Answer: B) Headphones Explanation: Here Joystick, Mouse and Scanner are Input devices through which data is given to the computers. But Headphones are output devices through which sound comes as an output from the computer or any devices.

Answer: B) File server Explanation:

1. MICR का पूर्ण रूप Magnetic Ink Character Recognition है। यह एक तकनीक है जिसका उपयोग चेकों और अन्य वित्तीय दस्तावेजों में जानकारी को पढ़ने के लिए किया जाता है।

2. MICR में अन्य प्रतीकों के अर्थ हैं।

- M: Magnetic Ink (मैग्नेटिक इंक)

- I: Ink (इंक)

- C: Character (चरित्र)

- R: Recognition (पहचान)

Answer: A) Dn = log 2 (n+1) Explanation: A complete binary tree is a binary tree where all the levels have maximum number of nodes except possibly the last level.   The depth of complete binary tree of n nodes will be Dn=log 2 (n+1) where Dn is the height or depth of the tree and n is the number of nodes.

Answer: C) Input, processing, output and storage Explanation: The four main functions of a computer are ::   1. Input, 2. Processing, 3. Output and 4. Storage

Answer: A) ICMP Explanation: ICMP means Internet Control Message Protocol and is always coupled with the IP protocol (There are 2 ICMP variants one for IPv4 and one for IPv6.) echo request and echo response are the two operation codes of ICMP used to implement ping.

Answer: C) Increase in font size Explanation: CTRL + ] is a computer shortcut and is used for Increase in font size.   Shortcuts : Re-do ---- Ctrl + Y Right align text ---- Ctrl + R Expand or collapse the ribbon ---- Ctrl + F1

Answer: A) print files on paper Explanation: A report generator is a computer program whose purpose is to take data from a source such as a database, XML stream or a spreadsheet, and use it to produce a document in a format which satisfies a particular human readership.   Hence, A report generator is used to print files on paper.