Question

1.Complete the analogy
primary cell : _____________ :: secondary cell :
a.storage cell
b.irreversible
c.accumulators
d.none of the above


2.There are some materials such as iron nails, silver and gold ornaments, which loose their lustre when exposed to air. Why does this happen?
(i) all materials are made of metals
(ii) these are not made of pure substances
(iii) they react with oxygen /sulphur/moisture and a layer is formed over them
(iv) both (i) & (iii)

3. People who suffer from ____ may have too much sugar in their blood.
a.diabetes
b.high blood pressure
c.obesity
d.rickets

4. If we connect two terminals of an electric cell directly without connecting them through a switch and a device like bulb, then
a.the chemicals inside it will get used up very fast
b.the chemicals inside it will not get used up very fast
c.the two terminals of the electric cell will get used up very fast
d.the two terminals of the electric cell will not get used up very fast


5.Which of the following energy conversions take place in a torch?
a.electrical → chemical → light
b.chemical → electrical → light
c.electrical →light → chemical
d.light →chemical → electrical

Answer 1

Answer:

1)storage cell

2)they react with oxygen /sulphur/moisture and a layer is formed over them

3).high blood pressure

4)the two terminals of the electric cell will not get used up very fast

5)electrical →light → chemical