Data Determinaton(Computer Aptitude ) Questions and Answers

Question 1.

Data representation in a computer uses the number system

  1.    Decimal
  2.    Number
  3.    Binary 
  4.    integers 
  5.    None of these
Explanation:-
Answer: Option C. -> Binary 

Question 2.

The basic architecture of computer was developed by

  1.    John Von Neumann
  2.    Charles Babbage
  3.    Blaise Pascal
  4.    Gorden Moore
  5.    None of these
Explanation:-
Answer: Option A. -> John Von Neumann

Question 3.

1 megabyte (MB) equal to

  1.    220 bytes
  2.    1 kilo KB
  3.    1’ and ‘2’
  4.    1024 kilobytes
  5.    None of these
Explanation:-
Answer: Option D. -> 1024 kilobytes

Question 4.

1 kilobyte (KB) is equal to

  1.    10 bits
  2.    1024 bits
  3.    1020 bits
  4.    1030 bits
  5.    1000 bits
Explanation:-
Answer: Option B. -> 1024 bits

Question 5.

The result of the subtraction (1011)2 - (0010)2 is

  1.    0001
  2.    1001
  3.    1011
  4.    1111
  5.    1000
Explanation:-
Answer: Option B. -> 1001

Question 6.

The binary equivalent of decimal number 98 is

  1.    1110001
  2.    1110100
  3.    110001
  4.    1111001
  5.    1100010  
Explanation:-
Answer: Option E. -> 1100010  

Question 7.

The product of two binary numbers (1011) and (1001) is

  1.    11000
  2.    1010100
  3.    000100
  4.    100100
  5.    1100011
Explanation:-
Answer: Option E. -> 1100011

Question 8.

A byte represents a group of

  1.    10 bits
  2.    40 bits
  3.    8 bits
  4.    22 bits
  5.    25 bits
Explanation:-
Answer: Option C. -> 8 bits

Question 9.

A(n) hexadigit can be represented by

  1.    three binary (consecutive) bits
  2.    four binary (consecutive) bits
  3.    eight binary (consecutive) bits
  4.    All of the above
  5.    None of the above
Explanation:-
Answer: Option B. -> four binary (consecutive) bits
A hexadigit is a base-16 number system which consists of 16 digits from 0 to 15 and each hexadigit is represented by four binary (consecutive) bits. A binary number is a base-2 number system which consists of two digits, 0 and 1. Thus, four binary bits can represent a single hexadigit.

Definitions:
Hexadigit: A hexadigit is a base-16 number system which consists of 16 digits from 0 to 15.
Binary: Binary is a base-2 number system which consists of two digits, 0 and 1.

Formula:
Hexadigit = 4 binary bits

Explanation with Examples:
For example, the hexadecimal digitA is represented as 1010 in binary number system. Here, each hexadecimal digit is represented as four binary bits. Thus, four binary bits can represent a single hexadigit.

Similarly, we can represent other hexadecimal digits using four binary bits.

Hexadecimal Digits Binary Representation
A 1010
B 1011
C 1100
D 1101
E 1110
F 1111

Thus, we can say that a hexadigit can be represented by four binary (consecutive) bits. Therefore, option B is the correct answer.

Question 10.

When a key is pressed on the keyboard, which standard is used in converting the keystroke into the corresponding bits?

  1.    ANSI
  2.    ASCII
  3.    EBCDIC
  4.    ISO
  5.    None of these
Explanation:-
Answer: Option B. -> ASCII