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


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°


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


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


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

1.neutrons

2.deutrons

3.β particles

4.α partifcles


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. 2π

2.π/2

3.π/4

4.1/π


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


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


Question:
Earth’s magnetism was discovered by:

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


Question:
Tesla is a unit of:

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


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


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


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

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:

1.the radius of the coil

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

3.quadrupled

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

3.quadrupled

4.remains unchanged


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

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

  1. NCERT Societal Impact MCQ
  2. MCQ Questions for Class 12 Maths Chapter 1 Relations and Functions
  3. MCQ Questions for Class 12 Physics Chapter 1 Electric Charges and Field
  4. MCQ Questions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance
  5. Current Electricity Class 12 MCQs Questions
  6. MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism
  7. MCQ Questions for Class 12 Physics Chapter 5 Magnetism and Matter
  8. MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction
  9. MCQ Questions for Class 12 Physics Chapter 7 Alternating Current
  10. MCQ Questions for Class 12 Physics Chapter 8 Electromagnetic Waves
  11. MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments
  12. MCQ Questions for Class 12 Physics Chapter 10 Wave Optics
  13. MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter
  14. MCQ Questions for Class 12 Physics Chapter 12 Atoms
  15. MCQ Questions for Class 12 Physics Chapter 13 Nuclei
  16. MCQ Questions for Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits
  17. MCQ Questions for Class 12 Physics Chapter 15 Communication Systems
  18. MCQ Questions for Class 12 English
  19. MCQ Questions for Class 12 English Flamingo Chapter 3 Deep Water
  20. MCQ Questions for Class 12 English Flamingo Chapter 4 The Rattrap
  21. Human Geography: Nature and Scope Class 12 MCQs Questions
  22. MCQ Questions for Class 12 Geography Chapter 2 The World Population: Distribution, Density and Growth
Search
R4R Team
R4Rin Top Tutorials are Core Java,Hibernate ,Spring,Sturts.The content on R4R.in website is done by expert team not only with the help of books but along with the strong professional knowledge in all context like coding,designing, marketing,etc!