ROM is -
Answer: B
ROM is non-volatile.
Its contents survive when power is removed, which is why the firmware that starts a computer is held in it. RAM is volatile and loses everything the moment power is cut.
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Once the active medium is excited, by which physical process is the first photons of light are produced ?
Answer: B
The first photons in a laser are produced by spontaneous emission.
An excited atom drops to a lower level of its own accord and emits a photon in a random direction. A few of those photons happen to travel along the axis, and they set off the stimulated emission that builds the beam.
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What program runs first after computer is booted and loading GUI?
Answer: D
Authentication runs first once the GUI has loaded.
The logon process presents the sign-in screen and verifies the credentials before the user's desktop, shell and startup programs are launched, so that everything afterwards runs in that user's security context.
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Main circuit board in a computer is...
Answer: D
The main circuit board in a computer is the motherboard.
It carries the processor socket, memory slots, chipset, expansion slots and connectors, and the buses that link them, so every other component plugs into or communicates through it.
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Which among following organization is concerned with databases ?
Answer: D
Oracle is the organisation concerned with databases.
Its relational database, released in 1979, was the first commercial implementation of Codd's model and remains dominant in large enterprises. Asus, Intel and Motorola are hardware makers.
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Which kind of files have .mpg extension ?
Answer: C
Files with the .mpg extension are video files.
MPEG defines the compression standards for moving pictures: MPEG-1 for the Video CD, MPEG-2 for DVD and digital broadcasting, MPEG-4 for most streaming.
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The frequency range which is called High Frequency band is?
Answer: D
The High Frequency band runs from 3 to 30 MHz.
HF waves are reflected by the ionosphere, so they can travel thousands of kilometres by skywave, which is why short-wave broadcasting, amateur radio and long-range aviation use the band.
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In a Digital circuit, what is 1 'AND' 1?
Answer: B
In digital logic, 1 AND 1 = 1.
An AND gate outputs 1 only when every input is 1; any 0 gives 0. It corresponds to the logical 'both', and with OR and NOT it can build any logic function at all.
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What is the meaning of OSI, in terms of computers ?
Answer: C
OSI stands for Open Systems Interconnection.
The OSI reference model divides networking into seven layers, from physical up to application. It is used as a teaching and design framework, though the internet actually runs on the simpler TCP/IP model.
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Who is also known as father of Jquery ?
Answer: B
John Resig created jQuery, releasing it in 2006.
It smoothed over the differences between browsers and made DOM manipulation, event handling and AJAX far simpler. At its height it was used on a majority of the world's websites.
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