CBSE  /  Class 7  /  Science  /  Electric Current and Its Effects

  • 1. 
    In making a battery

  • positive terminal of one cell is connected to the negative terminal of the next cell
  • positive terminal of one cell is connected to the positive terminal of the next cell
  • negative terminal of one cell is connected to the negative terminal of the next cell
  • none of the above

  • 2. 
    Where can the key or switch be placed in the circuit?

  • Left side of the battery
  • Right side of the battery
  • Can be placed anywhere in the circuit
  • Near the positive terminal of the bulb

  • 3. 
    Which one of the following is based on the heating effect of current?

  • Geyser
  • Hair dryer
  • Immersion rod
  • All of these

  • 4. 
    The coil of wire contained in an electric heater is known as

  • component
  • element
  • circuit
  • spring

  • 5. 
    The amount of heat produced in a wire depends on

  • material
  • length
  • thickness
  • all of these

  • 6. 
    Which mark is necessary on electric appliances?

  • AGMARK
  • ISI
  • FICCI
  • KSK

  • 7. 
    When an electric current flows through a copper wire AB as shown in Figure, the wire

  • deflects a magnetic needle placed near it
  • becomes red hot
  • gives electric shock
  • behaves like a fuse

  • 8. 
    Choose the statement which is not correct in the case of an electric fuse.

  • Fuses are inserted in electric circuits of all buildings.
  • There is a maximum limit on the current which can safely flow through the electric circuits.
  • There is a minimum limit on the current which can safely flow in the electric circuits.
  • If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit.

  • 9. 
    Which of the following precautions need not be taken while using electric gadgets / appliances/circuit?

  • We should never touch a lighted electric bulb connected to the mains.
  • We should never experiment with the electric supply from the mains or a generator or an inverter.
  • We should never use just any wire or strip of metal in place of a fuse.
  • We should never turn the switch in ON position.
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