Science MCQs

1 kWh is the energy used by a 1 kW appliance running for 1 hour.

The chemical effect of current breaks down solutions (electrolysis).

An electromagnet only works when current is flowing.

A short circuit provides a very low-resistance path, leading to dangerously high current.

An MCB can be reset after tripping, unlike a fuse which must be replaced.

The earth wire directs dangerous fault current safely into the ground.

Electromagnets in telephone earpieces convert electrical signals into sound waves.

Overloading can cause overheating and fire due to excessive current.

Georg Simon Ohm formulated Ohm's Law.

Water pressure is analogous to electrical voltage (potential difference).