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

1.12 cm

2.16 cm

3.11 cm

4.18 cm

1.0°

2.45°

3.90°

4.180°

1. sin θ

2.cos θ

3.cot θ

4.tan θ

## 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

1.neutrons

2.deutrons

3.β particles

4.α partifcles

1. 2π

2.π/2

3.π/4

4.1/π

1.-1

2.1

3.0

4.infinity

## 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

1.Gauss

2.Oersted

3.Ampere

4.Gilbert

## 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

## Question: `same everywhere`

1. same everywhere

2. inversely proportional to the distance

3.directly proportional to the distance

4.None of the above

1. electric flux

2. magnetic flux

3.magnetic field

4.electric field

## 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

1.4F

2.2F

3.F

4.F/4

1.B/4

2.B/2

3.4B

4.2B

1.iron

2.steel

3.copper

4.aluminium

## Question: `The permeability of a paramagnetic substance is:`

1. very large

2. small but more than unity

3.less than unity

4.negative

## 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

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

2.the external magnetic field

3. the number of turns of the coil

4.all the above

## Question: `The SI unit of magnetic dipole moment is’`

1.Ampere

2.Ampere metre²

3.Tesla

4.None of the above

## 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

## 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

## 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

4.remains unchanged

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

1. 30°

2.0°

3.45°

4.None of the above

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

1. remains constant

2.increases

3.decreases

4.becomes zero

## 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

4.remains unchanged

1.gauss

2.tesla

3.oersted

4.weber/metre²

## 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

## More MCQS

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