Mathematics 9 Unit 1

Unit 1:

Q.1 Choice the correct option (A,B,C,D) ?

1. A matrix is skwe-symmetric if:

(a) At = A        (b) At = -A            (c) (At)t = A           (d) (At)t = -A

2. Negative of matrix is:

(a)               (b)           (c)           (d)

3. Order of identity (unit) matrix is always equal to:

(a) Square matrix

(b) Rectangular matrix

(c) Row matrix

(d) Null matrix

4. Addition of two matrices + is:

(a)            (b)           (c)             (d)

5. Product of is:

(a)           (b)            (c)            (d)

6. Adjoint of is:

(a)          (b)             (c)            (d)

7. If =3, then x is equal to:

(a) 2        (b) 5         (c) 1          (d) 0

8. (AB)-1 =……………………

(a) A-1B-1

(b) B-1A-1

(c) AB

(d) BA

9. (AB)t =………………………

(a) AtBt        (b) BtAt         (c) AB         (d) BA

10. If x + = , then x is equal to:

(a)         (b)           (c)            (d)

Q. 2 (Short Questions)

1.Define matrix.

2.Define column matrix.

3.What is meant by diagonal matrix?

4.Show that, matrix is a singular matrix.

5.Find the multiplicative inverse if B =

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