JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Pharmacy I Year COMPUTER APPLICATIONS IN PHARMACY Previous Question Paper (September/October-2021 - R17)

To convert the hexadecimal number 68BE to binary, each digit is converted into its 4-bit binary equivalent:

Combining these, the binary representation is 0110100010111110. To convert this binary number to octal, we group the bits into sets of three starting from the right:

Padding the leftmost group with zeros gives 011, 010, 001, 011, 111, 010. Converting each group to its decimal equivalent:

The resulting octal number is 321372.

The Decimal number system, also known as the base-10 system, is the most widely used positional numeral system. It utilizes ten distinct symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.

Key characteristics include:

• Base (Radix): The system has a base of 10, meaning each position represents a power of 10.
• Positional Value: The value of a digit depends on its position relative to the decimal point. Moving from right to left, positions represent 10⁰, 10¹, 10², and so on.
• Expansion: Any decimal number can be expressed as a sum of its digits multiplied by their respective powers of 10. For example, 456 is calculated as (4 × 10²) + (5 × 10¹) + (6 × 10⁰).
• Fractional Part: Digits to the right of the decimal point represent negative powers of 10 (10^-1, 10^-2, etc.).

This system is the standard for human arithmetic and daily calculations due to its intuitive nature and alignment with the ten digits of human hands.