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Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 9 (25 MCQs)

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1. According to Coulomb's Law, The greater the separation distance between two charges the greater the magnitude of the electric force. True or False?
2. According to quantisation of charge q = .....
3. Which of the following statements is false about electric field lines
4. What is the SI unit used to measure force?
5. What is the direction of the electric field for a positive charge?
6. Electric field, at any point, distant r from a power line varies:
7. An electron of mass M, initially at rest, moves through a certain distance in a uniform electric field in time t1, A proton of mass Mp also initially at rest takes time t2 to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio t2/t1, is nearly equal to:
8. What is the unit of electric intensity in the context of physics?
9. The force per unit charge is known as .....
10. Which of the following is true about electric field strength?
11. Four charges +8C, -3C, +5C and-10C are kept inside a closed surface. What will be the outgoing flux through the surface?
12. In the process of charging, the mass of the negatively charged body-
13. SI unit of electric flux is .....
14. Two charges $3\times10^{-5}C$ $5\times10^4C$
15. Electric charges that are unlike ..... each other.
16. There is a solid sphere of radius 'R' having uniformly distributed charge. What is the relation between electric field 'E' (inside the sphere) and radius of sphere 'R' is
17. The ratio of the forces between two small spheres with constant charge (a) in air (b) in a medium of dielectric constant K is
18. A positively charged ball hangs from a silk thread. We put a positive test charge q0 at a point measure E / q0 . Then, it can be predicted that the electric field strength E:
19. The number of electric field of lines emerged out from 1 C charge is ..... (e$_{o}$ = 8.85 x 10$^{-12}$ MKS).
20. A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the electric flux will .....
21. What does it mean when the electric field lines are close together?
22. A charge q is placed at the center of the line joining the two equal charges Q. This system of three charges will be in equilibrium if q is equal to:
23. When an electron and a proton are both placed in an electric field, .....
24. The mass of a single electron is equal to 9.109x10$^{-31}$C. True or False?
25. A hollow pipe of diameter D and length L is filled with water uniformly. The water flow through the pipe will be proportional to:
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