Gold is a very precious metal. Pure gold is very soft and is thus not suitable for making jewellery. It is alloyed with either silver or copper to make it hard. But some jewellers mix a large quantity of copper and silver in gold to earn more profit.(a)What precautions should you take while purchasing gold jewellery?(b)What standard you must see on gold ornaments? (c)What value of shopkeeper’s are shown here?
Answers
Explanation:
Q.5 Which soil has the largest water holding capacity? (1)
Q.6 Why should oils and fats be not released in the drain?
Explain. (2)
Q.7 (a) What is lateral inversion? (1)
(b)What is soil profile? Name the different horizons. (1)
Q.8 (a) What is sludge? Explain how it is treated. (2)
(b) What is reflection of light? (1)
Q.9 (a)Write the difference between concave and convex lens.
(2)
(b) What is cleaning of water? (1)
Q.10 (a)List the difference between clayey soil and sandy
soil. (2)
(b) What are the better housekeeping practices? (2)
(c)Sketch the cross section of soil and label the various
layers. (1)
Answer:
(i) We should always purchase the gold jewellery from a , branded shop with proper receipt and hallmark certificate.
(ii) Government insists on purchasing hallmarked jewellery as it contains the gold and its alloyed metal, (i.e. copper or silver) in a fixed ratio.
(iii) The value associated with the given passage is that the consumers should be more careful and aware and thus, cannot be fooled easily while shopping jewellery and other products.