When cathode rays are focused on thin metal foil, it gets heated up to ……………

When a metal is heated, its resistance

On uniform heating, the side of a square sheet of metal is increasing at the rate of 0.02 cm/sec. The rate at which the area is increasing when the side is 10 cm long is :

Give equations for the reactions that occur when Magnesium metal is heated in air.

X is a reddish - brown metal used in electrical wires. When the same metal in powdered form is heated strongly, it turns black. When hydrogen gas is passed over this black substance it regains its original colour. The metal X is

What happens when sodium metal is heated in air?Give equation.

During extraction of metals, electrolytic refining is used to obtain pure metals. a. Which material used as cathode and anode for refining of silver metal by this process? b. Suggest a suitable electrolyte. c. In this electrolytic cell where do we get pure silver after electricity is passed?

What do you observe in the surroundings in terms of cooling or heating when water vapour is getting condensed (AS_1)

Two metal rods made up of iron (K_1=79Wm^(-1)K^(-1)) and brass (K_2=109Wm^(-1)K^(-1)) are of identical shape and size. These are fused at the junction. If the temperature at the free end of iron is at a steam point and brass at ice point then calculate the temperature at the junction, when the steady state is attained.