Discrete Mathematics MCQs for jobs test and examination

**1. A function from B to A is called onto function if its range is:**

A. B

B. A

C. Neither A nor B

D. both A and B

**2. If p= It is raining q = She will go to college**

“It is raining and she will not go to college” will be denoted by:

A. p ˄ q

B. q ˄ ˷p

C. q ˄ p

D None of these

**3. A subset f of B x A is said to be a function from B to A if the domain of f is B and **the first** element of order pairs of f:**

A. does not repeat

B. does not exist

D. members of A

**4. The negation of “Today is Monday” is:**

A. Today is Saturday

B. Today is Wednesday

C. Today is Monday

D. Today is not Monday

**5. A function in which the second element of order pair is distinct is called:**

A. onto function

B. one-one function

C. identity function

D. inverse function

**6. The converse of the conditional statement q —> p is:**

A. p —> q

B. p —> ˷q

C. ˷p —> q

D. None of the above

**7. Letters of SAP taken all at a time can be written in:**

A. 2 ways

B. 6 ways

C. 24 ways

D. 120 ways

**8. Contra-positive of the given statement “If two angles are congruent, then they have the same measure” is:**

A. If two angles are congruent, then they have not the same measure

B. If two angles are not congruent, then they have the same measure

C. If two angles do not have the same measure, then they are not congruent

D. None of these

**9**. **A student has a maximum of 720 words from a combination of letters of a word given word is:**

A. CANADA

B. ENGLAND

C. WASHINGTON

D. None the above

**10. The statement “It is not raining if and only if roads are dry” is logically equivalent to:**

A. If roads are dry then it is not raining

B. If it is not raining then roads are dry

C. Roads are dry if and only if it is not raining

D. none of these

**11. The inverse of this statement If p, then q is:**

A. If not p, then not q

B. if p, then not q

C. if not p, then q

D. none of the above

**12. A converse of this statement If p, then q is:**

B. if not q, then p

C. If q, then p

D. None of these