Olympiad – Class VII – Science - Phy - Electric Current and Its Effects

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Question - 1

Which symbol of the component is represented here?

  • A Switch in the 'ON' position
  • B Switch in the 'OFF' position
  • C Circuit breaker
  • D Battery

Question - 2

The symbol of a cell is given as   What does the shorter, thicker vertical line in the symbol of a cell represent?

  • A The positive terminal
  • B The negative terminal
  • C The direction of current
  • D All of the above

Question - 3

Which appliance does not use an electromagnet?

  • A T.V.
  • B Electric Bell
  • C Radio
  • D Electric Heater

Question - 4

Which of the following is an electrical conductor?

  • A Silver
  • B Cork
  • C Silver-coloured plastic
  • D Wood

Question - 5

Which of the following materials allows electricity to pass through it?

  • A Conductor
  • B Insulator
  • C Rubber
  • D Glass

Question - 6

Which of the following is an electrical insulator?

  • A Aluminium
  • B Cork
  • C Gold
  • D Copper

Question - 7

Identify the element that is used for making the filament in bulbs

  • A Tungsten
  • B Copper
  • C Aluminium
  • D Silver

Question - 8

In which of the following circuits will the bulb or the bulbs glow the brightest?

  • A A simple circuit with one bulb and one cell
  • B A simple circuit with one bulb and two cells
  • C A simple circuit with two bulbs and one cell
  • D A simple circuit with two bulbs and two cells

Question - 9

Why is electrical wiring usually covered with a layer of plastic?

  • A To make it strong
  • B To allow electricity to flow in it
  • C To make it safe
  • D To make it beautiful

Question - 10

Why does the bulb glow brighter when it is powered by two cells rather than one?

  • A The flow of electricity in the circuit is less.
  • B The flow of electricity in the circuit is the same
  • C The flow of electricity in the circuit is greater
  • D The flow of electricity fluctuates