What is the average power (in watts) used by a 20 to 25 inch home color television...?
Answer: A
A 20 to 25 inch colour television draws about 70 to 100 watts.
Most of it goes to the electron gun and the deflection circuits. A modern LED set of the same size uses a fraction of that.
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What do we call a network whose elements may be separated by some distance? It usually involves two or more small networks and dedicated high-speed telephone lines.
Answer: C
A network whose parts may be separated by great distances is a wide area network.
A WAN links two or more local networks over leased lines, microwave or satellite. The internet is the largest WAN of all.
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The operation is specified by a binary code known as the -
Answer: D
The operation in an instruction is specified by the opcode.
The operation code says what to do - add, load, jump - and the rest of the instruction says what to do it to. The number of bits in the opcode limits how many distinct instructions the processor can have.
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In which condition resource is not removed from a process holding ?
Answer: D
Under non-preemption a resource cannot be taken from a process holding it.
It is one of the four Coffman conditions for deadlock, with mutual exclusion, hold and wait, and circular wait. All four must hold at once for deadlock, so breaking any one prevents it.
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Optical fibre transmits light using the principle of ________.
Answer: A
Correct answer: total internal reflection
The core has a higher refractive index than the cladding, so light striking the boundary beyond the critical angle is reflected entirely back into the core. Repeating this along the length carries the signal with very little loss.
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Which technology is used in a compact disc to read the stored data ?
Answer: A
Correct answer: A laser beam
A CD drive shines a laser at the disc and detects the change in reflection at the edges of microscopic pits. Because nothing touches the surface, the disc does not wear with repeated reading, unlike magnetic tape.
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What will a UPS be used for in a building?
Answer: A
A UPS provides power to essential equipment when the mains fails.
An uninterruptible power supply holds a battery and an inverter, and switches over within milliseconds, so servers and medical equipment keep running long enough to be shut down safely or for a generator to start.
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'.BAK' extension refers usually to what kind of file?
Answer: A
A .BAK file is a backup file.
Many programs rename the previous version of a document to .BAK before saving the new one, so that the last good copy survives a crash or a mistaken edit.
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One million bytes-
Answer: D
One million bytes is about 1 MB.
Strictly a megabyte is \( 2^{20} = 1{,}048{,}576 \) bytes, since memory is addressed in powers of two. Disk manufacturers use the decimal million, which is why capacities appear smaller once formatted.
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What can be considered as basic building blocks of a digital circuit ?
Answer: C
The logic gate is the basic building block of a digital circuit.
AND, OR and NOT gates, built from transistors, can be combined to make any logical function, and from them come adders, multiplexers, flip-flops and eventually the whole processor.
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