Olympiad – Class VIII – Science - Phy - Chemical Effects of Electric Current

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Question - 1

What is current?

  • A The flow of matter
  • B The flow of electrons
  • C The flow of protons
  • D The flow of charge

Question - 2

In electrolytic solutions, which of the following acts as carrier of charge?

  • A Protons
  • B Electron
  • C Neutrons
  • D Ions

Question - 3

What are insulators?

  • A Materials that conduct electricity
  • B Materials that do not conduct electricity
  • C Materials that conduct electricity only at low temperature
  • D Materials that conduct electricity at room temperature

Question - 4

Which of the following is an insulator?

  • A Wood
  • B Iron
  • C Graphite
  • D Silver

Question - 5

Which of the following circuits gives the correct way of connecting an LED to light it up?

  • A
  • B
  • C
  • D

Question - 6

Which of the following energy conversions takes place in a cell?

  • A Electrical energy into chemical energy
  • B Chemical energy into electrical energy
  • C Magnetic energy into electrical energy
  • D Electrical energy into mechanical energy

Question - 7

Which of the following are the characteristics of an electrolyte

  • A It has a positive charge
  • B It has a negative charge
  • C It conducts charge without dissociating.
  • D It forms positive and negative ions

Question - 8

Which acid is present in lemon juice that acts as an electrolyte?

  • A Sulphuric acid
  • B Nitric acid
  • C Hydrochloric acid
  • D Citric acid

Question - 9

Which of the following is the electrolyte in a dry cell?

  • A Copper sulphate
  • B Zinc sulphate
  • C Sulphuric acid
  • D Ammonium chloride

Question - 10

In a dry cell, which of the following acts as the positive terminal?

  • A Carbon rod
  • B Manganese dioxide
  • C Manganese dioxide and powdered carbon
  • D  A metal cap on the carbon rod