Class VII

Which of the following is an essential element in an electric circuit ? 
  1. switch 
  2. connecting wires 
  3. voltmeter 
  4. ammeter 
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
Compact fluorescent lamps (CELs) are considered better than ordinary electric bulbs because ? 
  1. CFLs reduce wastage 
  2. CFLs can be fixed in the ordinary bulb holders . 
  3. both (a) and (b) 
  4. none of the above 
Which of the following acts as safety device in electric appliances ? 
  1. fuse 
  2. connecting wires 
  3. resistors 
  4. battery 
The device used to make or break an electric circuit is : 
  1. Resistor 
  2. Battery 
  3. Switch 
  4. Ammeter 
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