ISRO 2009 Computer Science (CS) questions with solution

# Recent questions tagged isro2009 1
Process is A program in high level language kept on disk Contents of main memory A program in execution A job in secondary memory
2
Which of the following contains complete record of all activity that affected the contents of a database during a certain period of time? Transaction log Query language Report writer Data manipulation language
3
Activities which ensure that the software that has been built, is traceable to customer requirement is covered as part of Verification Validation Maintenance Modeling
4
If the pdf of a Poisson distribution is given by $f(x) = \frac{e^{-2} 2^x}{x!}$ then its mean is $2^x$ $2$ $-2$ $1$
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If the mean of a normal frequency distribution of 1000 items is 25 and its standard deviation is 2.5, then its maximum ordinate is $\frac{1000}{\sqrt{2 \pi} } e^{-25}$ $\frac{1000}{\sqrt{2 \pi} }$ $\frac{1000}{\sqrt{2 \pi} } e^{-2.5}$ $\frac{400}{\sqrt{2 \pi} }$
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If A, B, C are any three matrices, then A'+B'+C' is equal to a null matrix A+B+C (A+B+C)' -(A+B+C)
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If $\begin{vmatrix} 3 && 3 \\ x && 5 \end{vmatrix} =3$ then the value of $x$ is 2 3 4 5
8
If two adjacent rows of a determinant are interchanged, the value of the determinant becomes zero remains unaltered becomes infinitive becomes negative of its original value
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A square matrix A is called orthogonal if A'A= I A -A -I
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A simple graph ( a graph without parallel edge or loops) with $n$ vertices and $k$ components can have at most $n$ edges $n-k$ edges $(n-k) (n-k+1)$ edges $(n-k) (n-k+1)/2$ edges
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In a graph G there is one and only one path between every pair of vertices then G is a Path Walk Tree Circuit
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A graph in which all nodes are of equal degree, is known as Multigraph Non regular graph Regular graph Complete graph
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If G is a graph with e edges and n vertices the sum of the degrees of all vertices in G is e e/2 e$^2$ 2 e
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The formula $P_k = y_0 + k \triangledown y_0+ \frac{k(k+1)}{2} \triangledown ^2 y_0 + \dots + \frac{k \dots (k+n-1)}{n!} \triangledown ^n y_0$ is Newton's backward formula Gauss forward formula Gauss backward formula Stirling's formula
15
The value of $x$ at which $y$ is minimum for $y=x^2 -3x +1$ is -3/2 3/2 0 -5/4
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$x=a \cos(t), y=b \sin(t)$ is the parametric form of Ellipse Hyperbola Circle Parabola
17
The cubic polynomial $y(x)$ which takes the following values: $y(0)=1, y(1)=0, y(2)=1$ and $y(3)=10$ is $x^3 +2x^2 +1$ $x^3 +3x^2 -1$ $x^3 +1$ $x^3 -2x^2 +1$
18
The formula $\int\limits_{x0}^{xa} y(n) dx \simeq h/2 (y_0 + 2y_1 + \dots +2y_{n-1} + y_n) - h/12 (\triangledown y_n - \triangle y_0)$ $- h/24 (\triangledown ^2 y_n + \triangle ^2 y_0) -19h/720 (\triangledown ^3 y_n - \triangle ^3 y_0) \dots$ is called Simpson rule Trapezoidal rule Romberg's rule Gregory's formula
19
The shift operator $E$ is defined as $E [f(x_i)] = f (x_i+h)$ and $E'[f(x_i)]=f (x_i -h)$ then $\triangle$ (forward difference) in terms of $E$ is $E-1$ $E$ $1-E^{-1}$ $1-E$
20
The feature in object-oriented programming that allows the same operation to be carried out differently, depending on the object, is Inheritance Polymorphism Overfunctioning Overriding
21
A full binary tree with $n$ leaves contains $n$ nodes $\log_2 n$ nodes $2n-1$ $2^n$ nodes
22
The infix expression $A+(B-C)^*D$ is correctly represented in prefix notation as $A+B-C^*D$ $+A^*-BCD$ $ABC-D^*+$ $A+BC-D^*$
23
Consider the following boolean function of four variables $f(w,x,y,z) = \Sigma(1,3,4,6,911,12,14)$, the function is Independent of one variable Independent of two variables Independent of three variables Dependent on all variables
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Consider a set of 5 processes whose arrival time, CPU time needed and the priority are given below: Process Priority Arrival Time (in ms) CPU Time Needed Priority P1 0 10 5 P2 0 5 2 P3 2 3 1 P4 5 20 4 P5 10 2 3 (smaller the number, higher the priority) If the CPU scheduling policy is priority scheduling without pre-emption, the average waiting time will be 12.8 ms 11.8 ms 10.8 ms 09,8 ms
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A page fault Occurs when a program accesses an available page on memory is an error in a specific page is a reference to a page belonging to another program occurs when a program accesses a page not currently in memory
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The correct matching of the following pairs is (A) Disk check (1) Round robin (B) Batch processing (2) Scan (C) Time sharing (3) LIFO (D) Stack operation (4) FIFO A B C D a 3 4 2 1 b 4 3 2 1 c 3 4 1 2 d 2 4 1 3
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Which of the following is a MAC address? 192.166.200.50 00056A:01A01A5CCA7FF60 568, Airport Road 01:A5:BB:A7:FF:60