Computer Aptitude Questions for IBPS Clerk Mains - 20th January 2019

11.

Decryption & Encryption of data are the responsibility of which layer.

   A.) Physical
   B.) Application
   C.) Presentation
   D.) Data Link

Answer: Option 'C'

Presentation layer is responsible for character-code translation, data conversion, data encryption and decryption, and data translation.

12.

Virtual memory allocates hard disk space to supplement the immediate, functional memory capacity of what?

   A.) ROM
   B.) EPROM
   C.) RAM
   D.) Extended memory

Answer: Option 'C'

Most operating Systems support virtual memory, which allocates space on the hard disk to supplement the immediate, functional memory capacity of RAM.

13.

Which of the following units performs the arithmetic tasks (such as addition, subtraction, multiplication and division) and logical operations?  

   A.) Input unit
   B.) Control unit
   C.) Arithmetic Logic Unit (ALU)
   D.) Storage unit

Answer: Option 'C'

Arithmetic Logic Unit (ALU) performs arithmetic and logical operations. On the other hand, control unit extracts instructions from the computer memory, decodes and executes instructions, and takes help of the ALU if required. Storage unit or memory unit is used to store the data, while the input is used to enter data into the computer.

14.

Which protocol is used to convert IP addresses to MAC addresses?

   A.) IP
   B.) RARP
   C.) In ARP
   D.) ARP

Answer: Option 'D'

The Address Resolution Protocol (ARP) feature performs a required function in IP routing. ARP finds the hardware address, also known as Media Access Control (MAC) address, of a host from its known IP address. ARP maintains a cache (table) in which MAC addresses are mapped to IP addresses.

15.

Term referring to a person who uses his or her expertise to gain access to other people’s computers to get information illegally or do damage?

   A.) hacker
   B.) instant messenger
   C.) analyst
   D.) spammer

Answer: Option 'A'

Hacker is someone who seeks and exploits weaknesses in a computer system.

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