Worksheets › Class 11 › Encoding Schemes and Number System
Class 11 · Computer Science worksheetEncoding Schemes and Number System
CBSE Computer Science. ASCII, ISCII and Unicode (UTF-8, UTF-32), binary, octal, decimal and hexadecimal, conversions including fractional parts. Every sheet has 20 questions in three sections and an answer key, and the questions change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
Standard ASCII uses how many bits for each character?
- 16
- 32
- 8
- 7
Answer
(d) 7
- 2.
What is (111011000)₂ in decimal?
- 472
- 464
- 456
- 55
Answer
(a) 472
add the place values of the 1s
- 3.
What is (212)₁₀ in binary?
- 11010010
- 11011100
- 11010101
- 11010100
Answer
(d) 11010100
divide by 2 repeatedly and read the remainders from bottom to top
Section B · short answer
- 4.
Why do computers use the binary number system?
Answer
Their circuits have two states, on and off, which stand for 1 and 0.
- 5.
Convert (894)₁₀ into binary.
Answer
1101111110
remainders of repeated division by 2, read from bottom to top
Section C · long answer
- 6.
Explain ASCII, ISCII and Unicode, comparing how many characters each can represent.
Answer
ASCII: 7 bits, 128 characters (English); ISCII: 8 bits, adds Indian scripts; Unicode: codes for every script, stored as UTF-8, UTF-16 or UTF-32.
Fresh sheets for your child
In the app, every Encoding Schemes and Number System sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.