D) Answer the following questions in short ( 15-20 words) :-(7x2=14):- ( word limit 15-20)
1) Write down the binary addition & subtraction rules
. 2) Briefly explain the Octal number system.
3) What is LIST view?
4) Write down 4 advantages of optical mouse.
5) Write down the difference between shut down and sleep mode in computer. 6) What is compound formula in excel
. 7) What is Range
Answers
Answer:
1. There are 3 basic rules for adding binary numbers:
0 + 0 = 0.
0 + 1 = 1.
1 + 1 = 10. If the sum of 2 bits is greater than 1, we need to shift a column on the left. In decimal system, 1 + 1 = 2. Binary notation of 2 is 10 (1 * 2^1 + 0 * 2^0). So we keep 0 in the 1's column and shift (carry over) 1 to the 2's column.
subtraction rule
0 – 0 = 0.
0 – 1 = 1 ( with a borrow of 1)
1 – 0 = 1.
1 – 1 = 0.
2. The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7. Octal numerals can be made from binary numerals by grouping consecutive binary digits into groups of three (starting from the right). For example, the binary representation for decimal 74 is 1001010
3. Android ListView is a ViewGroup that is used to display the list of items in multiple rows and contains an adapter that automatically inserts the items into the list.
5. When you shut down your PC, all your open programs close and the PC shuts down your operating system. A PC that's shut down uses almost no power. ... Sleep: In sleep mode, the PC enters a low-power state. The PC's state is kept in memory, but other parts of the PC are shut down and won't use any power.