To which command the ALU of computer responds?
Answer: B
Correct answer: Command coming from control section
The ALU does nothing on its own: it performs an operation when the control unit selects it and enables the registers holding the operands. Memory supplies data, not commands.
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A compiler is used when data is to be processed in
Answer: A
Correct answer: batches
A compiler translates the whole program first and then it is run, which suits a job submitted with all its data and left to complete. Interactive working, where each statement is to take effect at once, calls for an interpreter instead.
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Control returns in calling program at correct place exactly from
Answer: A
Correct answer: place it lefts
A subroutine call saves the return address before transferring control, so when the subroutine finishes, execution resumes at the statement immediately after the call. Returning to the start or the end of the program would lose the work in progress.
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In line "750 INPUT NUM: PRINT 7.3*NUM*NUM+15" of a BASIC program, '7.3*NUM*NUM+15' is
Answer: B
Correct answer: an expression
7.3*NUM*NUM+15 combines constants, a variable and operators to produce a value, which is what an expression is. An exponent is a single power and an identifier is a name.
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Which language can be directly understood by the CPU?
Answer: A
Correct answer: Machine language
Only machine language - binary instructions in the processor's own instruction set - can be executed directly. Assembly, C and Java all need a translator: an assembler, a compiler, or a compiler and a virtual machine respectively.
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In programming language BASIC, area is calculated as
Answer: C
Correct answer: 100 Area=Width*Length
A BASIC statement begins with its line number, and assignment uses a plain equals sign: 100 Area=Width*Length. The := of the other options belongs to Pascal, and a statement without a line number would not be stored in the program.
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High level language is also called
Answer: D
Correct answer: All of the above
All three names describe high level languages from different angles: they are problem oriented rather than machine oriented, and particular ones are aimed at business or at mathematical work. The common feature is that the programmer writes in the terms of the problem.
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Programming language 'COBOL' stands for
Answer: D
Correct answer: common business orientated language
COBOL is the acronym of COmmon Business Oriented Language. It is a language, not a learning, and the word is business, not binary.
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How is the instructions and memory address represented?
Answer: C
Correct answer: By binary codes
Everything inside the machine is held as patterns of bits, so both the operation to be performed and the address it refers to are represented by binary codes. A parity bit checks for error and a character code represents text, neither of which is what an instruction is made of.
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_________________is not used as main memory system.
Answer: A
Correct answer: Magnetic tape
Main memory must be randomly accessible, and tape is a sequential medium: reaching a given record means winding through everything before it. Magnetic core and semiconductor memory were both used as main memory, in the second and third generations respectively.
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