QUES AND ANS

Sample C Programming Questions & Answers:

1. Comment on the output of following code:

1.     #include <stdio.h>

2.     main()

3.     {

4.         char *p = 0;

5.         *p = 'a';

6.         printf("value in pointer p is %c\n", *p);

7.     }

a) It will print a
b) It will print 0
c) Compile time error
d) Run time error
View Answer

Answer:d
Output:
$ cc pgm.c
$ a.out
Segmentation fault (core dumped)

2. What is the output of this C code?

1.    #include <stdio.h>

2.    main()

3.    {

4.        if (sizeof(int) > -1)

5.            printf("True");

6.        else

7.            printf("False");

8.    }

a) True
b) False
View Answer

Answer:b
Output:
$ cc pgm.c
$ a.out
False

3. What is the output of this C code?

1.     #include <stdio.h>

2.     main()

3.     {

4.         char *p = "Sanfoundry C-Test";

5.         p[0] = 'a';

6.         p[1] = 'b';

7.         printf("%s", p);

8.     }

a) abnfoundry C-Test
b) Sanfoundry C-Test
c) Compile time error
d) Run time error
View Answer

Answer:d
Output:
$ cc pgm.c
$ a.out
Segmentation fault (core dumped)

4. What is the output of this C code?

1.     #include <stdio.h>

2.     int main()

3.     {

4.         float f = 0.1;

5.         if (f == 0.1)

6.             printf("True");

7.         else

8.             printf("False");

9.     }

a) True
b) False
View Answer

Answer:a
Output:
$ cc pgm.c
$ a.out
False

5. What is the output of this C code?

1.     #include <stdio.h>

2.     main()

3.     {

4.         int n = 0, m = 0;

5.         if (n > 0)

6.             if (m > 0)

7.                 printf("True");

8.         else 

9.             printf("False");

10.     }

a) True
b) False
c) No Output will be printed
d) Run Time Error
View Answer

Answer:c
Output:
$ cc pgm.c
$ a.out
$

  COMPUTER  GK QUESTION 

1. Pipelining strategy is called implement

instruction execution

instruction prefetch

instruction decoding

instruction manipulation

ANSWER : instruction prefetch

2. In MS-DOS you can use small or capital letter of combination of both to enter a command but internally MS-DOS work with.

Small letter

Capital letter

Both a and b

None of above

ANSWER : Capital letter

3. Terminals are required for

eal-time, batch processing & time-sharing

eal time, time-sharing & distributed message processing

eal time, distributed processing & manager inquiry

eal-time, time sharing & message switching

ANSWER : real-time, time sharing & message switching

4. To copy the file command.com from drive c: to drive a:

Drive c: copy drive a:\command.com

C:A: copy command.com

Copy c:\command.com a:

Both b and c

ANSWER : Copy c:\command.com a:

5. Electronic spreadsheets are most useful in a situation where relatively .... data must be input but ...... calculations are requied.

little; simple

large; simple

large; complex

little; complex

ANSWER : little; complex

6. A collection of 8 bits is called

byte

word

record

All of above

ANSWER : byte

7. Which of the following is not one of the process that a high level language program msut go through before it is ready to be executed?

