NCERT Class 12 MCQ Quiz Hub

MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism

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




2. 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:




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




4. The permeability of a paramagnetic substance is:




5. Which of the following shows that the earth behaves as a magnet?




6. What is the angle of dip at the magnetic poles ?




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




8. 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?




9. 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?




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




11. same everywhere




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




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




14. Which of the following is not a unit of magnetic induction?




15. 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 :




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




17. 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 :




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




19. To convert galvanometer into voltmeter one should connect :




20. Isoclinic lines are the lines joining places with :




21. The most suitable metal for making permanent magnets is :




22. The SI unit of magnetic dipole moment is’




23. Earth’s magnetism was discovered by:




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




25. Tesla is a unit of:




26. 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:




27. A cyclotron can be used to produce high energy:




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