HCL System Software Sample Test Paper
Section 1- General Computer Concepts1. Piggy backing is a technique for
a) Flow control b) Sequence c) Acknowledgement d) retransmition (Ans. (c))
2. In OSI, terminal emulation is done in
(a) sessions layer (b) application layer (c) presentation layer
(d) transport layer (Ans. (b))
3.Bit parity check, when performed on a byte ,can catch
a)odd number of errors b)even number of errors c)any number of errors
d)none of the above (Ans. (a))
4. In signed magnitude notation what is the minimum value that can be represented with 8 bits
(a) -128 (b) -255 (c) -127 (d) 0 (Ans. (a))
5. For 1 MB memory, the number of address lines required,
(a) 11 (b) 16 (c) 20 (d) 24 (Ans. (c))
6.For a 25 MHz processor, what is the time taken by the instruction which needs 3 clock cycles,
(a) 120 nano secs (b) 120 micro secs (c) 75 nano secs (d) 75 micro secs (Ans. (a))
7. Semaphore is used for
(a) synchronization (b) dead-lock avoidence (c) both a and b (d) none (Ans. (a))
8. Which of the following involves context switch,
(a) system call (b) priviliged instruction c) floating poitnt exception
(d) all the above (e) none of the above (Ans: (a))
9.Virtual address are translated to physical address by
(a) the process (b) operating system (c) MMU (d) All of the above
(e) None of the above (ans. (c))
10.Convert the hexadecimal number 0xFEDB to the octal (ans.77333)
11. OLE is a mechanism
a) in UNIX for network communication b) in INTERNET for communication between nodes
c) for communication between processes in a NT system
d) used as a network layer protocol in NT & Windows systems (ans. (d))
12. An internet IP address of a node
a) has to be unique only for the domain of the node
b) has to be unique in the node’s sub-network
c) has to be unique in the country in which the node is present
d) none of the above (ans. (b))
13. There is an employee table with key fields as employer no.data in every not row are needed for a sample.
Which of the following queries will get required results.
Select A employee no. from employee A , where exists (select (max (emp_no)))from employee B where
A employee no. >= B employee having (count(*) mod n)=0
Select employee no. from employee A, employee B where A. employee no.>=B employ no.group by employee no.having(count(*) mod n)=0 )
c) both a& b d)none of the above (ans. (d))
14. Type duplicates of a row in a table customer with non-unique key field customer no. Can use
a) Delete from customer where customer no. Exists(select distinct customer no. from customer having count)
delete customer a where customer no. in (select cust_no from customer b where a.cust_no=b.cust_no)
and a.rowid>b.rowid
delete customer a where custermor no. in ( select customer no. from customer a, customer b group by
a.cust_no having (count(*)>1) and a.rowid>b.rowid);
d) none of the above (ans. (d))
15.which of the following is a feature of the ANSI C language and not present in Java?
a)forward referencing b)variable length argument lists c)volatile modifier d)none of the above (ans. (b))
section 2 – C Programming1.which of the following about the following two declarations is true
i) int *F();
ii)int (*F)();
a)Both are identical b)the first is a correct declaration and second is wrong
c)the first declaration is a function returning a pointer to an integer and the second is a pointer to a function
returning int
d)Both are different ways of declaring pointer to a function (ans. (c))
2.what are the values printed by the following program?
#define dprintf(expr) printf("expr=%d\n”,expr)
main() {
int x=7;
int y=3;
dprintf(x/y); }
a)#2=2 b)expr=2 c)x/y=2 d)none (ans.( c))
3.which of the following is true of the following program
main() {
char *c;
int *ip;
c=(char *)malloc(100);
ip=(int *)c;
free(ip); }
a)the code functions properly by releasing all the memory allocated
b)results in compilation error as a pointer of various types cannot be equated
c)the program ties to free more memory than allocated and results in run time error
d) works well except when the machine runs low on memory and malloc is unabel to allocate the memory (ans. (d))
4.output?
main() {
int i;
char *p;
i=0x89;
p=(char *)i;
p++;
printf(“%x\n”p); }
a)0x8c b)0x4566788A c)0x8A d)0x8B e)none (ans. (c))
5.which of the following is not an ANSI C language keyword?
a)volatile b)function c)default d)const e)void (ans. (b))
6.when an array is passed as parameter to a function , which of the following statement is correct
the function can change values in the original array
in c parameters are passed by value the function cannot change the original value in the array
it results in compilation error.Array cannot be passed as a parameter to a function
results in runtime error when the function tries to access the elements in the array
7.the type of the controlling expression of a switch statement cannot be of the type
a)int b)char c)short d)float e)none (ans.(d))
8.value of (3^6)+(a ^a)=? (Ans. value=5)
9.x= b>8?b<<3:b>4?b>>1:b; (ans. x=3)
10.output:
main() {
int n=2;
printf(“%d %d\n”,++n,n*n); }
a)3,6 b)3,4 c)2,4 d)cannot determine (ans.( b))
11.output:
int x=0x65;
main() {
char x;
printf(“%d\n”,x); }
a) Compilation error b)’A’ c)65 d)undefined
12.output
main() {
int a=10;
int b=6;
if(a=3)
b++;
printf(“%d %d”,a,b++); }
a)10,6 b)10,7 c)3,6 d)3,7 e)none
13.main() {
enum months {jan=1,feb,mar,apr};
months x=jan;
if(x==1)
printf(“jan is the first month”); }
a)does not print anything b)prints : jan is the first month
c)generates compilation error d)results in runtime error (ans. (c))
14.what is the output of the following program?
