CH-12 Electrostatics Leave a Comment / By abdulslambsn@gmail.com / October 6, 2025 Welcome To Your Quiz "CH-12 Electrostatics" Click on "Start Quiz" To Continue... 1. The value of K depends upon: Charges System of units and medium The distance between charges Nature of medium None 2. The value of K in SI system of units: 9 x 10⁹ Nm² / c² 9 x 10¹⁰ Nm² / c² 9 x 10⁻⁹ Nm² / c² 9 x 10⁹ NC / m² None 3. Metals are good conductors of electricity because they have: Large number of bounded electrons Small number of electrons Large number of free electrons Small number of free electrons None 4. The number of electrons in one coulomb charge is equal to: 6.2 x 10¹⁸ electrons Zero electrons 1.6 x 10⁻²² electrons 6.2 x 10²¹ electrons None 5. A substance contains: Only positive charge Only negative charge Both positive and negative charge None of above None 6. The minimum charge on any electron be less than: 1.6 x 10⁻¹⁹ C 3.2 x 10⁻¹⁹ C 1.8 x 10⁻¹⁹ C 9.1 x 10⁻¹⁹ C None 7. A metallic hallow sphere of 8 cm diameter is charged with 4 x 10⁻⁸ c. The potential on its surface will be: 90 volts 9 volts 9000 volts 900 volts None 8. In case of two identical placed at certain distance, the electric lines of force are: Curved Straight lines Both A and B None of these None 9. Selenium is: Conductor Insulator in the dark are becomes conductor when exposed to light An insulator None of these None 10. The number of electric field lines passing through a certain element of a area is called: Electric lines of force Electric intensity Electric flux None of these None 11. The space around the charge within which other charges are influenced by it is called: Electric field Magnetic field Electric flux Electric intensity None 12. The electric field lines emerge from the charges in: Three dimensions Two dimensions One dimension All of above None 13. The electric lines of force determine the strength of an: Gravitational field Constant field Magnetic field Electric field None 14. Electric flux is a: Vector quantity Scalar quantity Both A and B None of above None 15. The surface charge density is defined as: Charge per unit volume Charge per unit mass Mass per unit area Charge per unit area None 16. Work done in moving a charge [unit positive charge] from one point to another against the electric field is measure of: Electric potential Potential difference Electric intensity Absolute potential None 17. If an electron of charge 'e' is accelerated a potential difference V it will acquire energy: Ve v/e e/v Ve² None 18. In a region where the electric field is zero the electric potential is always: Negative Positive Zero Constant None 19. If a oil droplet between two oppositely charged parallel plates is suspended then: F𝓰 > Fₑ F𝓰 < Fₑ F𝓰 = Fₑ None of these None 20. If electric and gravitational force on an electron placed in a uniform electric field balance each other than electric intensity will be: E = q/mg E = mg/q E = q/qm E = m/qg None 21. The relative permitivity of air is: 79.5 1.006 1.06 1.0006 None 22. The voltage across the capacitor at any instant can be obtained by: Dividing q by C Dividing C by q Multiply q by C None of these None 23. The potential at a point suited at a distance of 50 cm from a charge of 5 uc is: 9 x 10⁴ volts 9 x 10² volts 9 x 10⁻² volts 9 x 10⁻⁴ volts None 24. A charge of 0.10 C accelerated through a potential difference of 1000 Volt acquires K.E: 100 J 200 J 100 eV 400 J None 25. The charge time of the capacitor depends open: R x C R/C R x L RL/C None 26. The energy supplied in charging a capacitor resides after the charging in: The battery The electric field The magnetic field None of these None 27. A system of two equal and opposite charges separated by a small distance is called: A dipole Inductance A capacitor A condenser None 28. If a dielectric is placed between the plates of capacitor, its capacitance will be: Increase Decrease Becomes double None of these None 29. If the distance between two charges is doubled, the force between them: Four times One fourth Half Remain same None 30. The number of electrons in one coulomb charge: Zero 1.6 x 10⁻¹⁹ 6.2 x 10⁻¹⁹ 6.2 x 10¹⁸ None 31. A force of 0.01 N is exerted on a charge 1.2 x 10⁻⁵ C at a certain point. The electric field at that point is: 1.2 x 10⁴ N/C 1.2 x 10⁴ C/N 8.3 x 10² N/C 8.3 x 10⁻² N/C None 32. Two metallic sphere of radius 2 cm and 4 cm get equal quantity of charge. Which has greater surface charge density? 2ⁿᵈ sphere Both have same First sphere None of these None 33. The number of lines per unit area passing perpendicular through an area is called: Flux Electric intensity Both A and B None of these None 34. The apparatus used by coulomb is: Cavendish Torsion balance Physical balance Gold leaf electroscope None 35. Capacitance of capacitor is increases by decreasing: Area of plates Medium Distance between plates None of these None 36. An electric field cannot deflect: X-rays a-particles B-particles None of these None 37. In the xerographic machine, the heart of machine drum is made of: Ceramic Semi-conductor Strong Plastic Aluminum None 38. If a charge body moved against the electric field it will gain: Potential energy Kinetic energy Mechanical energy Electric potential energy None 39. The circuit having combined components resistance and capacitor is called: R-L circuit R-C circuit R-L.C circuit R-I circuit None 40. Capacitance and potential difference are: Directly proportional Equal Constant Inversely proportional None 1 out of 8 Thanks For Taking This Quiz - Please See Your Answers/Results Below After Entering Your Name & Email... Name Email Time's up
