Electrostatics in Physics Solved MCQs

 Electrostatics in Physics 

1. What happens when two objects with the same type of charge are brought close together?

a) They attract each other  

b) They repel each other  

c) Their charges neutralize  

d) Nothing happens  

2. What is the SI unit of electric charge?

a) Coulomb  

b) Ampere  

c) Volt  

d) Ohm  

3. When a charged object is grounded, it:

a) Gains more charge  

b) Loses some or all of its charge  

c) Maintains its charge  

d) Changes color  

4. Which law describes the force between two charged objects?

a) Newton's Law of Motion  

b) Coulomb's Law  

c) Ohm's Law  

d) Boyle's Law  

5. Which of the following materials is a good conductor of electricity?

a) Rubber  

b) Wood  

c) Copper  

d) Glass  

6. What type of charge does a proton carry?

a) Positive  

b) Negative  

c) Neutral  

d) Variable  

7. The process of transferring charge between objects by touching is called:

a) Induction  

b) Conduction  

c) Insulation  

d) Radiation  

8. The study of stationary electric charges is known as:

a) Electrodynamics  

b) Electrostatics  

c) Electromagnetism  

d) Electrokinetics  

9. When two positively charged objects are brought close together, what happens to the force between them?

a) It decreases

b) It remains the same

c) It increases

d) It becomes zero

10. What happens when a positively charged object is brought near a neutral object?

a) The neutral object gains a positive charge

b) The neutral object gains a negative charge

c) The neutral object remains neutral

d) The neutral object loses electrons

11. What is electrostatic charging by induction?

a) Transfer of electrons between objects  

b) Charging objects by direct contact  

c) Charging objects without direct contact  

d) None of the above  

12. When a negatively charged object is brought near a neutral object, what happens during electrostatic induction?

a) Electrons are transferred from the negatively charged object to the neutral object  

b) Protons are transferred from the negatively charged object to the neutral object  

c) Electrons are transferred from the neutral object to the negatively charged object  

d) Protons are transferred from the neutral object to the negatively charged object  

13. What is the charge on the initially neutral object after electrostatic induction?

a) Positive  

b) Negative  

c) Neutral  

d) Cannot be determined  

14. In electrostatic induction, what type of charge does the induced object acquire?

a) Same as the inducing object  

b) Opposite to the inducing object  

c) No charge  

d) Equal to the inducing object  

15. What is the key factor in electrostatic induction?

a) Direct contact between objects  

b) Distance between objects  

c) Material composition of objects  

d) Polarization of objects  

16. What is the primary function of an electroscope?

   a. Measure electric current

   b. Detect electric charge

   c. Generate electricity

   d. Store electric energy

17. How does an electroscope indicate the presence of electric charge?

   a. Changes color

   b. Produces sound

   c. Shows deflection

   d. Emits light

18. Which material is commonly used in the construction of the leaves of an electroscope?

   a. Rubber

   b. Copper

   c. Aluminum

   d. Paper

19. What happens to the leaves of an electroscope when it is charged by induction?

   a. They collapse

   b. They repel each other

   c. They attract each other

   d. They remain unaffected

20. What is the purpose of an insulating material in an electroscope?

   a. To conduct electricity

   b. To prevent electric charge

   c. To enhance deflection

   d. To reduce sensitivity

21. What is an anelectroscope?

   a. A type of electric generator

   b. An instrument to measure voltage

   c. A device to discharge electric charge

d. A modified electroscope with insulated leaves

22. In an anelectroscope, what happens when an electrically charged object is brought near it?

   a. The leaves collapse

   b. The leaves attract each other

   c. The leaves remain unchanged

   d. The leaves repel each other

23. What distinguishes an anelectroscope from a regular electroscope?

   a. Material of the leaves

   b. Presence of insulating material

   c. Size of the instrument

   d. Method of charge detection

24. According to Coulomb's law, the force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. What is the mathematical expression for this law?

