Electrostatics MCQs for MDCAT Practice

Physics section, Electrostatics chapter. Sample questions from past PMC papers.

1. Question 1
   The force of repulsion between two charges is considered as:
   • A.-ve
   • B.May be +ve or -ve
   • C.Cannot be predicted
   • D.+ve
   Sign up free to see the explanation, distractor analysis, and add this to your spaced repetition deck.
2. Question 2
   Electric field lines never cross each other. Why?
   • A.ecause electric field lines are always straight and cannot bend.
   • B.ecause electric field lines are imaginary and do not physically exist.
   • C.ecause at the point of crossing, the electric field would have two different directions, which is impossible.
   • D.ecause electric field lines can cross if the charges are equal in magnitude.
   Sign up free to see the explanation, distractor analysis, and add this to your spaced repetition deck.
3. Question 3
   The units of the electric field are:
   • A.JC^(-1)
   • B.JC
   • C.Jm^(-1)
   • D.JC^(-1)m^(-1)
   Sign up free to see the explanation, distractor analysis, and add this to your spaced repetition deck.
4. Question 4
   A parallel plate air capacitor has a capacity of 2 pF. If the separation between its plates is doubled and a mica sheet is introduced between its plates, Its capicity becomes 6 pF. What Is the dielectric constant of mica?
   • A.6
   • B.5
   • C.4
   • D.3
   Sign up free to see the explanation, distractor analysis, and add this to your spaced repetition deck.
5. Question 5
   Two plates are 2cm apart, a potential difference of 10 volt is applied between them, the electric field between the plates is:
   • A.20 N/C
   • B.500N/C
   • C.5 N/C
   • D.250 N/C
   Sign up free to see the explanation, distractor analysis, and add this to your spaced repetition deck.
6. Question 6
   The negative of the potential gradient is equal to:
   • A.Electric field intensity
   • B.Electric flux
   • C.Magnetic intensity
   • D.Magnetic flux
   Sign up free to see the explanation, distractor analysis, and add this to your spaced repetition deck.
7. Question 7
   Two similar charges each of one coulomb placed in the air one meter apart repel each other with a force:
   • A.9×109 N
   • B.9.2×104 N
   • C.9×108 N
   • D.9×1010 N
   Sign up free to see the explanation, distractor analysis, and add this to your spaced repetition deck.
8. Question 8
   State some similarities and some differences between electric fields and gravitational fields.
   • A.oth fields are conservative and obey the inverse square law, but only electric fields can be repulsive.
   • B.oth fields are conservative and obey the inverse square law, but only gravitational fields can be repulsive.
   • C.oth fields are conservative and obey the inverse square law, but only gravitational fields can be attractive.
   • D.oth fields follow an inverse square law, but only electric fields can be attractive or repulsive.
   Sign up free to see the explanation, distractor analysis, and add this to your spaced repetition deck.