Question

UNIT 6: Purity of Gold

Read the following conversation between Shubhi and her mother and then answer the questions

given below:

Shubhi: Mother, what are you gifting me on my birthday?

Mother: Dear, I will buy for you a beautiful pair of gold earrings.

Shubhi: Wow! Mother I am eagerly waiting for them. Let’s go shopping right now.

Shubhi and her mother visit the nearby jewellery shop.




Shubhi: Mother, what do you mean by 24 ct Gold?

Mother: Gold is alloyed because in it's purest form, it's too soft for making jewellery. It can

easily be bent with bare hands, or get scratched or marred.

An alloy is any mix of metal with other metals, used to give the material certain desired

properties, like: increased hardness, variations incolor, lower melting points, higher melting

points, or even lower price.

Gold purity content is categorized using the carat system. Depending on the ratio of pure gold to

other alloys, the gold used in rings and other jewellery is usually categorized as 10k, 14k, 18k,

22k and 24k.We use K or ct or sometimes kt for carat.

The higher the carat, the purer the gold. 24k gold is also called pure gold or 100 per cent gold.

This means that all 24 parts in this type of gold are all pure without traces of any other metals.

22K gold means there are 22 parts of gold and 2 parts of other metals.

Question 17: Shubhi draws a table to calculate the purity of different types of gold, choose the

correct values of x and y:

Carat

Parts of gold

Purity in %

24 k

24/24

99.9%

22k

22/24

X

18 k

y/24

75

a) x= 99.9 %and y = 20

b) x= 95% and y = 20

c) x = 91.7% and y=18

d) x= 86% and y= 18

Question 18: The cost of 5 gm of gold earring was Rs.22,000/-. The shopkeeper charged making

charges @ Rs 1000 per gm of gold. Also, a GST of 18% was charged. What is the total amount

that Shubhi has to pay?

a) Rs.27,000

b) Rs 31,860

c) Rs 29,000

d) Rs.34,220

Question 19: The shopkeeper apprised Shubhi about the special schemes of 5 % discount available

if she pays through card. If Shubhi pays by card then what is the amount that she will be charged?

a) Rs. 30267

b) Rs. 30367

c) Rs. 30000

d) Rs. 31000
​

Answer 1

Answer:

1. answer is (C)

2.answer(D)

3.answer (A)

Answer 2

31860

Step-by-step explanation:

gold - 5 gm

price - 22000

making charge - 1000×5 = 5000

22000+5000=27000

18% of 27000 = 4860

total 27000+4860 = 31860