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25 Questions

1. The potential on the surface of a charged metallic sphere of radius 5 cm is 10 volt. The potential at the centre of the sphere will
2. For permanent magnets the value of H is
3. The magnetic lines of force like electrical lines of force
4. The use of Helmholtz coils is to produce
5. A positive point charge Q is brought near an isolated metal cube
6. What will be the self inductance of a coil, to be connected in series with a resistance of such that the phase difference between the emf and the current at 50 Hz frequency is 30°?
7. The ozone layer in earth's atmosphere is crucial for human survival because it
8. The ratio of total intensities of magnetic field at the equator and the poles will
9. A bar magnet of magnetic dipole moment is cut into two halves by a horizontal plane. Which of the following statements is correct?
10. The distance between the plates of a parallel plate air condenser is d. If a copper plate of same area but thickness d/2 is placed between the plates then the new capacitance will become
11. Which of the following is NOT the charcteristic/use of ferrites?
12. Electromagnetic waves are produced by
13. If there were no atmosphere, the average temperature on the surface of the earth would be
14. A spherical volume has a uniformly distributed charge density 2 × 10'4 Cm'3. The electric field at a point inside the volume at a distance 4.0 cm from the centre is
15. The self-inductance of a coil is 2 Henry and 5its resistance is 20 Ω. The value of current in it changes from 10A to 9A in 0.01 s. The time constant of the coil will be
16. The nature of a parallel AC circuit at a frequency greater than the resonant frequency, will be
17. An isolated solid metal sphere is given a charge Q. The charge will be distributed on the sphere
18. The phenomenon of production of magnetic field on passing an electric current in a straight conducting wire is based on the law of
19. The magnetic property inherent in all materials is
20. A certain piece of copper is to be shaped into a conductor of minimum resistance. Its length and diameter should be, respectively
21. The velocities of two identical particles entering a uniform magnetic field are in the ratio 1 : 3. Their path becomes circular in the magnetic field. The ratio of the radii of their circular paths will be
22. Chemical equivalent, of a substance is W. To obtain its electrochemical equivalent, we should multiply W with ece of
23. 64 water drops having equal charges combine to form one bigger drop. The capacitance of bigger drop, as compared to that of smaller drop will be
24. A man wants to test his ammeter whose range is 0'1 ampere. He connects it to a 12 V storage battery and a carbon resistance of 48 ohm 0.5 watt. Which of the following is most likely to happen?
25. A primary cell has emf 2 volt. When short circuited it gives a current of 4 ampere. Its internal resistance in ohms will be

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