Class VII

Which of the following is an essential element in an electric circuit?
  1. switch
  2. connecting wires
  3. voltmeter
  4. ammeter
The magnetic effect of the current was discovered by ________?
  1. Newton
  2. Joule
  3. Oersted
  4. Ohm
The unit to measure electric resistance is:
  1. Joule
  2. Ohm
  3. Ampere
  4. Volt
The strength of the magnetic field due to a solenoid can be increased by
  1. decreasing the current strength in the solenoid
  2. increasing the number of turns in the solenoid
  3. by winding solenoid around a plastic rod
  4. all of the above
Which of the following does not use magnetic effect of electric current?
  1. electric fan
  2. electric bulb
  3. electric motor
  4. refrigerator
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