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3. What are the two symbols present in the binary number system?

a. 1 and 2 b. 0 and 1
c. 8 and 9 d. 5 and 6
3. a b c d
4. Which of the following is equivalent to the decimal number
(345) ?
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a. (101011001) b. (110111001) 4. a b c d
2 2
c. (111011101) d. (111110001)
2 2
5. Which of the following is equal to 0+1 in binary addition? 5. a b c d

a. 0 b. 1
c. 10 d. 2

B. True and False assessment.
1. A number system is a collection of numbers used to describe various quantities.

2. The base of decimal number system is 8.
3. The word binary comes from ‘Bi’ meaning two.

4. The octal number system is used as a shorthand representation of long binary
numbers.
5. The hexadecimal number system consists of 16 digits.

C. Give appropriate responses to the questions.
1. What is an octal number system?

2. How many bits are there in 1 nibble?
3. What do you mean by base in a number system?

4. What is number system? Explain.
5. What are rules to convert a decimal number into a binary number?

Analyt ical Skills

Fill in the blanks with equivalent decimal numbers or binary numbers.
a. (10101) _______________ b. (1111011) _______________
2 2
c. (361) _______________ d. (6) _______________
10 10
e. (101) _______________ f. (100101101) _______________
10 2
g. (1100) _______________ h. (165) _______________
2 10
i. (1010001) _______________ j. (1101010) _______________
2 2
.
Competency Based Questions
1. Prashant noticed the given numbers while working (256) and (2AF) . Which number
8 16
system do they belong to? How can he tell?

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