Patni Placement Question Paper(sample)

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Patni QuestionsQ1) The ratio of the areas of the in circle and circum circle of an equilateral triangle is

a) 1: 4
b) 11:9
c) 12:1
d) 11:3

Q2). A circular road runs round a circular ground. If the difference between the circumference of the outer circle and inner circle is 44 meters, the width of the road is.

a) 7m
b) 11m
c) 22m
d) 44m

Q3). A rectangle plate has an area of 80 sqm. If its length is 5 times than the breadth, then length of the plate is
a). 16
b) 20
c) 4
d) 80

Q4). Three spherical metal balls of radii 6cm,8cm and R cm are melted into a solid sphere of radius 12cm. The value of R is

a) 5cm
b) 6cm
c) 8cm
d) 10cm

Q5). If a/b = 1/3 and 3a + 2b = 6 then, b is

a) 3
b) 6
c) 2
d) 1

Q6). The digits of the integral part of the square root of 123456789 is

a) 6
b) 5
c) 8
d) 3

Q7). The sum of all multiples of 6 lying between 50 and 100 is

a) 600
b) 96
c) 150
d) none

Q8). The greatest factor of the product of any four consecutive integral number in all cases, is
a) 25
b) 24
c) 16
d) 20

Q9). Two third of the square of a number is 1.5, the number is

a) 1
b) 1.5
c) 2.5
d) 2/3

Q10). Two persons cover the same distance 5 kmph and 6 kmph respectively. Find the distance traveled by each., if one takes 16 minutes longer than the other.


a) 5
b) 60
c) 8
d) 16

Q11). The price of cycle is increased by 10% every year. If the present price of cycle is Rs. 1,210 , its price two years ago was ?

a) 1,000
b) 2,100
c) 1,700
d) 1,900

Q12). 10% 0f 25 is 5% of x. Then x

a) 10
b) 5
c) 100
d) 50





Q13). If the side of the square is increased by 20% then the area of the square is increased by

a) 69%
b) 96%
c) 44%
d) 10%

Q14). If G is finite group of order 3, then

a) G is always abelian
b) G is always non-abelian
c) G may be abelian
d) none

Q15). Let Q be the set of all rational numbers and P be the set of all irrational numbers. Then

a) P is closed for addition but Q is not closed for addition
b) P as well as Q is closed for addition
c) Q is closed for addition for Q is not closed for addition
d) none of the above


