Class VII

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.
We should use conductors with high melting point in fuses.
  1. We should use conductors with high melting point in fuses.
  2. CFLs can be fixed in the ordinary bulb holders.
  3. both (a) and (b)
  4. none of the above
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 device used to make or break an electric circuit is:
  1. Resistor
  2. Battery
  3. Switch
  4. Ammeter
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