A: earth pin
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The diagram shows a circuit. What is the reading on the ammeter when the switch is open, and the reading when it is c…
The diagram shows a circuit. The lamp is a 12W lamp and is working at normal brightness. What are the readings on the…
A lamp rated 6 V, 2A is switched on for 60 s. How much energy is used?
A radioactive nuclide ²³⁸₉₂U decays into thorium by emitting an alpha-particle. The thorium then decays into protacti…
Chlorine exists as two isotopes. One has a nucleon number (mass number) of 35 and the other has a nucleon number (mas…
A manufacturer measures accurately the dimensions of a wooden floor tile. The approximate dimensions of the tile are …