CBSE Class 10 Sample Paper Science Solution - For 2024 Boards

Question 1

Question 2 Important

Question 3

Question 4

Question 5 Important

Question 6

Question 7 You are here

Question 8 Important

Question 9

Question 10 Important

Question 11

Question 12

Question 13 Important

Question 14 Important

Question 15

Question 16 Important

Question 17 [Assertion Reasoning] Important

Question 18 [Assertion Reasoning]

Question 19 [Assertion Reasoning]

Question 20 [Assertion Reasoning] Important

Question 21

Question 22 Important

Question 23 (Choice 1) Important

Question 23 (Choice 2)

Question 24

Question 25 (Choice 1)

Question 25 (Choice 2) Important

Question 26

Question 27 Important

Question 28 (Choice 1) Important

Question 28 (Choice 2)

Question 29 Important

Question 30

Question 31 (i) Important

Question 31 (ii)

Question 31 (iii) Important

Question 32 (i)

Question 32 (ii) Important

Question 33 Important

Question 34 (Choice 1A)

Question 34 (Choice 1B) Important

Question 34 (Choice 2)

Question 35 (Choice 1)

Question 35 (Choice 2A) Important

Question 35 (Choice 2B)

Question 36 (Choice 1) Important

Question 36 (Choice 2) Important

Question 37 (a) [Case Based]

Question 37 (b) - Choice 1 [Case Based] Important

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

Question 38 (a) [Case Based] Important

Question 38 (b) [Case Based]

Question 38 (c) - Choice 1 [Case Based] Important

Question 38 (c) - Choice 2 [Case Based]

Question 39 (a) [Case Based]

Question 39 (b) [Case Based] Important

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

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

An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is:

(a) 10

(b) 12

(c) 14

(d) 18

 

Answer:

(c) The maximum number of electrons that can be filled in the second shell = 8

Since shell 3 has 50% of electrons present in shell 2, 

Number of electrons in shell 3 = 50/100 of 8 = 4

Shell can have a maximum of 2 electrons.

So, the electronic configuration of the element= 2,8,4

Atomic number = 2+8+4 = 14

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo