Operating System Questions

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451.

The table created by lexical analysis to describe all literals used in the source program is

A

Terminal table

B

Literal table

C

Identifier table

D

Reductions

E

None of the above

Correct Answer: B

The table created by lexical analysis to describe all literals used in the source program is Literal table.

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452.

The term 'polling' in a computer means a process by which a computer system

A

detects/corrects errors

B

multiplexes the inputs and updates the memory accordingly

C

decides correct alternative by analysing several ones

D

inquires to see if a terminal has any transaction to send

E

None of the above

Correct Answer: D

None.

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453.

In which addressing mode, the address of the location of the operand is given explicitly as a part of the instruction.

A

absolute mode

B

immediate mode

C

index mode

D

modulus mode

E

None of the above

Correct Answer: A

None.

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454.

Under virtual storage,

A

a single program is processed by two or more CPUs

B

two or more programs are stored concurrently in primary storage

C

only the active pages of a program are stored in primary storage

D

interprogram interference may occur

E

None of the above

Correct Answer: C

Under virtual storage only the active pages of a program are stored in primary storage.

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455.

A base register table

A

allows the programmer to write base registers and displacements explicitly in the source program.

B

is used to remember which of the general-purpose registers are currently available as base registers, and what base addresses they contain.

C

allows multiple programs to reside in separate areas of core at the same time.

D

is a term that refers to the control programs of an operating system.

E

None of the above

Correct Answer: B

A base register table is used to remember which of the general-purpose registers are currently available as base registers, and what base addresses they contain.

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456.

File record length

A

should always be fixed

B

Should always be variable

C

depends upon the size of the file

D

should be chosen to match the data characteristics

E

None of the above

Correct Answer: D

File record length should be chosen to match the data characteristics.

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457.

A relationship between processes such that each has some part (critical section) which must not be executed while the critical section of another is being executed, is known as

A

semaphore

B

mutual exclusion

C

multiprogramming

D

multitasking

E

None of the above

Correct Answer: B

A relationship between processes such that each has some part (critical section) which must not be executed while the critical section of another is being executed, is known as mutual exclusion

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458.

What is the name of the operating system which was originally designed by scientists and engineers for use by scientists and engineers?

A

XENIX

B

UNIX

C

OS/2

D

MS DOS

E

None of the above

Correct Answer: B

None.

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459.

The most common security failure is

A

carelessness by users

B

depending on passwords

C

too much emphasis on preventing physical access

D

insufficient technology used to prevent breaches

E

None of the above

Correct Answer: A

None.

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460.

Terminal Table

A

contains all constants in the program

B

a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure.

C

consists of a full or partial list of the token's as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation

D

a permanent table which lists all key words and special symbols of the language in symbolic form.

E

None of the above

Correct Answer: D

None.

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