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Matrices and Determinants CBSE Class 12 Math Board Exam 2023 Important Questions

by Anwesha Bose
March 3, 2023
in 12th Class, Career Guide
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These two chapters (3 and 4) have a collective weightage of 13 marks. There will be one 6-mark question, one 4-mark question and few 1-mark questions.

Your target time for first revision should be 9-10 hours appx for the three exercises (3.1 to 3.4, misc 3, 4.1 to 4.6 & misc 4) and the Misc exercise and also little bit of previous years’ questions from reference book.

Some important questions from NCERT are as follows:

Ex 3.1:Definitions – diagonal matrix, identity matrix
;
Question – 3, 8, 10
Ex 3.2:Examples – 11, 18; Note on page 76;

 

Questions 3(iv), 6, 7(ii), 10, 12, 13, 15, 17, 18, 20, 21, 22

Ex 3.3:Property – 3.5.1(iv); Definition – 4A, 5A; Theorem – 1, 2, Ex 22;

 

Questions – 5(i), 6(i), 7(i), 10(iii), 11, 12

Ex 3.4:Definition – 6; Theorem – 4, Ex 24;

 

Questions – 8, 17

Misc 3:Examples – 26, 27, 28;

 

Questions – 1, 3, 4, 7, 9, 11, 12, 13, 15

Ex 4.1:Property of A = kB in page 107
;
Questions – 4, 8
Ex 4.2:Examples – 11, 12, 14, 15, 16;

 

Questions – 4, 8(i), 10(i), 11(i), 12, 15, 16

Ex 4.3:Questions – 2, 5
Ex 4.4:Note at page 124
Ex 4.5:Theorem 4, Ex 26;

 

Questions – 11, 13, 16, 17, 18

Ex 4.6:Consistent & Inconsistent systems, Ex 28, 29

 

; Questions – 13, 15, 16

Misc 4:Examples 30, 33;

 

Questions – 5, 9, 11, 13, 14, 17, 19

Tips:  

  1. Along with numerical, some theory concepts are also important in this chapter.
  2. Properties of determinants are very important – especially Property 6 (page 114).
  3. In expansion of Determinants, decide well before exam about one style – expansion by row or column.
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