Question

(ili) Principal focus (concave lens)
SECTION -D
• Answer the questions in detail. (4 marks each)
[20]
(35)(a) Explain why is hydrochloric acid a strong acid and acetic acid a weak acid?
(b) Explain why aqueous solution of an acid conducts electricity.
(c) You have four solutions A, B, C and D. the pH of solution A is 6, B is 9, C is 12 and D is 7:
(i) Identify the most acidic and most basic solutions
(II) Arrange the above four solutions in increasing orders of He concentration.
(36) Write a note on refining of metals.
OR
(36) 1) Differentiate between roasting and calcination
ii) Two metals which are alloyed with iron to make stainless steel.
iii) Two metals which are used to make jewellery.
(37) Explain the process of digestion in human beings.
(38) 1) Write the laws of refraction.
ii) Explain the term absolute refractive index.
iii) What is the unit of refractive index?
OR
(38) i) Which three main rays are used to locate the image formed by a
spherical lens? Explain by drawing diagram.
ii) What is lens formula? State the lens formula for a thin lens with small aperture.
(39) Write an activity to show the refraction of light through a prism.​

Answer 1

Answer:

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