translation

controlling

lading

linking

ANSWER : translation

8. While working with Ms-Dos which command transfers a specific file from one disk to another?

Copy

Diskcopy

Time

Rename

ANSWER : Copy 9. The vol command is used to  see the value of list  see the veriety of language  see the disk volume label  see the volume of largest ANSWER : see the disk volume label 10. Disk copy command in DOS is used to  Copy a file  Copy contents of one floppy disk to another  Copy contents of CD-ROM to another  All of the above ANSWER : Copy contents of one floppy disk to another 11. All computers execute  BASIC programs  COBOL programs  Machine language program  FORTRAN programs ANSWER : Machine language program 12. Interrupts which are initiated by an instruction are  internal  external  hardware  software ANSWER : external 13. The branch logic that provides decision making capabilities in the control unit is known as  controlled transfer  conditional transfer  unconditional transfer  none of above ANSWER : unconditional transfer 14. Processors of all computers, whether micro, mini or mainframe must have  ALU  Primary Storage  Control unit  All of above ANSWER : All of above 15. An example of digital, rather than analog, communication is DD DS ATS DT 16. External command in DOS are  Copy, edit, sys, format  Edit, sys, chkdsk  Chkdsk, prompt, date  Sys, ver, vol ANSWER : Edit, sys, chkdsk 17. Pipeline implement  fetch instruction  decode instruction  fetch operand  all of abve ANSWER : all of abve 18. The ALU and control unit of most of the microcomputers are combined and manufacture on a single silicon chip. What is it called?  monochip  microprocessor  ALU  control unit ANSWER : microprocessor 19. What is the control unit's function in the CPU?  To transfer data to primary storage  to store program instruction  to perform logic operations  to decode program instruction ANSWER : to decode program instruction 20. Which of the following performs modulation and demodulation?  fiber optics  satellite  coaxial cable  modem ANSWER : modem 21. Which of hte following is considered a broad band communication channel?  coaxial cable  fiber optics cable  microwave circuits  all of above ANSWER : all of above 22. The interactive transmission of data within a time sharing system may be best suited to  simplex lines  half-duplex lines  full duplex lines  biflex-lines ANSWER : half-duplex lines 23. Which of the following is most oriented to scientific programming?  FORTRAN  COBOL  BASIC  PL/1 ANSWER : FORTRAN 24. To copy the hidden system files of DOS to another disk you can use the command  Copy  Ren  Sys  Diskcopy ANSWER : Sys 25. In BASIC, description comments are put in the source program with the  PRINT statement  REMARK statement  INPUT statement  DATA statement ANSWER : REMARK statement 26. Which command is used to display all the files having the (.exe) extension but different filename?  Dir filename.*  Dir filename.ext  Dir *.sys  Dir *.ext ANSWER : Dir *.ext 27. CHKDSK command is used to  Analyze the hard disk error  Diagnose the hard disk error  Report the status of files on disk  All of the above ANSWER : All of the above 28. In which year the first operating system was developed  1910  1940  1950  1980 ANSWER : 1950 29. Which command should be used to display all files within the specified subordinate directory of the subdirectory?  Dir \ pathname  Dir \ pathname\pathname  Dir / ch  Dir \pathname\filename ANSWER : Dir \pathname\pathname 30. In communication satellite, multiple repeaters are known as  detector  modulator  stations  transponders ANSWER : transponders 31. Which of the following is an advantage to using fiber optics data transmission?  resistance to data theft  fast data transmission rate  low noise level  all of above ANSWER : all of above 32. The channel in the data communication model can be ostal mail services elephone lines adio lines ny of the above ANSWER : any of the above 33. Which of the following statement is incorrect?  Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line  HDLC is a standard synchronous communication protocol.  RTS/CTS is the way the DTE indicates that it is ready to transmit data and the way the DCW indicates that it is ready to accept data  RTS/CTS is the way the terminal indicates ringing ANSWER : RTS/CTS is the way the terminal indicates ringing 34. The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as:  modulation  demodulation  synchronizing  digitizing ANSWER : digitising 35. In OSI network architecture, the dialogue control and token management are responsibility of  session layer  network layer  transport layer  data link layer ANSWER : session layer 36. Which of the following types of channels moves data relatively slowly?  wide band channel  voice band challen  narrow band channel  none of above ANSWER : narrow band channel 37. Which file organization is allowed by a direct access storage device?  direct only  sequential and direct only  indexed and direct only  sequential, indexed and direct ANSWER : sequential, indexed and direct 38. If you need to duplicate the entire disk, which command will you use?  Copy  Diskcopy  Chkdsk  Format ANSWER : Diskcopy 39. A data terminal serves as an ffector ensor oth a and b either a nor b ANSWER : both a and b 40. Which command displays the directory list including files in tree structure?  Dir/s/f  Tree/f  Tree/s/f  Dir/f ANSWER : Tree/f 41. A complete microcomputer system consists of  microprocessor  memory  peripheral equipment  all of above ANSWER : all of above 42. Which of the following code is used in present day computing was developed by IBM corporation?  ASCII  Hollerith Code  Baudot code  EBCDIC code ANSWER : EBCDIC code 43. All of the following are divisions of the COBOL program except:  input-output  indentification  procedure  data ANSWER : input-output 44. Which command be used to clear the screen and display the operating system prompt on the first line of the display?  Cd  Md  Rename  cls ANSWER : cls 45. Avalanche photodiode receivers can detect bits of transmitted data by receiving  100 photons  200 photons  2000 photons  300 photons ANSWER : 200 photons 46. MS-DOS developed in  1991  1984  1971  1961 ANSWER : 1984 47. The synchronous modems are more costly than the asynchronous modems because  they produce large volume of data  they contain clock recovery circuits  they transmit the data with stop and start bits  they operate with a larger bandwidth ANSWER : they contain clock recovery circuits 48. Which command is used to make a new directory?  Md  Cd  Rd  None of above 56. What is the main difference between DDCMP and SDLC? DCMP does not need special hardware to final the beginning of a message DCMP has a message header DLC has a IP address DLC does not use CRC ANSWER : DDCMP does not need special hardware to final the beginning of a message 55. One disadvantage of a direct access file is:  the delay in computiong the storage address  duplication of address locations  unsued, but available, storage locations  all of above ANSWER : the delay in computiong the storage address 54. CHKDSK can be used to find  Disk’s bad portion  Occupied space  Free space  All of above ANSWER : All of above ANSWER : Md 49. Which of the following communications lines is best suited to interactive processing applications?  narrow band channel  simplex lines  full duplex lines  mixed band channels ANSWER : full duplex lines 50. In a synchronous modem, the receive equilizer is known as daptive equilizer mpariment equilizer tatistical equilizer ompromise equilizer ANSWER : adaptive equilizer 51. Maximum length of DOS command using any optional parameter is  26 characters  87 characters  127 characters  None of above ANSWER : 127 characters 52. xcopy command can copy  individual files or group of files  directories including subdirectories  to diskette of a different capacity  all of above ANSWER : all of above 53. What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?  4  2  6  3 ANSWER : 3 54. CHKDSK can be used to find  Disk’s bad portion  Occupied space  Free space  All of above ANSWER : All of above 55. One disadvantage of a direct access file is:  the delay in computiong the storage address  duplication of address locations  unsued, but available, storage locations  all of above ANSWER : the delay in computiong the storage address 56. What is the main difference between DDCMP and SDLC? DCMP does not need special hardware to final the beginning of a message DCMP has a message header DLC has a IP address DLC does not use CRC ANSWER : DDCMP does not need special hardware to final the beginning of a message More Computer Basics GENERAL KNOWLEDGE QUESTIONS AND ANSWERS available in next pages