Practice Questions CBSE - Science Class 10 (2023 Boards)

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Question 17 [Assertion Reasoning] Important

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Question 21 (Choice 1) Important

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Question 31 (a)

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Question 34 (a) - Choice 1

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Question 37 (a) - Choice 1 [Case Based] You are here

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Question 37 (b) ii - Choice 2 [Case Based] Important

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Question 39 (c) - Choice 1 [Case Based]

Question 39 (d) - Choice 1 [Case Based] Important

Question 39 (d) - Choice 2 [Case Based] Important

(a) What is the percentage of gold in 18 carat gold? Name any two metals that are used to make 22 carat gold.

(b) Like gold, pure iron is also comparatively soft and also undergoes rusting. Name the substance that is mixed with iron.

(i) to make it hard.

(ii) to change it to stainless steel to prevent rusting.

 

Answer:

(a) Percentage of gold in 18 carat gold = No. of parts of gold/Total no of parts x 100

= 18/24 x 100

= ¾ x 100

= 75% 

Metals generally mixed with gold are: Silver, Copper

(b 1) 

(i) Carbon is mixed with Iron to make it hard . This is known as steel .  

(ii) Nickel and Chromium are used to prevent rusting , which makes the mixture into stainless steel .

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo