-1 Wb/m²

Posted Date:-2021-12-16 11:17:43


Question:
Earth’s magnetism was discovered by:

1.Gauss

2.Oersted

3.Ampere

4.Gilbert

Posted Date:-2021-12-16 11:48:03


Question:
Isoclinic lines are the lines joining places with :

1.equal dip

2.equal declination

3.equal dip and declination

4.None of the above

Posted Date:-2021-12-16 11:45:48


Question:
same everywhere

1. same everywhere

2. inversely proportional to the distance

3.directly proportional to the distance

4.None of the above

Posted Date:-2021-12-16 11:33:30


Question:
Tesla is a unit of:

1. electric flux

2. magnetic flux

3.magnetic field

4.electric field

Posted Date:-2021-12-16 11:49:32


Question:
The current sensitibility of a moving coil galanometer increases with decrease in:

1.magnetic field

2.area of a coil

3.number of turns

4.None of the above

Posted Date:-2021-12-16 11:10:00


Question:
The force between two parallel current carrying conductors is F. If the current in each conductor is doubled, then the force between them becomes :

1.4F

2.2F

3.F

4.F/4

Posted Date:-2021-12-16 11:39:03


Question:
The magnetic field of a given length of a ware for single turn coil at its centre is B. Then.its value for two turns of coil will be :

1.B/4

2.B/2

3.4B

4.2B

Posted Date:-2021-12-16 11:43:09


Question:
The most suitable metal for making permanent magnets is :

1.iron

2.steel

3.copper

4.aluminium

Posted Date:-2021-12-16 11:46:31


Question:
The permeability of a paramagnetic substance is:

1. very large

2. small but more than unity

3.less than unity

4.negative

Posted Date:-2021-12-16 11:14:07


Question:
The radius of the trajectory of a charged particle in a uniform magnetic field is proportional to the:

1.charge on the particle

2.energy of the particle

3.momentum of the particle

4.All the above

Posted Date:-2021-12-16 11:51:40


Question:
The sensitivity of a tangent galvanometer can be increased by increasing:

1.the radius of the coil

2.the external magnetic field

3. the number of turns of the coil

4.all the above

Posted Date:-2021-12-16 11:12:36


Question:
The SI unit of magnetic dipole moment is’

1.Ampere

2.Ampere metre²

3.Tesla

4.None of the above

Posted Date:-2021-12-16 11:47:23


Question:
The strength of the magnetic field around an infinite current carrying conductor is :

1.same everywhere

2.inversely proportional to the distance

3.directly proportional to the distance

4.None of the above

Posted Date:-2021-12-16 11:29:07


Question:
To convert galvanometer into voltmeter one should connect :

1.high resistance in series with galvanometer

2.low resistance in series with galvanometer

3.high resistance in parallel with galvanometer

4. low resistance in parallel with galvanometer

Posted Date:-2021-12-16 11:45:05


Question:
What happens to the magnetic field at the centre of a circular current carrying coil if we double the radius of the coil keeping the current unchanged?

1.halved

2.doubled

3.quadrupled

4.remains unchanged

Posted Date:-2021-12-16 11:18:45


Question:
What is the angle of dip at the magnetic poles ?

1. 30°

2.0°

3.45°

4.None of the above

Posted Date:-2021-12-16 11:16:16


Question:
When charged particle enters-a uniform magnetic field, its K.E.:

1. remains constant

2.increases

3.decreases

4.becomes zero

Posted Date:-2021-12-16 11:44:06


Question:
When we double the radius of a coil keeping the current through it unchanged, what happens to the magnetic field directed along its axis at far off points?

1.halved

2.doubled

3.quadrupled

4.remains unchanged

Posted Date:-2021-12-16 11:21:09


Question:
Which of the following is not a unit of magnetic induction?

1.gauss

2.tesla

3.oersted

4.weber/metre²

Posted Date:-2021-12-16 11:40:03


Question:
Which of the following shows that the earth behaves as a magnet?

1.Repulsion between like poles .

2.Attraction between unlike poles

3.Null points in the magnetic field of a bar magnet

4.No existence of isolated magnetic poles

Posted Date:-2021-12-16 11:15:30


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