Interview Questions from OS which does a regular round in campus recruitment.  


  1. What do the system calls fork(), vfork(), exec(), wait(), waitpid() do? Whats a Zombie process? Whats the difference between fork() and vfork()?

  2. How does freopen() work?

  3. What are threads? What is a lightweight process? What is a heavyweight process? How different is a thread from a process?

  4. How are signals handled?

  5. What is a deadlock?

  6. What are semaphores?

  7. What is meant by context switching in an OS?

  8. What is Belady's anomaly?

  9. What is thrashing?

  10. What are short-, long- and medium-term scheduling?

  11. What are turnaround time and response time?

  12. What is the Translation Lookaside Buffer (TLB)?

  13. What is cycle stealing?

  14. What is a reentrant program?

  15. When is a system in safe state?

  16. What is busy waiting?

  17. What is pages replacement? What are local and global page replacements?

  18. What is meant by latency, transfer and seek time with respect to disk I/O?

  19. What are monitors? How are they different from semaphores?

  20. In the context of memory management, what are placement and replacement algorithms?

  21. What is paging? What are demand- and pre-paging?

  22. What is mounting?

  23. What do you mean by dispatch latency?

  24. What is multi-processing? What is multi-tasking? What is multi-threading?

  25. What is multi-programming?

  26. What is compaction?

  27. What is memory-mapped I/O? How is it different frim I/O mapped I/O?

  28. List out some reasons for process termination.

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TCS PAPER ON 19th MARCH  

SECTION 1
THIS SECTION CONSISTS OF 10 SYNONYMS AND 10 ANTONYMS

ALL THE QUESTIONS ARE FROM BARRON BOOK YOU MUST BE THOROUGH WITH THE HIGH FREQUENCY WORDS AND YOU MUST SOLVE PREVIOUS YEARS PAPERS .


SOME OF THE WORDS WHICH I REMEMBER AM GIVINGING FOR YOUR REFERENCE

1. INFIRM

2. DRUDGERY

3. DEADBEAT

4. ENERVATE

5. PRAGMATISTIC

6. MASTHEAD


SORRY FRIENDS I REMEMBER ONLY THIS MUCH WORDS BUT YOU MUST BE THOROUGH WITH THIS SECTION

FOR THIS BE CAREFUL. OTHER THAN THIS ONE PASSAGE WAS THERE IT WAS ALSO FROM BARRON. I AM MENTIONING YOU THE PAGE NUMBER 443 16TH EDITION MODEL TEST NUMBER 1. OTHER THAN THIS ONE PARAGRAPH FOR FILL IN THE BLANKS WAS ALSO THERE WHICH I DON’T REMEMBER FROM WHERE THEY COLLECTED BUT IT WAS EASY SO YOU CAN SOLVE THAT ON THE SPOT ALSO.


SECTION2:

THIS SECTION WAS FOR SIMPLE APTITUDES FOR THIS JUST GO THROUGH R.S.AGARWAL AND SOLVE PREVIOUS YEARS PAPERS SOME OF THE QUESTIONS WHICH I REMEMBER I AM GIVING YOU

1. In a two-dimensional array, X (9, 7), with each element occupying 4 bytes of memory, with the address of the first element X (1, 1) is 3000, find the address of X (8, 5).

2. In the word ORGANISATIONAL, if the first and second, third and forth, forth and fifth, fifth and sixth words are interchanged up to the last letter, what would be the tenth letter from right

3. What is the largest prime number that can be stored in an 8-bit memory?

4. Select the odd one out. a. Java b. Lisp c. Smalltalk d. Eiffel.

5. Select the odd one out a. SMTP b. WAP c. SAP d. ARP

6. Select the odd one out a. Oracle b. Linux c. Ingress d. DB2

7. Select the odd one out a. WAP b. HTTP c. BAAN d. ARP

8. Select the odd one out a. LINUX b. UNIX c. SOLARIS d. SQL SEVER

9. Select the odd one out a. SQL b. DB2 c. SYBASE d. HTTP

10. The size of a program is N. And the memory occupied by the program is given by M = square root of 100N. If the size of the program is increased by 1% then how much memory now occupied?

11. A man, a woman, and a child can do a piece of work in 6 days. Man only can do it in 24 days. Woman can do it in 16 days and in how many days child can do the same work?

12. In which of the system, decimal number 384 is equal to 1234?

13. Find the value of the 678 to the base 7.

14. Number of faces, vertices and edges of a cube

15. Complete the series 2, 7, 24, 77,__

16. Find the value of @@+25-++@16, where @ denotes "square" and + denotes "square root".

17. Find the result of the following expression if, M denotes modulus operation, R denotes round-off, T denotes truncation: M(373,5)+R(3.4)+T(7.7)+R(5.8)

18. If TAFJHH is coded as RBEKGI then RBDJK can be coded as ---------

19. G(0)=-1, G(1)=1, G(N)=G(N-1) - G(N-2), G(5)= ?

20. What is the max possible 3 digit prime number?

21. A power unit is there by the bank of the river of 750 meters width. A cable is made from power unit to power a plant opposite to that of the river and 1500mts away from the power unit. The cost of the cable below water is Rs. 15/- per meter and cost of cable on the bank is Rs.12/- per meter. Find the total of laying the cable.

