MTSS CLASS - 12 QUIZ

Identity matrix is

• each entry of first column are 1 only

• each entry of first row are 1 only

• all elements of principal diagonal are 1 and other elements are 0

• all elements of principal diagonal are 0 and other elements are 1

• 9

• 6561

• 81

• 3

If sec x - tan x = x, then sec x + tan x =

• x

• x + 1

• 1/x

• x + 1/x

100 cards are numbered from 1, 2, 3, .......... up to 100. A card is drawn at random. The probability that number obtained is a square number is

• 1/5

• 2/5

• 4/5

• 1/10

The foci of the hyperbola 9x2 - 16y2 = 144 are

• ono-one but not onto

• onto but not one-one

• one-one and onto

• nither one-one nor onto

If x =t², y=t³, then d²y/dx² =

• 1. 3/2

• 1. 3/4t

• 1. 3/4t

• 1. 3t/2

If y = ax²+b, then dy/dx at x = 2 is equal to

• 2a

• 3a

• 4a

• none of these