Class VII

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
When an electric current passes through a solenoid, it acts as a/an 
  1. insulator 
  2. electric bell 
  3. electric bell 
  4. bar magnet 
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 
The device used to make or break an electric circuit is:
  1. Resistor
  2. Battery
  3. Switch
  4. Ammeter
Which of the following is the best option while considering the safety of household electric appliances?
  1. We should use wire strip as fuses.
  2. We should use non-ISI marked MCBs
  3. We should use ISI marked MCBs
  4. We should use conductors with high melting point in fuses.
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