Chapter 12: Discrete Mathematics - Online Test
Q1. A binary operation on a set S is a function from
Answer : Option B
Explaination / Solution:
No Explaination.
Q2. Subtraction is not a binary operation in
Answer : Option C
Explaination / Solution:
Q3. Which one of the following is a binary operation
on ℕ?
Answer : Option B
Explaination / Solution:
No Explaination.
Q4. In the set ℝ of real numbers ‘ * ’ is defined as follows. Which one of the
following is not a binary operation on ℝ ?
Answer : Option D
Explaination / Solution:
Q5. The operation * defined by a
∗ b = ab/7
is not a binary operation on
Answer : Option B
Explaination / Solution:
Q6. In the set ℚ define a 
b = a +b +ab . For what value of y, 3 ( y 5)= 7 ?
b = a +b +ab . For what value of y, 3 ( y 5)= 7 ?
Answer : Option B
Explaination / Solution:
Q7. If a ∗ b = √(a2
+b2) on the real numbers then * is
Answer : Option C
Explaination / Solution:
Q8. Which one of the following statements has the
truth valueT ?
Answer : Option D
Explaination / Solution:
No Explaination.
Q9. Which one of the following statements has truth
value F ?
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. If a compound statement involves 3 simple
statements, then the number of rows in the truth table is
Answer : Option B
Explaination / Solution:
