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# PSC Vocational Teacher in Computer Science Model Questions and Answers

Last Updated On: 30/04/2018

PSC Vocational Teacher in Computer Science Model Questions and Answers: Here are the model questions and answers for Vocational Teacher in Computer Science PSC examination. These are the previous asked questions for the PSC Vocational Teacher in Computer Science Examination.

## PSC Vocational Teacher in Computer Science Model Questions and Answers

1. gcd(272, 1479) is …………
(A) 17 (B) 7
(C) 11 (D) 3
Answer: A

2. The solution to the system of linear congruence.
7x+3y≡10(mod 16) and
2x+5y≡9(mod 16) is:
(A) x≡2(mod 16) and y≡7(mod 16)
(B) x≡3(mod 16) and y≡7(mod 16)
(C) x≡3(mod 16) and y≡6(mod 16)
(D) x≡2(mod 16) and y≡6(mod 16)
Answer: B

3. Which one of the following field is a finite field?
(A) Z12 (B) Z13
(C) Z14 (D) Z15
Answer: B

4. Which one of the following is not a Carmichael number?
(A) 1105 (B) 2465
(C) 561 (D) None of the above
Answer: D

5. If there are m people in a group who need to communicate with each other, how many keys are needed for symmetric key cryptography?
(A) (m-1) (B) m
(C) m*(m-1) (D) (m*(m-1))/2
Answer: D

6. Brute force attack is also known as ……………. attack.
(A) pattern attack (B) cipher only
(C) statistical (D) exhaustive key search
Answer: D

7. Combination traditional additive and multiplicative cipher is:
(A) Affine (B) Ceaser
(C) Hill (D) None of these
Answer: A

8. Find the result of 710 mod 11 using Fermat’s little theorem:
(A) 2 (B) 1
(C) 3 (D) None of these
Answer: B

9. For the one way function Y=f(x), X=f-1(Y) is:
(A) Feasible (B) Infeasible
(C) Not predicted (D) None of these
Answer: B

10. In an RSA algorithm if p=7, q=11, then Φ(n) equal to …………..
(A) 61 (B) 77
(C) 76 (D) none of these
Answer: D

11. In an L.P.P. a non-negative variable added to the constraint inequality to convert it into equality is known as ……………. variable.
(A) slack (B) surplus
(C) artificial (D) none of these
Answer: A

12. An L.P.P which feasible solution is having unbounded optimal solution, then its dual is having …………….. solution
(A) an optimal (B) a feasible
(C) no feasible (D) none of these
Answer: C

13. To balance an unbounded transportation problem, where total requirement is less than total availability, it is to introduce ……………
(A) A dummy destination (B) A dummy source
(C) A dummy cell (D) None of these
Answer: A

14. The method used for solving an assignment problem is:
(A) Revised simplex (B) Hungarian
(C) Vogel’s approximation (D) none of these
Answer: B

15. If the number of arrivals in a queue in time ‘t’ follows Poisson distribution, inter arrival time follows:
(A) Poisson distribution (B) Normal distribution
(C) Exponential distribution (D) None
Answer: C

16. In a Poisson queue with arrival rate λ and service rate μ, the probability that the queuelength exceeds n is:
(A) (λ/μ)n (B) 1-(λ/μ)n
(C) (λ+μ)/λ (D) none of these
Answer: A

17. A game with game matrix [aij] is said to be fair, if:
(A) Maxi Minj aij>Minj Maxi aij
(B) Maxi Minj aij<Minj Maxi aij
(C) Maxi Minj aij=Minj Maxi aij
(D) none of these
Answer: C

18. Obtain the mixed strategy for the game with payoff matrix
(A) (1/4,3/4) (B) (3/4,1/4)
(C) (1/2,1/2) (D) none of these
Answer: A

19. In an inventory control model, time between placing an order and its arrival in stock is:
(A) Set up time (B) Lead time
(C) Order time (D) None of these
Answer: B

20. Customer arrives in a single man service counter according to Poisson process. Average arrival rate is 20 per hour and average service rate is 36 per hour then the average waiting time of a customer in the queue is,
(A) 110 sec (B) 125 sec
(C) 140 sec (D) none of these
Answer: B

21. In algorithms O(n2) is called:
(A) linear (B) exponential
(C) quadratic (D) none of these
Answer: C

22. Control abstraction is a term related to:
(A) dynamic programming (B) greedy
(C) backtrack (D) none of these
Answer: D

23. Performance measure of an algorithm is concerned with obtaining the space and …………. requirement.
(A) Complexity (B) Time
(C) Direction (D) None of these
Answer: B

24. The name backtrack was first coined by:
(A) D.H. Lehmer (B) R.J. Waker
(C) S. Golomb (D) L. Baumest
Answer: A

25. In a state space tree a node which has been generated and all of whose children have not yet been generated is called:
(A) dead node (B) leaf node
(C) live node (D) none of these
Answer: C

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