Quiz  /  Electrostatics Class 12 MCQ Questions With Answers

  • 1. 
    Which of the following is a false statement about electrostatic force.

  • Bringing charges closer together strengthen the force.
  • The electrostatic constant remains the same.
  • The values of the two charges is always the same.
  • Electrostatic force can be attractive or repulsive

  • 2. 
    A negatively charged rod touches the knob of a neutral electroscope. Which best represents the distribution of charge on the electroscope.

  • both the knob and leaves become positive
  • both the knob and leaves become negative
  • the knob becomes negative and the leaves become positive
  • the knob becomes positive and the leaves become negative

  • 3. 
    When an object gains electrons it becomes __________

  • Neutral
  • Positively charged
  • Negatively charged

  • 4. 
    Charging by ___ creates 2 objects with the same charge

  • Induction
  • Conduction
  • Friction

  • 5. 
    What is the unit of electric charge?

  • Volts
  • Amps
  • Coulombs
  • Ohms

  • 6. 
    Two charged parallel plates that are 2.0 × 10–2 m apart have an electric field between them with a magnitude of 1600 N/C. What is the electric potential difference between the plates?

  • 32 V
  • 23.5 V
  • 80,000 v
  • .0000125 V

  • 7. 
    A negatively charged particle has

  • more protons than electrons
  • more electrons than protons
  • neutrons and protons but no electrons
  • an equal number of protons and electrons

  • 8. 
    An electroscope has an excess of 3.9 × 108 electrons. What is the charge on the electroscope?

  • 1.6 × 10–11 C
  • 2.4 × 10–11 C
  • 4.1 × 10–11 C
  • 6.2 × 10–11 C

  • 9. 
    Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.

  • +,+
  • +,-
  • -,+
  • -,-

  • 10. 
    There is _____________ between an electron and a proton.

  • an attractive force
  • a repulsive force
  • no force

  • 11. 
    A glass rod becomes positively charged when it is rubbed with silk. This net positive charge accumulates because the glass rod

  • gains electrons
  • loses electrons
  • gains protons
  • loses protons

  • 12. 
    A device that uses electrical energy to cause an object to rotate is a:

  • Generator
  • Transformer
  • Motor
  • Electromagnet

  • 13. 
    Consider the electric field lines as shown in the diagram. Which of the following gives the correct sign for charge X and Y

  • X: PositiveY: Positive
  • X: PositiveY: Negative
  • X: NegativeY: Negative
  • X: NegativeY: Positive

  • 14. 
    Rubbing your hair with a balloon and causing it to stand up is an example of...

  • Friction
  • Induction
  • Conduction
  • Polarization

  • 15. 
    Which is true of conductors and insulators?

  • Conductors allow electrons to move from atom to atom, while insulators do not allow electrons to flow and do not allow electricity to flow!
  • Insulators provide pathways for protons to move along to allow the electricity to flow the other way.

  • 16. 
    Consider the conduction charging shown.

  • Electrons move from the insulating stand into the sphere.
  • Protons move from the bar into the sphere.
  • Electrons move from the charged metal bar into the sphere.
  • Protons move from the sphere into the negatively charged bar.

  • 17. 
    Charging by ___ creates a polarized, but neutral object.

  • Conduction
  • Induction
  • Friction

  • 18. 
    Polarization is the temporary sorting of positives and negatives.

  • True
  • False

  • 19. 
    Charge is neither created nor destroyed.

  • True
  • False

  • 20. 
    When two objects are rubbed together, there is a transfer of electrons. How do you determine which object acquires the transferred electrons?

  • Always transfer from the bigger to the smaller object, to make it even
  • Transfer is based on the initial charge of the two objects
  • Transfer is based on how much electron affinity that each object has
  • Always transfer from the more negative to the more positive object

  • 21. 
    When an image is created using a converging lens, the image is ALWAYS

  • Virtual and Inverted
  • Real and Inverted
  • Virtual and upright
  • Real and upright

  • 22. 
    Plastic is an example of _______.

  • an insulator
  • a conductor

  • 23. 
    A material in which electrons are able to move easily

  • Circuit
  • Insulator
  • Resistance
  • Conductor

  • 24. 
    Which of the following forces are examples of things that create or that are a field force?

  • Magnets
  • Gravity
  • Normal Force
  • Electrostatic Force
  • Electrostatic Force, Magnets and Gravity all create or are field forces

  • 25. 
    The distance between two charges doubles at the same time that the charge on each also doubles. What happens to the electric force?

  • doubles
  • quadruples
  • cut in half
  • no change

  • 26. 
    What is the force between 10 C and 5 C charges placed 1 m apart?

  • 4.5 x 1010 N
  • 1.24 x 108 N
  • 4.5 x 109 N
  • 4.5 x 1011 N

  • 27. 
    What is the end result of charging by friction?

  • Both object have the same charge, so they will attract one another
  • Both object have the same charge, so they will repel one another
  • Both object have the opposite charge, so they will attract one another
  • Both object have the opposite charge, so they will repel one another

  • 28. 
    Would a +4 C charge and a -5 C attract or repel each other?

  • attract
  • repel

  • 29. 
    A(n) is material in which charges will move easily

  • Conductor
  • Insulator
  • Vacuum

  • 30. 
    The electric field in a certain region of space is 30 N/C. What is the force on a 2 C charge in that space?

  • 32 N
  • 15 N
  • 60 N
  • 45 N
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