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41. To calculate perform calculation and store data computer user ………. number system.
A. Decimal
B. Hexadecimal
C. Octal
D. Binary
ANSWER:D
SOLUTION : The computers use the binary number system to store data and perform calculations.
42. How many choices are there in binary choice?
A. One
B. Two
C. It depends upon the amount of memory in a computer.
D. It depends upon the speed of the processor of a computer.
ANSWER: B
SOLUTION:A binary choice has two options. A binary decision is a choice between two alternatives, such as taking a specific action or not taking it.
43. …….. shows off’ state of current in binary code.
A. 1
B. 0
C. 3
D. 2
ANSWER:B
SOLUTION:In binary number system 0 represents off state and 1 represents on state.
44. What is logic gate?
A. A software
B. A type of circuit
C. A special Cd
D. A computer games
ANSWER:B
SOLUTION:A type of circuit
45. A hexadecimal number is represented by_________.
A. Three digits
B. Four binary digits
C. Four digits
D. All of these
ANSWER:C
SOLUTION:The word “Hexadecimal” means sixteen because this type of digital numbering system uses 16 different digits from 0-to-9, and A-to-F. Hexadecimal Numbers group binary numbers into sets of four digits.
46. Which of the following statements is true?
A. 1 gigabyte is equivalent to 1024 kilobyte
B. Octal number system has 8 Numbers
C. MB stands for megabit
D. 1MB=1000 KB
ANSWER: B
SOLUTION:Octal number system has 8 Numbers
47. Which of the following is octal number equivalent to binary number (110101)2?
A. 12
B. 65
C. 56
D. 1111
ANSWER: B
SOLUTION: Step 1: Write down the binary number
(110101)2
Group all the digits in sets of three starting from the LSB (far right). Add zeros to the left of the last digit if there aren’t enough digits to make a set of three.
110 101
Step 2: Use the table below to convert each set of three into an octal digit. In this case,
110=6, 101=5.
So, the number 65 is the octal equivalent to 110101 in binary.