Computer Questions for NICL AO Mains for 2019


______ is a set of keywords, symbols and a system of rules for constructing statements by which human can communicate the instructions to be executed by a computer. 

   A.) A computer program 
   B.) A programming language 
   C.) An assemble 
   D.) Computer I/O Device

Answer: Option 'B'

A programming language is a formal computer language or constructed language designed to communicate instructions to a machine, particularly a computer. Programming languages can be used to create programs to control the behaviour of a machine or to express algorithms.


A computer uses which number system to store data and perform calculations? 

   A.) Binary 
   B.) Decimal 
   C.) Octal 
   D.) Hexadecimal 

Answer: Option 'A'

Computer uses binary number system.


Which one of the following is a set of one or more attributes taken collectively to uniquely identify a record?

   A.) Substitute Key
   B.) Sub key
   C.) Super key
   D.) Foreign key

Answer: Option 'C'

Super key is a set of one or more attributes taken collectively to uniquely identify a record.


Which of the following conditions is responsible for occurrence of context switching?

   A.) When one process expires and a new one is loaded from a ready queue
   B.) No processes are in the ready queue
   C.) When a process is running
   D.) When the CPU is at rest

Answer: Option 'A'

A context switching comes into the picture when the time period provided for one process is over and a new process is loaded from the ready queue for processing.


Which type of virus is generally scripted into common application programs like Excel and Word to infect the other documents and spreads to the other parts when the application is running?

   A.) Macro Viruses
   B.) File infector virus
   C.) Resident Viruses
   D.) Boot virus

Answer: Option 'A'

A macro virus is a computer virus that "infects" a Microsoft Word or similar application and causes a sequence of actions to be performed automatically when the application is started or something else triggers it.

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