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31.

Given i = √-1 , what will be the evaluation of the definite integral
_o∫^π/2 (cos x+ isinx)/(cosx- isinx) dx [2 marks]
(A) 0
(B) 2
(C) –i
(D) i

asked in Computer Science And Engineering, 2011

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32.

Consider a database table T containing two columns X and Y each of type integer. After the creation of the table, one record (X=1, Y=1) is inserted in the table.
Let MX and MY denote the respective maximum values of X and Y among all records in the table at any point in time. Using MX and MY, new records are inserted in the table 128 times with X and Y values being MX + 1, 2*MY + 1 respectively. It may be noted that each time after the insertion, values of MX and MY change.
What will be the output of the following SQL query after the steps mentioned above are carried out?
SELECT Y FROM T WHERE X=7; [2 marks]
(A) 127
(B) 255
(C) 129
(D) 257

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2011

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33.

Consider a finite sequence of random values X=[x₁, x₂, .....,x_n]. Let µ_x be the mean and σ_x be the standard deviation of X. Let another finite sequence Y of equal length be derived from this as y_i = ax_i + b where a and b are positive constants. Let µ_y be the mean and σ_y be the standard deviation of this sequence. Which one of the following statements is INCORRECT? [2 marks]
(A) Index position of mode of X in X is the same as the index position of mode of Y in Y.
(B) Index position of median of X in X is the same as the index position of median of Y in Y.
(C) µ_y = aµ_x + b
(D) σ_y = aσ_x +b

asked in Computer Science And Engineering, 2011

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34.

A deck of 5 cards (each carrying a distinct number from 1 to 5) is shuffled thoroughly. Two cards are then removed one at a time from the deck. What is the probability that the two cards are selected with the number on the first card being one higher than the number on the second card? [2 marks]
(A) 1/5
(B) 4/25
(C) 1/4
(D) 2/5

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2011

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35.

Consider the following table of arrival time and burst time for three processes P0, P1 and P2.

Process Arrival Time Burst Time

P0 0 ms 9 ms

P1 1 ms 4 ms

P2 2 ms 9 ms

The pre-emptive shortest job first scheduling algorithm is used. Scheduling is carried out only at arrival or completion of processes. What is the average waiting time for the three processes? [2 marks]
(A) 5.0 ms
(B) 4.33 ms
(C) 6.33 ms
(D) 7.33 ms

last reply by CpjJwWHV • 13 years ago • asked in Computer Science And Engineering, 2011

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36.

Consider evaluating the following expression tree on a machine with load-store architecture in which memory can be accessed only through load and store instructions. The variables a, b, c, d and e are initially stored in memory. The binary operators used in this expression tree can be evaluated by the machine only when the operands are in registers. The instructions produce result only in a register. If no intermediate results can be stored in memory, what is the minimum number of registers needed to evaluate this expression?

[2 marks]
(A) 2
(B) 9
(C) 5
(D) 3

last reply by CpjJwWHV • 13 years ago • asked in Computer Science And Engineering, 2011

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