# IIT JEE / PMT Module Test 3 : +2 Mathematics : Matrices n Determinants

18

512

81

none of these

Normal type of MCQ with one correct option A square matrix A is called idempotent if

A2 = I

A2 = O

2A = I

A2 = A

an invertible matrix

an idempotent matrix

a nilpotent matrix

none of these

Normal type of MCQ with one correct option If A and B are symmetric matrices of the same order, then

AB is symmetric matrix

A(B is a skew-symmetric matrix

AB + BA is a symmetric matrix

AB ( BA is a symmetric matrix

/

A,B

B

C,D

A,B & D

(a2+b2c2)

(ab+bc+ac)

a2+b2 - c2

(a-c)(b-c).

/

A

B

C

A+B+C

2

-2

4

-4

Both A and R are true and R is correct explanation of A

Both A and R are true and R is not correct explanation of A

A is true, R is false

A is false, R is true

**Description:**

Brilliant Institute of Advance Studies, Chandigarh offers a complete test series for IIT JEE and PMT preparation for FREE at WiZiQ.com. This series constitutes 11 modules of each subjects +1 and +2 of all subjects Physics, Chemistry, Mathematics and Biology. The pattern of each test comprises all the types of objective questions of IIT JEE and AIPMT (MCQ with one or more correct option, Comprehension, Assertion-Reason, Match Matrix etc). This is the FREE Module test 3 of +2 Mathematics; the covered chapter is Matrices n Determinants. Keep checking for Exclusive Paid Test series for IIT JEE and AIPMT from us at a very nominal cost at WiZiQ.com Happy Learning; all the best!

**Discussion**

I did not understand how it done........... Plz explain???????

1196 days 21 hours 48 minutes ago

idempotent law is used in chapters like logic,boolean algebra.for multiplacation of nambers

1331 days 21 hours 46 minutes ago

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