21. What is the file extension of the common functions that a programmer can access to reduce repetitive coding?

1. 1. .DRV

   
   
   

   2. .EXE

   
   
   

   3. .DLL

   
   
   

   4. .TMP

   
   
   

   5. .SYS

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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22. In what year was MS-DOSv1 first introduced?

1. 1. 1979

   
   
   

   2. 1980

   
   
   

   3. 1981

   
   
   

   4. 1982

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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23. What is the interface between an OS and Application program called?
    

1. 1. .DLL

   
   
   

   2. .SYS

   
   
   

   3. API

   
   
   

   4. .EXE

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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24. How many bits is the DOS operating environment?

1. 1. 4

   
   
   

   2. 8

   
   
   

   3. 16

   
   
   

   4. 32

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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25. A binary digit has two possible states and can be shown in a number of ways. Which of the following is not a valid description of a bit?
    

1. 1. Black or White

   
   
   

   2. 0 or 1

   
   
   

   3. True of False

   
   
   

   4. On or Off

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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