大学计算机导论练习题及答案

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考题练习
• If a computer can execute 2× 109 instructions per second, what is the computer’s performance in MFLOPS? [1] 20 [2] 2000 [3] 2000000 [4] 200000000 • The time unit, 400 x 10-10 seconds, is equivalent to . [1] 40 nanoseconds [2] 4000 miniseconds [3] 400 microseconds [4] 4 bitseconds • The disk size is 100 x 240 bytes that is equivalent to 100 . [1] KiloBytes (KB) [2] MegaBytes (MB) [3] GigaBytes (GB) [4] TeraBytes (TB) • A _________ is the method or technique that improves the efficiency of a search process, possibly by sacrificing optimality. [1] Turing test [2] Ad-hoc [3] Trade off [4] Heuristics
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Lec. 2 Number Systems
考题练习
• • • Which of the following representation is erroneous? [1] (1001001)2 [2] (765)8 [3] (ING)16 [4] 1001001 The decimal fraction, 0.15625, is equal to: [1] 2 -1 + 2 -2 [2] 2 -2 + 2 -4 [3] 2 3 + 2 5 [4] 2 -3 + 2 -5 The decimal fraction, 0.515625, is equal to: [1] 2 -1 + 2 -2 [2] 2 -2 + 2 -4 [3] 2 -1 + 2 -6 [4] 2 -1 + 2 -5 Which of the following representation is erroneous? [1] (1001001) 2 [2] (789) 8 [3] (FCF) 16 [4] 1001001 The base of the hexadecimal number systems is ____? [1] 2 [2] 8 [3] 10 [4] 16 The octal system is a positional number system that uses __8_symbols to represent a number.
Lec. 1 -5
考题练习 解答
Lec. 1 Introduction
• The idea of a universal computational device was first described by a mathematician in 1937. The mathematician proposed that all computation could be performed by a special kind of a machine, now called _Turing___ machine.
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• Instructions native to the central processor of a computer that are executable without assembly or compilation are called H . • The component of a CPU that interprets the instructions and controls the flow of data is called _C_. • A universal N_, that can do any computation if the appropriate program is provided, was the first description of a modern computer. • The invention of _P_ reduced the cost and size of computers in the fourth generation.
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ቤተ መጻሕፍቲ ባይዱ
考题练习
• Which one of the following operations is not belong to input/output subsystem in a computer? [1] Accept data [2] Accept programs [3] Manage the other subsystem [4] Send the results to output devices Which one is not included in the sequential execution of instructions by the control unit of the von Neumann? [1] Fetch [2] Decode [3] Compile [4] Execute The logical steps necessary to solve a problem with a computer is called an algorithm . The most important software in a computer that controls the computing environment and provides an interface to the user is called operating system .
考题练习
• Which one of the following operations is not belong to input/output subsystem in a computer? [1] Accept data [2] Accept programs [3] Manage the other subsystem [4] Send the results to output devices • Which one is not included in the sequential execution of instructions by the control unit of the von Neumann? [1] Fetch [2] Decode [3] Compile [4] Execute • In the von Neumann model, _memory__ subsystem stores data and programs.
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考题练习
• Which of the number in octal is equal to the number 3075 in decimal? [1] 6001 [2]6003 [3] 5001 [4] 5003 • We repeatedly ___ by b to convert a decimal fraction to base b. [1] Divide [2] Multiply [3] Neither a nor b [4] Both a and b • Which of the number in binary is equal to the number 30.625 in decimal? [1] 11110.101 [2] 11110.011 [3] 11110.111 [4] 11111.111 • Which of the number in binary is equal to the number 30.375 in decimal? [1] 11110.101 [2] 11110.011 [3] 11110.111 [4] 11111.111
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考题练习
• Convert the number (1A.2)16 in hexadecimal into the number in decimal: _26.125_. • Convert the number 11A in hexadecimal into the number in decimal: _282___.
• A universal _ Turing Machine ____, that can do any computation if the appropriate program is provided, was the first description of a modern computer.
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考题练习
FORTRAN and COBOL are examples of . [1] Software [2] Hardware [3] Architecture [4] Computer Languages • • • The most important software in a computer, called operating system , is originally worked as a manager to facilitate access to the computer’s components by a program. A step-by-step solution to a problem is called an algorithm _. ______is the design and writing of a program in structured form. [1] Software Engineering [2] Hardware Engineering [3] Algorithm Development [4] Instructional Architecture The most important software in a computer that controls the computing environment and provides an interface to the user is called operating system _