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Electricity

99 MCQ questions with answers and explanations · page 1 of 4

Test yourself▶ 25 question test▶ 50 question test

Q1. When a glass rod is rubbed with silk, the rod-

  1. Abecomes negatively charged
  2. Bbecomes positively charged
  3. Cremains indifferent
  4. Dfirst negatively charged then positively charged
Show answer & explanation

Answer: B) becomes positively charged

Q2. The total charge of a charged conductor is its-

  1. Aresides on the inside page
  2. Blives on an external page
  3. CSome are on the inner page and some are on the outer page.
  4. DAll are true
Show answer & explanation

Answer: B) lives on an external page

Q3. The force between two electric charges is related to-

  1. AAmpere's law
  2. BCoulomb's law:
  3. CFaraday's law
  4. DOhm's law
Show answer & explanation

Answer: B) Coulomb's law:

Q4. If the distance between two electric charges is halved, then the value of the electric force between them will become-

  1. Ahalf
  2. Bdouble
  3. Cquadruple
  4. Done fourth
Show answer & explanation

Answer: C) quadruple

Q5. Equal charges have-

  1. AAttraction
  2. Badhesion
  3. CDistractions
  4. Dcohesion
Show answer & explanation

Answer: C) Distractions

Q6. When an ebonite rod is rubbed against the skin of a cat, the ebonite rod-

  1. Abecomes negatively charged
  2. BIt becomes positively charged.
  3. Cremains indifferent
  4. Dfirst negatively charged then positively charged
Show answer & explanation

Answer: A) becomes negatively charged

Q7. The charging of objects occurs as a result of the transfer of-

  1. Aelectron
  2. BPositron
  3. CProton
  4. DNeutron
Show answer & explanation

Answer: A) electron

Q8. You're traveling in a car. To stay safe if lightning is about to strike:

  1. Aclose the car windows
  2. Bopen the car windows
  3. CGet out of the car and sit down
  4. Dsit on top of the car
Show answer & explanation

Answer: A) close the car windows

Q9. The force between two stationary charges is directly proportional to the product of their quantities and inversely proportional to the square of the distance between them." This law is—

  1. AOhm's law
  2. BKirchhoff's law
  3. CCoulomb's law
  4. DFaraday's law
Show answer & explanation

Answer: C) Coulomb's law

Q10. It is measured by the work done in moving a unit positive charge from one point to another in an electric circuit, the distance between those points-

  1. Ato resistance
  2. Bto the potential difference
  3. Cto the stream
  4. Dthe strength of the electric current
Show answer & explanation

Answer: B) to the potential difference

Q11. Metals are good conductors of electricity because-

  1. Athey contain free electrons
  2. Btheir atoms are lighter
  3. Ctheir melting point is high
  4. DAll of the above
Show answer & explanation

Answer: A) they contain free electrons

Q12. Which of the following is the best conductor of electricity?

  1. ACopper
  2. BIron
  3. Caluminum
  4. DSilver
Show answer & explanation

Answer: D) Silver

Q13. The characteristic of a superconductor is-

  1. AHigh permeability
  2. Blow permeability
  3. CZero permeability
  4. DInfinite permeability
Show answer & explanation

Answer: A) High permeability

Q14. Which of the following is not a semiconductor?

  1. AGermanium
  2. BSilicon
  3. CSelenium
  4. DArsenic
Show answer & explanation

Answer: D) Arsenic

Q15. Those substances which do not have free electrons in normal state, but free electrons can be obtained under special conditions like high temperature or by adding impurities, are called-

  1. Agood conductor material
  2. Binsulator material
  3. Cdielectric material
  4. Dsemiconductor material
Show answer & explanation

Answer: D) semiconductor material

Q16. What is the effect of conductive materials on electrical insulation and electrical conductivity when the temperature is increased?

  1. AElectrical resistance increases, while electrical conductivity decreases
  2. BElectrical resistance decreases, while electrical conductivity increases.
  3. CBoth electrical resistance and electrical conductivity increase.
  4. DBoth electrical resistance and electrical conductivity decrease
Show answer & explanation

Answer: A) Electrical resistance increases, while electrical conductivity decreases

Q17. Copper is mainly used for conducting electricity because-

  1. AIt has a high melting point
  2. BIt is cheap.
  3. CIt is very durable
  4. DIts electrical resistivity is low
Show answer & explanation

Answer: D) Its electrical resistivity is low

Q18. Which of the following is the unit of electric current?

  1. AKelvin
  2. Bmole
  3. Ccandela
  4. DAmpere
Show answer & explanation

Answer: D) Ampere

Q19. Electric current does not flow between two connected charged objects if they are-

  1. Aon the same charge
  2. Bat the same capacity
  3. Cat the same resistance
  4. Dat the same potential
Show answer & explanation

Answer: D) at the same potential

Q20. By what is alternating current converted into direct current?

  1. AFilter
  2. BRectifier
  3. CMotor
  4. DTransformers
Show answer & explanation

Answer: B) Rectifier

Q21. In electrical fittings, one wire is earthed. This is because:

  1. AIf a short circuit occurs, the current will flow to ground.
  2. BThis does not cause loss of electricity
  3. CThis completes the electrical circuit
  4. DThis removes the fluctuation of electricity.
Show answer & explanation

Answer: A) If a short circuit occurs, the current will flow to ground.

Q22. Earth is used in electrical equipment for-

  1. Ato reduce expenses
  2. BBecause the appliances operate on 3-phase
  3. CFor safety
  4. DAs a fuse
Show answer & explanation

Answer: C) For safety

Q23. What is the resistance of an ideal voltmeter?

  1. AZero
  2. BLower
  3. CUnlimited
  4. DHigh
Show answer & explanation

Answer: C) Unlimited

Q24. The algebraic sum of the currents meeting at a point in a circuit is-

  1. Ainfinite
  2. BZero
  3. Cbetween zero and infinity
  4. Dnone of the above
Show answer & explanation

Answer: B) Zero

Q25. A conductor has a resistance of 440 ohms. How much current will flow through it if it is connected to a 110 volt source?

  1. A0.5A
  2. B0.25A
  3. C4A
  4. D1.25A
Show answer & explanation

Answer: B) 0.25A

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