Main() {
char *src=”hello world”;
char dst[100];
strcpy(src,dst);
printf(“%s”,dst); }
strcpy(char *dst,char *src) {
while (*src) *dst++=*src++; }
a)”hello world” b)”hello” c)”world” d)NULL e)undefined (ans. (e))
15.main() {
int i=6;
switch(i) {
default: i+=2;
case 4;i=4;
case 5:i++;
break; }
printf(“%d”,i); }
a)8 b)6 c)5 d)4 e)none (ans. (c))
16.main() {
int x=20;
int y=10;
swap(x,y);
printf(“%d %d”,y,x+2); }
swap(int x,int y) {
int temp;
temp=x;
x=y;
y=temp; }
a)10,20 b)20,12 c)22,10 d)10,22 e)none
17.#define INC(x) x++
main() {
int x=4;
printf(“%d”,INC(x++)); }
a)4 b)5 c)6 d)compilation error e)runtime error (ans.(d))
18.struct node{
char *word;
int count;
struct node left;
struct node right; };
a)incorrect definiton b)structures cannot refer to other structrues
c)structures can refer to themselves. Hence the statement is ok
d)structures can refer to maximum of one other structure
19.what is the size of the following union
union tag{
int a;
float b;
char c; };
a)2 b)4 c)1 d)7 (ans.(b))
20. main() {
char s[]=”hello world”;
printf(“%15.10s”,s); }
a)hello,.world… b)…..hello world c)heloo,.wor….. d)none of the above (ans.(b))
section C – analysing program segements1)struct dlink{
int nodeid;
struct dlink *next;
struct dline *prev;
} dlink_t;
A pointer to the head of that linked list is maintained as a global variable whose definition is
dlink_t *head;
The function remove_element(dlink_t*rp), needs to remove the node pointed to by rp and adjust the head The
first node’s prev and the last node’s text are NULL
remove_element (dlink_t *rp)
{
rp->prev->next =rp->next;
rp->next->prev =rp->prev;
if(head ==rp)
head =rp->next;
} which of the following statement is true about the function remove_element
a)it works when head is the same as rp; b)it does not work whe rp is the last element on the list
c)it sets the head of the list correctly d)it works in all cases (ans.(b))
2.#define NULL 0
char *
index (sp,c)
register char *sp,c;
{
do {
if(*sp==c)
return(sp);
}while (*sp++);
return (NULL); }
The first argument sp,is a pointer to a C string. The second argument c is a character. This function searches
for the character c in the string. If it is found a pointer to that location is returned, else NULL is returned.
This function works
a)Always b)always but fails when the first byte contains the character c
c)works when c is a non NULL character array
d)works only when the character c is found in the string ans. A)Always
3.main() {
printf(“%dn”,f(7)); }
f(x) {
if(x<=4)
return x;
return f(--x); }
a)4 b)5 c)6 d)7 (ans.(4))
4.on a machine where pointers are 4 bytes long,what happens when the following code is executed
main() {
int x=0 ,*p=0;
x++;p++;
printf(“%d and %dn”,p); }
a.1 and 1 is printed b.1 and 4 c.4 and 4 d.causes an exception
5.which is correct?
a)strcpy(char *dst,char *src) {
while (*src)
*dst++=*src++; }
b) strcpy(char *dst,char *src) {
while (*dst++=*src++); }
c) strcpy(char *dst,char *src) {
while (*src){ *dst=*src;
dst++;src++; } }
d) strcpy(char *dst,char *src) {
while (*++dst=*++src); }
6. main() {
int i=20,*j=&i;
f1(j);
*j+=10;
f2(j);
printf(“%d and %d ‘,i,*j); }
f1(k)
int *k;
{ *k+=15;}
f2(x)
int *x;
{ int m=*x, *n=&m;
*n+=10; } The values printed by the program will be
a)20 and 55 b)20 and 45 c)45 and 45 d)55 and 55 e)35 and 35 (ans.(c))or d
7.int
func(int x) {
if(x<=0)
return (1);
return func(x-1)+x; }
main() {
printf(“%d”,func(5)); }
a)12 b)16 c)15 d)11 ans: b
8.consider the following fragments of c code in two files which will be linked together and executed
a.c
int i;
main() {
i=30;
f1();
printf(“%d”,i); }
b.c
static int f1() {
i+=10; } which of the following is true?
a)a.c will fail in compilation phase because f1() is not declared
b)b.c will fail in compilation because the variable i is not declared
c)will print 30 d)a & b
9. void
funca(int *k) {
*k+=20; }
void
funcb(int *k) {
int m=*x,*n=&m;
*n+=10; }
main() {
int var=25,;
*varp=&var;
funca(varp)
*varp+=10;
funcb(varp);
printf("%d%d,var,*varp); }
(a) 20,55(b) 35,35(c) 25,25(d)55,55 (ans. (d))
10. #include
class x{
public :
int a;
x(); };
x::x() { a=10;cout<< a ;}
class b:public x {
public :
b(); x(); };
b::b() { a=20;cout<<A;}
main() {
b temp; } what will be the output of the following program?
a)10 b)20 c)20 10 d)10 20