• a) $�=\frac{�\cdot {�}_1\cdot {�}_2}{�}$
• b) $�=�\cdot {�}_1\cdot {�}_2\cdot {�}^2$
• c) $�=\frac{{�}_1+{�}_2}{{�}^2}$
• d) $$�=�⋅�1⋅�2�2

25. What does Coulomb's law describe?

  a. Magnetic fields

   b. Electric fields

   c. Gravitational fields

   d. Sound waves

26. In Coulomb's law, what does 'q' represent?

   a. Distance

   b. Charge

   c. Mass

   d. Time

27. If the distance between two charges is halved, 

how does the electrostatic force change?

a. Doubles

b. Quadruples

c. Halves

d. Stays the same

28. What is electrostatic potential energy?

a) The energy stored in a charged object  

b) The energy due to the motion of charged particles  

c) The energy associated with the arrangement 

of charged particles  

d) The energy of a charged particle due to 

its position in an electric field

29. What is the unit of electric potential?

a) Joule  

b) Coulomb  

c) Volt  

d) Tesla  

30. How is electric potential (V) related to 

electrfield (E) and distance (d)?

a) V = Ed  

b) V = E × d  

c) V = E/d  

d) V = E + d  

31. What is the work done in moving a charge 

of 2 C across a potential difference of 10 V?

a) 5 J  

b) 20 J 

c) 0.2 J  

d) 50 J  

32. The potential energy of a system of charges 

is maximum when:

a) Charges are far apart  

b) Charges are close together  

c) Charges have the same sign  

d) Charges are stationary  

33. What is a capacitor?

   a) A device that generates electrical power

 b) A component that stores and releases electrical energy

   c) A type of resistor

   d) An insulator

34. What is the unit of capacitance?

   a) Ohm

   b) Farad

   c) Volt

   d) Ampere

35. How does a capacitor store energy?

   a) By converting it into heat

   b) By storing electrons on metal plates

   c) By creating magnetic fields

   d) By generating light

36. What is the primary function of capacitors in electronic circuits?

   a) To control current flow

   b) To amplify signals

   c) To store and release electrical energy

   d) To generate magnetic fields

37. In which electric appliances are capacitors commonly used?

   a) Refrigerators

   b) Washing machines

   c) All of the above

   d) None of the above

38. What role do capacitors play in a motor's starting mechanism?

   a) They regulate voltage

b) They store energy for the motor to start

   c) They amplify signals

   d) They control current flow

39. Why are capacitors used in power supply circuits?

   a) To generate heat

   b) To store and stabilize voltage

   c) To create magnetic fields

   d) To control resistance

40. What happens when capacitors are connected in series?

   a) Their capacitance adds up

   b) Their capacitance decreases

   c) Their voltage adds up

   d) Their voltage decreases

41. What is the purpose of the dielectric material in a capacitor?

   a) To increase resistance

   b) To decrease capacitance

   c) To store more charge

   d) To act as an insulator

42. In an AC circuit, how does the capacitance affect the current and voltage relationship?

 a) They are in phase

 b) They are out of phase

c) Capacitance has no effect on the relationship

 d) Voltage lags behind the current

43. What happens to the total capacitance when capacitors are connected in series?

   a. Increases

   b. Decreases

   c. Remains constant

   d. Depends on the capacitor values

44. In a parallel capacitor arrangement, how does the total capacitance behave?

   a. It increases

   b. It decreases

   c. Remains constant

   d. Depends on the capacitor values

45. When capacitors are connected in series, how does the voltage across each capacitor compare?

   a. Equal

   b. Proportional to capacitance

   c. Inversely proportional to capacitance

   d. Dependent on the applied voltage

46. What effect does adding a capacitor in parallel have on the total resistance in an electrical circuit?

   a. Increases resistance

   b. Decreases resistance

   c. No effect on resistance

   d. Depends on the capacitor values

47. What is the primary function of a grid station in an electrical power system?

   a. Power generation

   b. Power distribution

   c. Power consumption

   d. Power transformation

48. Which component is responsible for stepping up voltage at a grid station before transmission?

   a. Transformer

   b. Generator

   c. Circuit breaker

   d. Capacitor

49. What is the purpose of a power house in the context of electricity generation?

   a. Voltage regulation

   b. Power distribution

   c. Power generation

   d. Power consumption

50. In a grid station, what role does a circuit breaker play?

   a. Voltage control

   b. Overcurrent protection

   c. Power distribution

   d. Frequency regulation

51. What is the function of a capacitor in a grid station?

   a. Voltage regulation

   b. Current protection

   c. Power generation

   d. Frequency control

52. What is the main difference between a grid station and a power house?

   a. Location

   b. Voltage level

   c. Power generation

   d. Equipment used

53. Which type of energy conversion occurs in a power house during electricity generation?

   a. Mechanical to electrical

   b. Thermal to mechanical

   c. Electrical to mechanical

   d. Chemical to electrical

54. What is the purpose of a step-down transformer at a grid station?

   a. Increase voltage

   b. Decrease voltage

   c. Control frequency

   d. Generate power

55. What is the significance of synchronizing generators in a power house?

   a. Voltage control

   b. Frequency regulation

   c. Overcurrent protection

   d. Power distribution

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