Computer Codes Questions

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1.

What is Unicode?

A

Represents symbol or characters used in any langua

B

Only few languages are supported

C

Supports only few characters

D

Characters from A to Z

Correct Answer: A

None.

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2.

A family of polynomial block codes designed to correct burst errors is known as

A

Bar Codes

B

Gray Codes

C

Fire Codes

D

Mnemonics Codes

E

None of these

Correct Answer: C

None.

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3.

The computer code for interchange of information between terminals is

A

BCDIC

B

BCD

C

ASCII

D

None of these

Correct Answer: C

None.

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4.

How many bit code is used by Murray code for TELEPRINTER machines.

A

4

B

5

C

9

D

25

E

None of the above

Correct Answer: B

5 bit code is used by Murray code for TELEPRINTER machines.

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5.

The most common binary code in use today is the 8 bit ASCII code. What do the letters ASCII stand for?

A

American Standard Code for International Interchange

B

American Standard Code for Information Interchange

C

American Standard Code for Intelligence Interchange

D

American Scientific Code for Information Interchange

E

None of the above

Correct Answer: B

ASCII to Extended ASCII characters (8-bit system) and ANSI Code: In the 1960s, a need for standardization led to ASCII, which is a 7-bit system. But later almost everything was done in an 8-bit system. With 7 bits, 128 numbers (0-127 in decimal notation) are available to code characters. A bit is a binary digit which can have either two values, on or off. Seven bits can have 2^7 or 128 possible unique values. ASCII was soon expanded to an 8-bit system that has 256 code points, 0-255 (8-bit corresponds to 2 ^ 8 ie. 256 possibilities). There are many variants of Extended ASCII characters (8-bit system) to cover regional characters and symbols. One example is the extended ASCII characters which includes various letters needed for writing languages of Western Europe and certain special characters. Source : wikipedia.org

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6.

The ASCII code for the character J is:

A

106

B

105

C

74

D

75

E

None of the above

Correct Answer: C

The ASCII code for the character J is 074. Letter ASCII Code Binary A 065 01000001 B 066 01000010 C 067 01000011 D 068 01000100 E 069 01000101 F 070 01000110 G 071 01000111 H 072 01001000 I 073 01001001 J 074 01001010 K 075 01001011 L 076 01001100 M 077 01001101 N 078 01001110 O 079 01001111 P 080 01010000 Q 081 01010001 R 082 01010010 S 083 01010011 T 084 01010100 U 085 01010101 V 086 01010110 W 087 01010111 X 088 01011000 Y 089 01011001 Z 090 01011010

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7.

EBCDIC can code up to how many different characters?

A

8

B

16

C

32

D

64

E

256

Correct Answer: E

EBCDIC (Extended Binary Coded Decimal Interchange Code ) is a binary code for alphabetic and numeric characters that IBM developed for its larger operating systems. It is the code for text files that is used in IBM's OS/390 operating system for its S/390 servers and that thousands of corporations use for their legacy applications and databases. In an EBCDIC file, each alphabetic or numeric character is represented with an 8-bit binary number (a string of eight 0's or 1's). 256 possible characters (letters of the alphabet, numerals, and special characters) are defined.

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8.

Computer instructions written with the use of English words instead of binary machine code is called

A

Mnemonics

B

Symbolic code

C

Gray code

D

Op-code

E

None of the above

Correct Answer: B

Computer instructions written with the use of English words instead of binary machine code is called Symbolic code

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9.

One byte can be used to encode any integer between 'O' and -inclusive

A

16

B

256

C

128

D

255

E

None of the above

Correct Answer: D

None.

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10.

The following is true about 2-out of-5 code:

A

it is weighted code

B

it is unweighted code

C

it has odd parity

D

All of the above

E

None of the above

Correct Answer: B

None.

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