Olympiad – Class VI – Science - Phy - Electricity & Circuits

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Question - 1

If we touch a live wire carrying current, we get a shock. This is because our body is a/an

  • A conductor of electricity.
  • B insulator of electricity.
  • C source of electricity
  • D both (B) and (C).

Question - 2

Which of the following statements is true?

  • A Electricity can be created.
  • B Electricity flows in a circuit with gaps
  • C A cell converts chemical energy to electrical energy
  • D A cell consists of three terminals.

Question - 3

Most of the electricity-carrying wires along the roads do not have a plastic covering like the wires used at homes. But why is there no substantial loss of energy?

  • A Air is not affected by gravity.
  • B Air is a bad conductor of electricity.
  • C Electricity flows very fast near highways.
  • D Current rating is high near highways

Question - 4

What is the filament of an electric bulb usually made up of?

  • A A thin wire with many coils
  • B A thick wire with many coils
  • C A thin straight wire
  • D A thick straight wire

Question - 5

Electric heaters used for cooking have a filament or a heating coil placed on a plate made up of clay. Why is this so?
(i) It is a bad conductor of heat.
(ii) It is a bad conductor of electricity.
(iii) It is porous.

  • A Only (i) and (ii)
  • B Only (ii) and (iii)
  • C Only (i) and (iii)
  • D (i), (ii) and (iii)

Question - 6

Why are the electric wires used in homes usually covered with materials like plastic or rubber?

  • A To prevent rusting
  • B To make handling easier
  • C To prevent shock and short circuits
  • D To make them look beautiful

Question - 7

Why is a switch used in a circuit?

  • A To save energy
  • B To complete or break a circuit
  • C To prevent electric shocks
  • D To make the bulb glow easily

Question - 8

Which of the following does NOT conduct electricity?

  • A Aluminium
  • B Salt solution
  • C Ceramic articles
  • D Silver

Question - 9

Which of the following energy conversions take place in a torch?

  • A Electrical⟶chemical⟶light
  • B Chemical⟶electrical⟶light
  • C Electrical⟶light⟶chemical
  • D Light⟶chemical⟶electrical

Question - 10

Why is tungsten used as a filament in electric bulbs?

  • A It is non-luminous.
  • B It is a soft metal
  • C It has a high melting point
  • D It has a low melting point.