XI - MATHS | ONE MARK TEST - 4

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XI - MATHS | ONE MARK TEST - 4 | VOLUME - 2

SHUFFLED ONE MARK (VOLUME - 2)

NAME : *

1. If A and B are symmetric matrices of order n, where

(A ≠ B), then

1 point

(1) A + B is skew-symmetric

(2) A + B is symmetric

(3) A + B is a diagonal matrix

(4) A + B is a zero matrix

2.If A and B are two matrices such that A + B and AB are both defined, then
*

1 point

(1) A and B are two matrices not necessarily of same order

(2) A and B are square matrices of same order

(3) Number of columns of A is equal to the number of rows of B

(4) A = B.

3. *

1 point

(1) 3

(2) 1/3

(3) 6

(4) 1/6

4. *

1 point

(1) an identity matrix of order n

(2) an identity matrix of order 1

(3) a zero matrix of order 1

(4) an identity matrix of order 2

5. *

1 point

(1) 3

(2) 2

(3) 1

(4) 4

6. *

1 point

(1) both positive integers

(2) both negative integers

(3) both irrational

(4) one rational and another irrational

7. Four persons are selected at random from a group of 3 men, 2 women and 4 children. The probability that exactly two of them are children is *

1 point

(1) 3/4

(2) 10/23

(3) 1/2

(4) 10/21

8.If two events A and B are independent such that P(A) = 0.35 and P(A ∪ B) = 0.6, then P(B) is
*

1 point

(1) 5/13

(2) 1/13

(3) 4/13

(4) 7/13

9.There are three events A, B and C of which one and only one can happen. If the odds are 7 to 4 against A and 5 to 3 against B, then odds against C is
*

1 point

(1) 23:65

(2) 65: 23

(3) 23: 88

(4) 88: 23

10. *

1 point

(1) 1

(2) 0

(3) ∞

(4) −∞

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