Question

1.Give an example of a metal which

a) can be easily cut with a knife.

b) is the best conductor of heat.

2. Write the equations for the reaction of iron with steam.

3. What would you observe when zinc is added to a solution of iron(II) sulphate?

4. Why do ionic compounds have high melting points?

5. What are amphoteric oxides?

6. An element reacts with oxygen to give a compound with a high melting point.

This compound is also soluble in water.the element is likely to be_________.

7. What is meant by saying that the potential difference between two points is

1V?

8. Will current flow more easily through a thick wire or a thin wire of the same

material, when connected to the same source? Why?
9. An electric bulb is rated 220V and 100W. When it is operated on 110V, the

power consumed will be________.

10. A piece of wire of resistance R is cut into five equal parts. These parts are

then connected in parallel. If the equivalent resistance of this combination is

R’, then the ratio of R/R’ is ___________.

11. A positively charged particle (alpha particle) projected towards west is

deflected towards north by a magnetic field. The direction of magnetic field is

___________.

12. Give two reasons why is vegetative propagation practised for growing some

plants.

13. How does binary fission differ from multiple fission.

14. How will an organism be benefited if it reproduces through spores?

15. Give two examples of bisexual flowers.

16. What is the role of decomposers in the ecosystem?

17. Write an example of food chain.

18. Give an proper environmental-friendly practices.

19. What will happen if we kill all the organisms in one trophic level?

20. Write two biodegradable items.

​

Answer 1

Answer:

first questions answer

Explanation:

a) metal which can be easily cut with the knife is sodium.

b) copper and aluminium.

i can't answer all so i gave only first question's answer ok hope it helps you.

but don't forget to give thanks ok.