Page 67 - Computer Science Class 11 Without Functions
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3. Richa is learning about the decimal number system. She knows that every symbol in a number is represented by a value,
known as face value. But, she is not clear about the place value of a symbol within a number. Explain to her with an
example.
Ans. In a decimal number system, the value of a digit within a number depends on the position of the digit. For example,
0
the right-most digit is called the one’s digit or unit digit (value 10 = one).
1
the second digit from the right end is called the tens digit (value 10 =ten).
2
the third digit from the right end is called the hundreds digit (value 10 = hundred), and so on.
Now, consider the number 2376. In this number, the place values of different digits are as follows:
Digit 6 represents 6 units (6 × 1)
1
Digit 7 represents 7 tens (7 × 10 )
2
Digit 3 represents 3 hundreds (3 × 10 )
3
Digit 2 represents 2 thousands (2 × 10 )
Assessment
A. Multiple Choice Questions
1. In the decimal number 129.93, what is the positional value of the digit 3?
-1
-2
a. 10 b. 10 c. 10 d. 10 2
0
2. To which system of number representation does the number 17 belong?
a. Decimal b. Octal c. Hexadecimal d. All of these
3. Which of the following is Least Significant digit for the decimal number 95128?
a. 8 b. 1 c. 9 d. 5
4. Consider the statements given below:
Statement A: The decimal number system is not a digital system.
Statement B: All the digital equipment works on just two values – 0s and 1s.
a. Both statements are correct
b. Both statements are incorrect
c. Only statement A is correct.
d. Only statement B is correct.
5. Which of the following is the correct binary equivalent of decimal digit 8?
a. 100 b. 1000 c. 101 d. 1001
6. Which of the following is the correct RGB code for green colour?
a. (FF,00,00) b. (00,FF,00) c. (00,00,FF) d. (00,00,00)
7. Which of the following is the correct binary equivalent of (101) ?
10
a. 1100101 b. 1010011 c. 1100100 d. 1100010
8. Which of the following is the correct binary equivalent of (F0) ?
16
a. 00001111 b. 11001100 c. 11100011 d. 11110000
9. ASCII is an encoding scheme for characters of ____.
a. Hindi b. English c. Japanese d. Both a and b
10. Which of the following is True about ISCII?
a. It is a 7-bit code.
b. It was developed for all Asian languages.
c. Most of the codes used in ASCII are retained in ISCII.
d. The Bureau of Indian Standards has not yet adopted it.
Number Systems and Encoding Schemes 65

