Which of following is used to create table ?
Answer: D
Correct answer: DDL
DDL - the Data Definition Language part of SQL - defines the structure of the database, with CREATE, ALTER and DROP. DML manipulates the rows inside those tables (INSERT, UPDATE, DELETE) and DCL controls privileges (GRANT, REVOKE).
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Binary number system consists of ?
Answer: C
Correct answer: 0’s and 1’s only
The binary system has base 2, so it uses exactly two digits, 0 and 1. Everything a computer stores - numbers, text, images, instructions - is a pattern of those two, because each is easily represented by a circuit that is either off or on.
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An optical input device that interprets pencil marks on paper media is
Answer: A
Correct answer: O.M.R
Optical mark recognition shines light on a form and detects where the reflectance is reduced by a pencil mark, so the position of each filled bubble is read as an answer. It is how examination answer sheets and ballot forms are counted, and it reads marks rather than shapes, which is what distinguishes it from OCR.
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Which method is used to connect a remote computer?
Answer: B
Correct answer: Dialup
A dial-up connection reaches a distant machine by having a modem place an ordinary telephone call to a modem at the other end; once the two have negotiated, the line carries data. It is the classic way of connecting a remote computer over the public network.
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The LRU algorithm
Answer: C
Correct answer: pages out pages that have been least used recently
LRU - least recently used - evicts the page that has gone longest without being referenced, on the assumption that a page untouched for a long time is the least likely to be needed next. It approximates the optimal policy well, but tracking the order of use exactly is expensive, so it is usually approximated with reference bits.
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Which type of software are device drivers
Answer: B
Correct answer: System software
A device driver is system software: it works between the operating system and a piece of hardware, turning general read and write requests into the particular commands that model understands. It serves the machine rather than the user, which is what separates system software from applications.
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Which is a type of ROM
Answer: D
Correct answer: All of above
All three are read-only memories that differ in how they are written. PROM is programmed once by blowing fusible links; EPROM can be erased by ultraviolet light through a window in the package and reprogrammed; EEPROM is erased electrically, byte by byte, without removing the chip.
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