22. The size of a program is N. And the memory occupied by the program is given by M = square root of 100N. If the size of the program is increased by 1% then how much memory now occupied?

23. In Madras, temperature at noon varies according to -t^2/2 + 8t + 3, where t is elapsed time. Find how much temperature more or less in 4pm to 9pm .

24. The size of the bucket is N kb. The bucket fills at the rate of 0.1 kb per millisecond. A programmer sends a program to receiver. There it waits for 10 milliseconds. And response will be back to programmer in 20 milliseconds. How much time the program takes to get a response back to the programmer, after it is sent?

25. A man, a woman, and a child can do a piece of work in 6 days. Man only can do it in 24 days. Woman can do it in 16 days and in how many days child can do the same work?

26. If the vertex (5,7) is placed in the memory. First vertex (1,1) ‘s address is 1245 and then address of (5,7) is ----------

27. Which of the following are orthogonal pairs? a. 3i+2j b. i+j c. 2i-3j d. -7i+j

28. If VXUPLVH is written as SURMISE, what is SHDVD?

29. If A, B and C are the mechanisms used separately to reduce the wastage of fuel by

30%, 20% and 10%. What will be the fuel economy if they were used combined.

30. What is the power of 2? a. 2068 b.2048 c.2668

31. Complete the series. 3, 8, --, 24, --, 48, 63

32. Complete the series. 4, -5, 11, -14, 22, ---

33. A, B and C are 8 bit no’s. They are as follows:

A 1 1 0 1 1 0 1 1

B 0 1 1 1 1 0 1 0

C 0 1 1 0 1 1 0 1

Find ( (A-B) u C )=?

Hint : A-B is {A} – {A n B}

34. A Flight takes off at 2 A.M from northeast direction and travels for 11 hours to reach the destination which is in north west direction. Given the latitude and longitude of source and destination. Find the local time of destination when the

flight reaches there?

35. A can copy 50 papers in 10 hours while both A & B can copy 70 papers in 10 hours. Then for how many hours required for B to copy 26 papers?

36. A is twice efficient than B. A and B can both work together to complete a work in 7 days. Then find in how many days A alone can complete the work?

37. A finish the work in 10 days. B is 60% efficient than A. So how days does B take to finish the work?

38. A finishes the work in 10 days & B in 8 days individually. If A works for only 6 days then how many days should B work to complete A’s work?

39. Given the length of the 3 sides of a triangle. Find the one that is impossible? (HINT : sum of smaller 2 sides is greater than the other one which is larger)

40. Find the singularity matrix from a given set of matrices?(Hint det(A)==0)

41. A 2D array is declared as A[9,7] and each element requires 2 byte. If A[ 1,1 ] is stored in 3000. Find the memory of A[8,5] ?

42. Sum of slopes of 2 perpendicular st. lines is given. Find the pair of lines from the given set of options which satisfy the above condition?

43. (a) 2+3i (b)1+i (c) 3-2i (d) 1-7i .Find which of the above is orthogonal.

44. (Momentum*Velocity)/(Acceleration * distance ) find units.

45. The number 362 in decimal system is given by (1362)x in the X system of numbers find the value of X a}5 b) 6 c) 7 d) 8 e) 9

46. Given $ means Tripling and % means change of sign then find the value of $%$6-%$%6

47. My flight takes of at 2am from a place at 18N 10E and landed 10 Hrs later at a place with coordinates 36N70W. What is the local time when my plane landed.

a) 6:00 am b) 6:40am c) 7:40 d) 7:00 e) 8:00 (Hint : Every 1 deg longitude is equal to 4 minutes . If west to east add time else subtract time)

48. Find the highest prime number that can be stored in an 8bit computer.

49. Which of the following set of numbers has the highest Standard deviation?

1,0,1,0,1,0

-1,-1,-1,-1,-1,-1

1,1,1,1,1,1

1,1,0,-1,0,-1

50. Match the following:

1. Male - Boy ---> a. A type of

2. Square - Polygon ---> b. A part of

3. Roof - Building ---> c. Not a type of

4. Mushroom - Vegetables ---> d. A superset of

Ans: 1- d, 2- a, 3- b, 4- c

51. Match the following.

1. brother – sister ---> a. Part of

2. Alsatian – dog ---> b. Sibling

3. sentence – paragraph ---> c. Type of

4. car - steering ---> d. Not a type of

Ans. 1-b, 2-c, 3-a, 4-d

Remaining Questions were from Graph, pie charts, Bar chart and Venn diagram which were very easy.

