all the questions of ISRO 2020 question paper

# Recent questions tagged isro-2020

1
The following circuit compares two $2$-bit binary numbers, $X$ and $Y$ represented by $X_1X_0$ and $Y_1Y_0$ respectively. ($X_0$ and $Y_0$ represent Least Significant Bits) Under what conditions $Z$ will be $1$? $X>Y$ $X<Y$ $X=Y$ $X!=Y$
1 vote
2
For the distributions given below: Which of the following is correct for the above distributions? Standard deviation of $A$ is significantly lower than standard deviation of $B$ Standard deviation of $A$ is slightly lower than standard deviation of $B$ Standard deviation of $A$ is same as standard deviation of $B$ Standard deviation of $A$ is significantly higher than standard deviation of $B$
3
The hardware implementation which provides mutual exclusion is Semaphores Test and set instructions Both options None of the options
4
If $x+2y=30$, then $\left(\dfrac{2y}{5}+\dfrac{x}{3} \right) + \left (\dfrac{x}{5}+\dfrac{2y}{3} \right)$ will be equal to $8$ $16$ $18$ $20$
5
Checksum field in TCP header is ones complement of sum of header and data in bytes ones complement of sum of header, data and pseudo header in $16$ bit words dropped from $\text{IPv6}$ header format better than $\text{md5}$ or $\text{sh1}$ methods
6
Consider a $2$-dimensional array $x$ with $10$ rows and $4$ columns, with each element storing a value equivalent to the product of row number and column number. The array is stored in row-major format. If the first element $x[0][0]$ occupies the memory location with ... location, which all locations (in decimal) will be holding a value of $10$? $1018,1019$ $1022,1041$ $1013,1014$ $1000,1399$
7
Which one indicates a technique of building cross compilers? Beta cross Canadian cross Mexican cross X-cross
8
A computer which issues instructions in order, has only $2$ registers and $3$ opcodes $\text{ADD, SUB}$ and $\text{MOV}$. Consider $2$ ... and by how many $\text{MOV}$ instructions? $\text{Case 2,2}$ $\text{Case 2,3}$ $\text{Case 1,2}$ $\text{Case 1,3}$
9
10
What is the output of the code given below? # include<stdio.h> int main() { char name[]="satellites"; int len; int size; len= strlen(name); size = sizeof(name); printf("%d",len*size); return 0; } $100$ $110$ $40$ $44$
11
A given grammar is called ambiguous if two or more productions have the same non-terminal on the left hand side a derivation tree has more than one associated sentence there is a sentence with more than one derivation tree corresponding to it brackets are not present in the grammar
12
Consider the following recursive C function that takes two arguments unsigned int rer(unsigned int n, unsigned int r){ if(n>0)return(n%r + rer(n/r,r)); else retturn 0; } What is the return value of the function $rer$ when it is called as $rer(513,2)$? $9$ $8$ $5$ $2$
13
Remote Procedure Calls are used for communication between two processes remotely different from each other on the same system communication between two processes on the same system communication between two processes on the separate systems none of the above
14
Which of the following is a type of a out-of-order execution, with the reordering done by a compiler loop unrolling dead code elimination strength reduction software pipelining
15
Minimum number of states required in DFA accepting binary strings not ending in $”101”$ is $3$ $4$ $5$ $6$
1 vote
16
Which of the following classes of languages can validate an $\text{IPv4}$ address in dotted decimal format? It is to be ensured that the decimal values lie between $0$ and $255$. RE and higher CFG and higher CSG and higher Recursively enumerable language
1 vote
17
The language which is generated by the grammar $S \rightarrow aSa \mid bSb \mid a \mid b$ over the alphabet of $\{a,b\}$ is the set of Strings that begin and end with the same symbol All odd and even length palindromes All odd length palindromes All even length palindromes
18
Which of the following is true? Every subset of a regular set is regular Every finite subset of non-regular set is regular The union of two non regular set is not regular Infinite union of finite set is regular
1 vote
19
Context free languages are closed under union, intersection union, kleene closure intersection, complement complement, kleene closure
20
A non-pipelined CPU has $12$ general purpose registers $(R0,R1,R2, \dots ,R12)$. Following operations are supported $\begin{array}{ll} \text{ADD Ra, Rb, Rr} & \text{Add Ra to Rb and store the result in Rr} \end{array}$ ... $X,Y,Z$ are initially available in registers $R0,R1$ and $R2$ and contents of these registers must not be modified. $5$ $6$ $7$ $8$
21
An array of $2$ ...
22
Properties of $\text{ DELETE'}$ and $\text{ TRUNCATE'}$ commands indicate that After the execution of $\text{ TRUNCATE'}$ operation, $\text{COMMIT}$, and $\text{ROLLBACK}$ statements cannot be performed to retrieve the lost data, while $\text{ DELETE'}$ allow it ... not allow it After the execution of $\text{ DELETE'}$ and $\text{ TRUNCATE'}$ operation no retrieval is possible for the lost data
23
How many total bits are required for a direct-mapped cache with $128$ KB of data and $1$ word block size, assuming a $32$-bit address and $1$ word size of $4$ bytes? $2$ Mbits $1.7$ Mbits $2.5$ Mbits $1.5$ Mbits
24
A magnetic disk has $100$ cylinders, each with $10$ tracks of $10$ sectors. If each sector contains $128$ bytes, what is the maximum capacity of the disk in kilobytes? $1,280,000$ $1280$ $1250$ $128,000$
25
Avalanche effect in cryptography refers Large changes in cipher text when the keyword is changed minimally Large changes in cipher text when the plain text is changed Large Impact of keyword change to length of the cipher text None of the above
1 vote
26
In a columnar transportation cipher, the plain text is the tomato is a plant in the night shade family , keyword is $\text{TOMATO}$ . The cipher text is $\text{ TINESAX / EOAHTFX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX }$ ... $\text{ EOAHTFX / TINESAX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX }$
27
Which of the following is an efficient method of cache updating? Snoopy writes Write through Write within Buffered write
The persist timer is used in TCP to To detect crashes from the other end of the connection To enable retransmission To avoid deadlock condition To timeout FIN_Wait$1$ condition
To send same bit sequence, $\text{NRZ}$ encoding require Same clock frequency as Manchester encoding Half the clock frequency as Manchester encoding Twice the clock frequency as Manchester encoding A clock frequency which depend on number of zeroes and ones in the bit sequence
The SQL query SELECT columns FROM TableA RIGHT OUTER JOIN TableB ON A.columnName = B.columnName WHERE A.columnName IS NULL returns the following: All rows in Table $B$, which meets equality condition above and, none from Table $A$ which meets the condition. All rows ... condition. All rows in Table $B$, which meets the equality condition All rows in Table $A$, which meets the equality condition