P-2 Environmental management — Science STD 10 — Question

Calculate the heat produced in calorie when a current of 0.2 A is passed through a wire of resistance 41.8 Ω for 10 minutes.

What happens when a piece of zinc metal is added to copper sulphate solution?

Write balanced chemical equation with state symbols for the following reaction:
Barium chloride solution reacts with sodium sulphate solution to give insoluble barium sulphate and a solution of sodium chloride.

A communications satellite in orbit sends a parallel beam of signals down to earth. If these signals obey the same laws of reflection as light and are to be focussed onto a small receiving aerial, what should be the best shape of the metal 'dish' used to collect them?

Draw a circuit diagram to show how 3 bulbs can be lit from a battery so that 2 bulbs are controlled by the same switch while the third bulb has its own switch.

In a solar water heater, why is the storage tank placed at a higher lever than the solar panel containing coils?

Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?

Which of the above elements have the biggest and the smallest atom?