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Electricity

99 MCQ questions with answers and explanations · page 3 of 4

Test yourself▶ 25 question test▶ 50 question test

Q51. Fluorescent tubes are preferred over electric bulbs because-

  1. AIts illuminating surface is large
  2. BIt is not affected by voltage fluctuations
  3. CElectrical energy in the tube is almost completely converted into light energy
  4. DIts light is not harmful to the eyes.
Show answer & explanation

Answer: C) Electrical energy in the tube is almost completely converted into light energy

Q52. Tungsten is used in the manufacture of filament of electric bulb because it-

  1. Ahas high specific resistance
  2. Bhas low specific resistance
  3. CHas high light emission capacity
  4. Dhas a high melting point
Show answer & explanation

Answer: D) has a high melting point

Q53. Nichrome wire is used as a heating element because-

  1. AIts strings can be pulled
  2. BIts specific resistance is high
  3. CDoes not form oxide when heated red hot
  4. DBecause of both b and c above
Show answer & explanation

Answer: D) Because of both b and c above

Q54. Approximately how much of the energy consumed in a tube light is converted into light?

  1. A30-40%
  2. B40-50%
  3. C50-60%
  4. D60-70%
Show answer & explanation

Answer: D) 60-70%

Q55. The household appliance based on the heating effect of electric current is-

  1. Aelectric heater
  2. Belectric bulb
  3. Ctube light
  4. DAll of the above
Show answer & explanation

Answer: D) All of the above

Q56. A 100-watt electric lamp is used for 10 hours a day. How many units of energy does the lamp consume in a day?

  1. A1 unit
  2. B0.1 unit
  3. C10 units
  4. D100 units
Show answer & explanation

Answer: A) 1 unit

Q57. If a 100 watt electric bulb burns for 10 hours, then the electricity cost at the rate of ₹5 per unit will be-

  1. A₹ 5
  2. B₹ 10
  3. C₹ 25
  4. D₹ 50
Show answer & explanation

Answer: A) ₹ 5

Q58. Kilowatt hour is the unit of what?

  1. Apotential difference
  2. Belectric power
  3. Celectrical energy
  4. Delectric potential
Show answer & explanation

Answer: C) electrical energy

Q59. The electricity consumption bill is based on the measurement of 1. Wattage 2. Voltage 3. Ohm 4. Ampere Choose the correct answer from the codes given below:

  1. Aonly 1
  2. B1 and 2
  3. C2 and 3
  4. D1 and 4
Show answer & explanation

Answer: A) only 1

Q60. 100 W electric bulb is used for 10 hours a day. How many units of energy will be used in 30 days?

  1. A1
  2. B10
  3. C30
  4. D300
Show answer & explanation

Answer: C) 30

Q61. Who invented the lightning conductor?

  1. AGraham Bell
  2. BLord Lister
  3. CBenjamin Franklin
  4. DEinstein
Show answer & explanation

Answer: C) Benjamin Franklin

Q62. Lightning conductors are made of-

  1. Aof iron
  2. Bof aluminum
  3. Ccopper
  4. Dof steel
Show answer & explanation

Answer: C) copper

Q63. Statement 'A' and reason 'R' are given below. Study and select the correct answer from the codes given below. Statement (A) Lightning conductors protect buildings from destruction. Reason (R) They transmit the electric charge to the earth.

  1. ABoth A and R are correct and R is the correct reason for A
  2. BBoth A and R are correct, but R is not the correct reason for A
  3. CA is correct, but R is wrong.
  4. DA is wrong, but R is correct
Show answer & explanation

Answer: A) Both A and R are correct and R is the correct reason for A

Q64. The filament of an electric bulb glows when current flows through it, but the wires carrying current to the filament do not glow. This is because:

  1. AMore current flows through the filament than through the wire
  2. BThe resistance of the filament is less than that of the wire
  3. CThe resistance of the filament is higher than that of the wire
  4. DOnly tungsten metal glows when electric current is passed through it.
Show answer & explanation

Answer: C) The resistance of the filament is higher than that of the wire

Q65. Which one of the following non-metals is not a poor conductor of electricity?

  1. ASulphur
  2. BSelenium
  3. Cbromine
  4. DPhosphorus
Show answer & explanation

Answer: B) Selenium

Q66. Which of the following are used as electrolytes in a dry match (battery)?

  1. AAmmonium chloride and zinc chloride
  2. Bsodium chloride and calcium chloride
  3. CMagnesium Chloride and Zinc Chloride
  4. DAmmonium chloride and calcium chloride
Show answer & explanation

Answer: A) Ammonium chloride and zinc chloride

Q67. Which of the following is marked on commonly used fluorescent tube lights?

  1. A220 K
  2. B273 K
  3. C6500 K
  4. D9000 K
Show answer & explanation

Answer: C) 6500 K

Q68. When two or more resistances are connected in series with each other, they are connected in _______.

  1. Ain order of rank
  2. Bin parallel order
  3. Cstraight
  4. Din line
Show answer & explanation

Answer: A) in order of rank

Q69. Which metal is used to generate electricity?

  1. AUranium
  2. Baluminium
  3. Ccopper
  4. DIron
Show answer & explanation

Answer: A) Uranium

Q70. Mica is -

  1. Abad conductor of both heat and electricity
  2. Bconductor of both heat and electricity
  3. Cbad conductor of heat and conductor of electricity
  4. Dconductor of heat and bad conductor of electricity
Show answer & explanation

Answer: A) bad conductor of both heat and electricity

Q71. Which law of physics states that when the distance between two electric charges is doubled, the force between them reduces to one-fourth of its original value?

  1. ACoulomb's law
  2. BPascal's law
  3. CStefan's law
  4. DHooke's law
Show answer & explanation

Answer: A) Coulomb's law

Q72. Ampere is the unit of measurement of what?

  1. Avoltage
  2. Belectric current
  3. Cresistance
  4. DPower
Show answer & explanation

Answer: B) electric current

Q73. What is the source of electrical energy in an artificial satellite?

  1. AThermopile
  2. BSolar Cell
  3. Csmall nuclear reactor
  4. DDynamo
Show answer & explanation

Answer: B) Solar Cell

Q74. The device for converting electrical energy into mechanical energy is-

  1. ADynamo
  2. Btransformer
  3. Celectric motor
  4. DInductor
Show answer & explanation

Answer: C) electric motor

Q75. The conversion of chemical energy into electrical energy is as follows:

  1. Aby electrolysis
  2. Bby photosynthesis
  3. Cby respiration
  4. Dby perspiration
Show answer & explanation

Answer: A) by electrolysis

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