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?
Answers
Answer:
Explanation:
a)tungsten
b)tungsten
2;
because they have low melting point and boiling point and low resistance when compared to alloys
3;
it occur when over loading of current through the circuit
4;
rain bow is a natural phenomenon
rain bow are formed by the property of dispersion property of light
5;
these are occured as reversed due to convex mirror
6;
- lime water is basic
- vinegar is acidic
- tooth past are basic
- stomach acid are acidic
- lemon juice are acidic
- baking soda are basic
- milk of magnesia are basic
- ammonia is acidic
7;
when we dip in universal indicator it shows ph 7 these shows neutral in nature
8;
aerobic respiration;o2 is used to break down of food ex;humans ans birds
anarobic respiration;no usage of o2 for breakdown of food ex:unicellular organisms and sometimes in muscle tissue of humans
9;
process by which organism obtain energy is called respiration
a)----aerobic respiration
b) aerobic respiration
10;
at higher allitudes o2 in the atmospere is less hence mountainers carry oxygen cylinders with them
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