Discrete Mathematics Mock Test 3

10%

Question 1 of 10

1. All the diagonal elements of a skew-symmetric matrix is?

Any integer

Question 1 of 10

Question 2 of 10

2. If A is a subset of B then _______

The cardinality of A is greater than B

None of the mentioned

The cardinality of B is greater than A

Can't say

Question 2 of 10

Question 3 of 10

3. A series can either be AP only or GP only or HP only but not all at the same time.

False

True

Question 3 of 10

Question 4 of 10

4. If for some number a and d, if first term is ¹⁄_a, second term is 1/(a+d), thrid term is 1/(a+2d) and so on, then 5^th term of the sequence is?

none of the mentioned

a+4d

a-4d

1/(a+4d)

Question 4 of 10

Question 5 of 10

5. Which of the following sequeces in AP will have common difference 3, where n is an Integer?

a_n = 2n² + 3n

a_n = 3n² + 3n

a_n = 2n² + 3

a_n = 5 + 3n

Question 5 of 10

Question 6 of 10

6. Which of the following sequeces in GP will have common ratio 3, where n is an Integer?

g_n = 6(3^n-1)

g_n = 3n² + 3n

g_n = 2n² + 3

g_n = 2n² + 3n

Question 6 of 10

Question 7 of 10

7. f(x) is a bijection than f ^-1(x) is a mirror image of f(x) around y = x.

False

True

Question 7 of 10

Question 8 of 10

8. For a skew symmetric even ordered matrix A of integers, which of the following will not hold true?

det(A) = 81

det(A) = 7

det(A) = 9

det(A) = 4

Question 8 of 10

Question 9 of 10

9. Let A order(axb) and Border(cxd) be two matrices, then if AB exists, the order of AB is?

axb

bxc

cxd

axd

Question 9 of 10

Question 10 of 10

10. A square matrix A = [a_ij ]_nxn, if a_ij = 0 for i > j then that matrix is known as _______

Unit matrix

Lower triangular matrix

Upper triangular matrix

Null matrix

Question 10 of 10