Worksheets12 th Maths Choose the correct answer Chapter 11 and 12
Total questions: 10
Worksheet time: 2mins
Subtraction is not a binary operation in
R
Z
Q
N
The operation * defined by a*b= 7ab is not a binary operation on
Q+
C
Z
R
If a*b= a2+b2 on the real numbers then * is
commutative but not associative
both commutative and associative
associative but not commutative
neither commutative nor associative
Which one of the following statements has the truth value T?
5 Is an irrational number
sin x is an even function
Every square matrix is non-singular
The product of complex number and its conjugate is purely imaginary
If a compound statement involves 3 simple statements, then the number of rows in the truth table is
3
9
6
8
A
pair of dice numbered 1,2,3,4,5,6 of a six-sided die and 1,2,3,4 of a
four-sided die is rolled and the sum is determined. Let the random variable X
denote this sum. Then the number of elements in the inverse image of 7 is
1
4
2
3
1. A random variable X has binomial distribution with n = 25 and p=0.8 then standard deviation of X is
6
2
3
4
1. On a multiple-choice exam with 3 possible destructives for each of the 5 questions, the probability that a student will get 4 or more correct answers just by guessing is
2431
2435
83
24311
If p∨q is false (F),then
p is false
q is false
p and q are false
p or q is false
The value of E(1)=
1
0
∞
−∞