Oracle Interview Questions and Answers

Oracle Interview Questions and Answers : SQL
1. To see current user name
Sql> show user;
2. Change SQL prompt name
SQL> set sqlprompt "Manimara > "
Manimara >
Manimara >
3. Switch to DOS prompt
SQL> host
4. How do I eliminate the duplicate rows ?
SQL> delete from table_name where rowid not in (select max(rowid) from table group by
duplicate_values_field_name);
or
SQL> delete duplicate_values_field_name dv from table_name ta where rowid <(select min(rowid) from
table_name tb where ta.dv=tb.dv);
Example.
Table Emp
Empno Ename
101 Scott
102 Jiyo
103 Millor
104 Jiyo
105 Smith
delete ename from emp a where rowid < ( select min(rowid) from emp b where a.ename = b.ename);
The output like,
Empno Ename
101 Scott
102 Millor
103 Jiyo
104 Smith
5. How do I display row number with records?
To achive this use rownum pseudocolumn with query, like SQL> SQL> select rownum, ename from emp;
Output:
1 Scott
2 Millor
3 Jiyo
4 Smith
6. Display the records between two range
select rownum, empno, ename from emp where rowid in
(select rowid from emp where rownum <=&upto
minus
select rowid from emp where rownum<&Start);
Enter value for upto: 10
Enter value for Start: 7
ROWNUM EMPNO ENAME
--------- --------- ----------
1 7782 CLARK
2 7788 SCOTT
3 7839 KING
4 7844 TURNER
7. I know the nvl function only allows the same data type(ie. number or char or date
Nvl(comm, 0)), if commission is null then the text "Not Applicable" want to display, instead of
blank space. How do I write the query?
SQL> select nvl(to_char(comm.),'NA') from emp;
Output :
NVL(TO_CHAR(COMM),'NA')
-----------------------
NA
300
500
NA
1400
NA
NA
8. Oracle cursor : Implicit & Explicit cursors
Oracle uses work areas called private SQL areas to create SQL statements.
PL/SQL construct to identify each and every work are used, is called as Cursor.
For SQL queries returning a single row, PL/SQL declares all implicit cursors.
For queries that returning more than one row, the cursor needs to be explicitly declared.
9. Explicit Cursor attributes
There are four cursor attributes used in Oracle
cursor_name%Found, cursor_name%NOTFOUND, cursor_name%ROWCOUNT, cursor_name%ISOPEN
10. Implicit Cursor attributes
Same as explicit cursor but prefixed by the word SQL
SQL%Found, SQL%NOTFOUND, SQL%ROWCOUNT, SQL%ISOPEN
Tips : 1. Here SQL%ISOPEN is false, because oracle automatically closed the implicit cursor after
executing SQL statements.
: 2. All are Boolean attributes.
11. Find out nth highest salary from emp table
SELECT DISTINCT (a.sal) FROM EMP A WHERE &N = (SELECT COUNT (DISTINCT (b.sal)) FROM EMP B
WHERE a.sal<=b.sal);
Enter value for n: 2
SAL
---------
3700
12. To view installed Oracle version information
SQL> select banner from v$version;
13. Display the number value in Words
SQL> select sal, (to_char(to_date(sal,'j'), 'jsp'))
from emp;
the output like,
SAL (TO_CHAR(TO_DATE(SAL,'J'),'JSP'))
--------- -----------------------------------------------------
800 eight hundred
1600 one thousand six hundred
1250 one thousand two hundred fifty
If you want to add some text like,
Rs. Three Thousand only.
SQL> select sal "Salary ",
(' Rs. '|| (to_char(to_date(sal,'j'), 'Jsp'))|| ' only.'))
"Sal in Words" from emp
/
Salary Sal in Words
------- ------------------------------------------------------
800 Rs. Eight Hundred only.
1600 Rs. One Thousand Six Hundred only.
1250 Rs. One Thousand Two Hundred Fifty only.
14. Display Odd/ Even number of records
Odd number of records:
select * from emp where (rowid,1) in (select rowid, mod(rownum,2) from emp);
1
3
5
Even number of records:
select * from emp where (rowid,0) in (select rowid, mod(rownum,2) from emp)
2
4
6
15. Which date function returns number value?
months_between
16. Any three PL/SQL Exceptions?
Too_many_rows, No_Data_Found, Value_Error, Zero_Error, Others
17. What are PL/SQL Cursor Exceptions?
Cursor_Already_Open, Invalid_Cursor
18. Other way to replace query result null value with a text
SQL> Set NULL 'N/A'
to reset SQL> Set NULL ''
19. What are the more common pseudo-columns?
SYSDATE, USER , UID, CURVAL, NEXTVAL, ROWID, ROWNUM
20. What is the output of SIGN function?
1 for positive value,
0 for Zero,
-1 for Negative value.
21. What is the maximum number of triggers, can apply to a single table?
12 triggers.

SiliconIndia Mentor Graphics Leadership Awards for Embedded/VLSI industry..

SiliconIndia Mentor Graphics Leadership Awards for Embedded/VLSI industry..


Best VLSI/Embedded Design

MNC Company

Qualcomm

Best VLSI/Embedded Design

Indian Company

HCL

Best VLSI/Embedded Design

Startup Company

Cosmic Circuits

Best Electronic System Design

MNC Company

Cisco

Best Electronic System Design

Indian Company

Tejas Networks

Best Electronic System Design

Startup Company

Redpine Signals

Award for Youngest Entrepreneur

in Semiconductor space

Notion Ink Team

(Rohan Shravan, Rohit Rathi and

Sachin Ralhan)

Outstanding contribution to

VLSI/Embedded Design Industry

(Corporate)

Wipro

Outstanding contribution to

VLSI Embedded Design Industry

(Academic Institution)

IIT Kharagpur

Outstanding contribution to

VLSI/Embedded Design Industry

(Individual)

Dr.Bobby Mitra, President and

Managing Director of

Texas Instruments India



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