Question Discussion & Solution

The correct answer is OMR.

Important Points

• Optical mark recognition
  • It is the input device used to scan a marked answer book of a multiple choice question paper.
  • An optical answer sheet or bubble sheet is a special type of form used in multiple-choice question examinations. 
  • Optical mark recognition is used to detect answers.

Additional Information

• OCR
  • ​OCR (Optical Character Recognition) recognizes all the characters from the paper document.
  • It collects and stores them into an editable document.
• ​MICR
  • ​The term magnetic ink character recognition (MICR) refers to the line of numbers that appears at the bottom of a check.
  • The MICR line is a group of three numbers, which are the check number, account number, and bank routing number.
• Card reader
  • A card reader is a data input device that reads data from a card-shaped storage medium.

Jail must have Lock other options are not necessary part of jail. There can be or cannot be prisoner in jail. Rods are not necessary jail can be a room even Jailor is not always necessary.

The correct answer is Sunderban Delta.

• Sunderban Delta is the largest delta in India.

Key Points

• Sunderbans has spread over 1330.10 sq. km.
• It is formed by the Ganga and Brahmaputra rivers in West Bengal and Bangladesh. 
• Sundarbans is also known for the mangrove forest which is one of the largest such forests in the world.
• Sundarbans was included in the World Heritage site in 1987.
• East Flowing Rivers are known as Delta forming rivers
  • East flowing rivers do not form estuaries.
  • East flowing rivers fall in the Bay of Bengal.

Additional Information

• A delta is a depositional feature of a river which is formed at the mouth of the river. 
• Largest River without is Delta Narmada and Tapti.

Important functions of a database administrator are:

• Schema definition schema and physical organization modification granting of authorization for data access
• Monitoring jobs running on the database and ensuring that performance is not degraded by very expensive tasks submitted by some users.
• Routine maintenance includes activities like periodic ensuring that backup and enough freedisk space is available for normal operations and upgrading disk space as required.

Key Points Doubly linked list:
A doubly linked list is a linked data structure that consists of a set of sequentially linked records called nodes. Each node contains three fields: two link fields and one data field.
Binary tree:
A binary tree is a tree data structure in which each node has at most two children, which are referred to as the left child and the right child.

Linked list:

A linked list is a linear collection of data elements whose order is not given by their physical placement in memory. Instead, each element points to the next. It is a data structure consisting of a collection of nodes that together represent a sequence.

Queue:

A queue is a collection of entities that are maintained in a sequence and can be modified by the addition of entities at one end of the sequence and the removal of entities from the other end of the sequence.

A Doubly linked list is the efficient data structure to insert/delete a number in a stored set of numbers.

Hence the correct answer is the Doubly linked list.