SECTION THREE CONSISTS OF CRITICAL REASONING

YOU MUST BE THROUGH WITH THE BARRON GRE 12TH EDITHION CRITICAL REASONING. SEE THEY WILL TELL YOU AT THE TIME OF PPT THAT THERE WONT BE ANY SECTIONAL CUT OFF BUT I OBSERVED THAT THOSE WHO DID WELL IN APTITUDE SECTION AND NOT IN THIS SECTION WERE NOT ABLE TO CLEAR THIS ROUND. SO IF YOU ARE VNOT ABLE TO SOLVE THIS SECTION THEN SIMPLY MUGG UP ALL BECAUSE YOU DON’T HAVE ANY OPTION RATHER THAN THIS….

Q1)AN AIREDALE , A BOXER , A COLLIE, AND A DOBERMAN WIN THE TOP FOUR PRIZES IN THE KENNEL SHOW. THEIR OWNERS ARE Ms. HUNTLEY Mr. GROSSMAN AND Mr. FOSTER NOT NECESSARILY IN THAT ORDER. THEIR DOGS NAMES ARE JACK , KELLY, LAD , AND MAX, NOT NECESSARILY IN THAT ORDER

1. FIRST PRIZE IS WON BY

a) Mr. EDWARDS`S DOG

b) Ms. HUNTLEY`S DOG

c) MAX

d) JACK

e) LAD


2. Mr. GROSSMAN`S DOG

a) IS THE COLLER

b) IS THE BOXER

c) IS THE AIREDALE

d) WINS SECOND PRIZE

e) IS KELLY

3) IN WHICH OF THE FOLLOWING STATEMENTS ARE THE DOGS CORRECTLY LISTED IN DECENDING

ORDER OF THEIR PRIZES

A) KELLY;THE AIREDALE; Mr. EDWARD`S DOG

B) THE BOXER ; Mr. GROSSMAN`S DOG ; JACK

C) Mr. EDWARD`S DOG ; THE AIREDALE; LAD

a) A ONLY

b) B ONLY

c) C ONLY

d) A AND C ONLY

e) B AND C ONLY

4) LAD

a) IS OWNED BY Mr. FOSTER

b) IS OWNED BY Mr. EDWARDS

c) IS THE BOXER

d) IS THE COLLIE

e) WINS THIRD PRIZE

2 MORE EASY QUESTIONS WERE ALSO THERE THAT YOU CAN GET AT THE BARRON BOOK

ALL THE QUESTIONS FROM THE CRITICAL REASONING BOOK WERE AVAILABLE THERE BUT AS THE TEST WAS ONLINE SO EACH ONE WAS GETTING DIFFERENT QUESTIONS YOU MUST BE THROUGH WITH THIS SECTION………

TECHNICAL INTERVIEW

MY TECHNICAL INTERVIEW WAS VERY GOOD FROM THE FIRST QUESTION ITSELF I GOT MY CONFIDENCE THEY PRAISED ME FOR MY FIRST ANSWER

MY QUESTIONS WERE

1) WHAT IS CLASS, OBJECT?

2) WHAT IS PROTECTED AND PRIVATE?

3) WHAT IS PROCEDURE ORIENTED?

4) WHAT IS POLYMORPHISM?

5) AFTER THAT THEY GAVE ME 2 PROGRAMS TO WRITE.

YOU MUST BE BOLD AND WELL MANNERED WHILE ATTENDING THE INTERVIEW. WHEN I ENTERED AND I OFFERED MY HAND FOR SHAKE HAND THEY GAVE ME WARM RESPONSE THEY LEFT THEIR CHAIR AND WHILE SHAKING HANDS WITH ME THEY TOLD ME`` HI RAHUL I AM

VIKRAM AND HI RAHUL I AM GANESH” THEIR BEHAVIOUR WAS SO FRIENDLY . THEY ASKED ME

1. WHY YOU CHOOSE BIO TECH BRANCH?

2. WHY SHOULD I SELECT YOU?

3. HOW YOU ARE BENEFITIAL FOR US?

4. DO YOU HAVE ANY QUESTIONS FOR US?

YOU MUST ASK A GOOD QUESTION OTHERWISE IT WILL

CREATE A VERY NEGATIVE IMPRESSION OF YOU IN FRONT OF THEM. SO MANY PERSONS WHO DIDN’T ASK QUESTIONS WERE REJECTED.

M.R ROUND

THIS IS A COMBINATION OF H.R AND TECHNICAL TYPE THEY CAN ASK YOU ANYTHING.

THE QUESTIONS THAT THEY ASKED ARE FOLLOWING

1. INTRODUCE YOURSELF?

2. WHY BIO TECH BRANCH?

3. WHAT IS THE DIFFERENCE BETWEEN C AND C++?

4. DO YOU HAVE ANY QUESTION FOR US?

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