Question

1. consider the following material : copper, tungsten, chromium, aluminium, nichrome, iron which of these is used to make a) heating element? b) filament of an electric bulb? 2. explain why, any metal wire or metal strip cannot be used in place of fuse wire 3. when does an electric short circuit occur? 4. what is a rainbow? how it is produced? what information you get from sunlight of the rainbow? 5. in what way is the word ambulance painted in form of the hospital vans? why is it painted this way? 6. which of the following are acidic and which are basic? lime water, vinegar, toothpaste, stomach juices, lemon juice, baking soda solution, milk of magnesia, ammonia solution 7. state whether distilled water is acidic, basic or neutral. how will you confirm it? 8. what do you mean by aerobic and anaerobic respiration? give two differences with examples. 9. describe the process of respiration: a) in the leaves of plant b) in the roots of plant 10. why do mountaineers carry oxygen gas cylinders with them?

Answer 1

Explanation:

Answer

Amongst iron, silver, nichrome, tungsten, copper, which metal / alloy should be used to make the (i) Heating element of electric geysers (ii) Filament of incandescent bulbs. An electric iron has rating of 750W, 220 V.

Answer 2

Answer:

Explanation:

i have already ans these question hence i have taken screen short