Question

of approximately 3 m from him. Name the defect of vision the boy is suffering to
possible causes of this defect and explain the method of correcting it.
(b) Why do stars twinkle ? Explain.
OR
(a) Write the function of each of the following parts of human eye:
(i) Cornea
(ii) Iris
(iii) Crystalline lens
(iv) Ciliary muscles
(b) Why does the sun appear reddish early in the morning ? Will this phenomenon
an astronaut on the Moon ? Give reason to justify your answer.
21. (a) State Fleming's left hand rule.
(b) Write the principle of working of an electric motor
(c) Explain the function of the following parts of an electric motor:
(i) Armature
(ii) Brushes
iii) Split ring
SECTION-B
Answer all questions
22. A student added few pieces of aluminium metal to two test tubes A and B containin
of iron sulphate and copper sulphate. In the second part of her experiment, she
another test tubes C and D containing aqueous solutions of aluminium sulphate a
In which test tube or test tubes will she observe colour change? On the basis oft
which one is the most reactive metal and why?​

Answer 1

Answer:

b

Explanation:

a,i hope it will help you