11th Standard CBSE Syllabus & Materials
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CBSE 11th Computer Science Software Concepts Model Questions Papers Study Material - QB365
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Published on: 21/10/2025
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Questions + Answers key
Take MCQ Computer Science Test
1.
2.
3.
4.
The hexadecimal equivalent of 1010 is
1016
100016
A16
F16
5.
The binary equivalent of 310 is
00102
00112
01012
10102
6.
The set of instructions given to a computer is called
Program
ALU
CU
Storage
7.
whether these representations of flowchart symbols are True or False
8.
MSB stands for Mathematically Significant Digit
9.
What is AND gate?
10.
What is OR gate?
11.
Expand GUl
12.
Complete the sequence of following octal numbers 424, 425, 426,_____,______
13.
Complete the sequence of following binary number 100, 101, 110, _____,______
14.
Complete the sequence of following hexadecimal numbers 17, 18, 19,____,____,_____,_____
15.
Write base of each of the number systems.
(a) Decimal
(b) Binary
(c) Octal
(d) Hexadecimal
16.
What is LSB ?
17.
Draw a flowchart to print the largest of three numbers.
18.
Draw a flowchart to calculate sum of two numbers
19.
Convert 1C6A16 to (a) Decimal (b) Binary
20.
Convert the following decimal numbers to binary.
(a) 57
(b) 642
21.
Convert following binary numbers to decimal:
(a) 1010
(b) 1101101010
22.
Do as directed.
(a) Convert the Hexadecimal number 3BC into its Binary equivalent
(b) Convert the Binary number 10011010.010101 to its Hexadecimal equivalent.
(c) Convert the Decimal number 345 into Octal number
23.
Verify the following using truth table:
(i) X + 0 = X
(ii) X + 1 = 1
24.
Verify the following using Boolean Laws:
A + C = A + A' + C + B.C
25.
Name the law shown below & verify it using a truth table.
X + X. Y = X + Y.
26.
Write the equivalent boolean expression for the following logic circuit
27.
Draw the equivalent logic circuit diagram for the Boolean expression (A'+B).C
28.
Verify the following using truth table
X + Y.Z = (X + Y). (X + Z)
29.
Draw a logic circuit for the following Boolean expression : AB + CD'
30.
Correct the following boolean statements:
(1) X+1=X
(2) (A)' = X
(3) A+A' = 0
(4) (A+ B)' = A.B
1.
(a)
2.
(a)
3.
(d)
4.
(c)
A16
5.
(b)
00112
6.
(a)
Program
7.
(b)
8.
(a)
9.
( )
The AND Gate can have two or more than two input signals and produce one output signal. It gives output as high i.e. 1 only when all the inputs are high i.e. 1.
10.
( )
The OR Gate has two or more input signals but only one output signal. If any of the input signals is 1(high), the output signal is 1(high).
11.
( )
GUI stands for Graphical User Interface
12.
( )
427, 430
13.
( )
111, 1000
14.
( )
1A, 1B, 1C, 1D
15.
( )
(a) 10
(b) 2
(c) 8
(d) 16
16.
( )
In a binary number, the right most bit carries the smallest weight and hence is called LSB or Least Significant Bit.
17.
18.
19.
(a) 1C6A16= ?10
1C6A16= 1 X 163+ C X 162+ 6 X 161+ A x 160
= 1 x 4096 + 12 x 256 + 6 x 16+ 10 x 1
= 4096 + 3072 + 96 + 10
= 727410
(b) 1C6A16= ?2
116☒00012
C16 ☒11002
616 ☒01102
A16 ☒10102
1C6A16 ☒00011100011010102
20.
5710 = 1110012
(b)
64210=10100000102
21.
10102=1 x 23 + 0 X 22 + 1 X 21 + 0 X 20
= 8 + 2 = 1010
(b) 11011010102=1 X 29 + 1 X 28 + 0 X 27+ 1 X 26 + 1 X 25 + 0 X 24 + 1 X 23 + o X 22 + 1 X 21+ 0 x 20
= 512 + 256 + 0 + 64 + 32 + 0 + 8 + 0 + 0 + 0
= 87410
22.
(a)
| 3BC16=0011101111100 |
(b) 011010.010101
011010. 01010100
9 A. 54
| 011010.0101012=9A.5A16 |
(c) 34510 = -8
| 34510 = 5318 |
23.
(i)
| X | 0 | Y=X+0 |
| 0 | 0 | 0 |
| 1 | 0 | 1 |
(ii)
| X | X' | Y=X+X' |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
24.
A + C = A + A'.C + BC
R.H.S.=(A + C) + BC
= A + C + BC
= A + C(1 + B)
= A + C.1 = A + C = LHS(Hence,verified)
25.
This law is called 'Absorption Law" also referred as redundancy law.
Prove by Truth table
| X | Y | X' | X=X'.Y | X=Y |
| 0 | 0 | 1 | 0 | 0 |
| 0 | 1 | 1 | 1 | 1 |
| 1 | 0 | 0 | 1 | 1 |
| 1 | 1 | 0 | 1 | 1 |
26.
((X.Y)'+ (X.Y)')'
27.
28.
| Truth table for L.H.S. | |||||
| X | Y | Z | Y.Z | X+Y.Z | |
| 0 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 1 | 0 | 0 | |
| 0 | 1 | 0 | 0 | 0 | |
| 0 | 1 | 1 | 1 | 1 | |
| 1 | 0 | 0 | 0 | 1 | |
| 1 | 0 | 1 | 0 | 1 | |
| 1 | 1 | 0 | 0 | 1 | |
| 1 | 1 | 1 | 1 | 1 | |
| Truth table for R.H.S. | ||||||
| X | Y | Z | (X+Y) | (X+Z) | (X+Y).(X+Z) | |
| 0 | 0 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 1 | 0 | 1 | 0 | |
| 0 | 1 | 0 | 1 | 0 | 0 | |
| 0 | 1 | 1 | 1 | 1 | 1 | |
| 1 | 0 | 0 | 1 | 1 | 1 | |
| 1 | 0 | 1 | 1 | 1 | 1 | |
| 1 | 1 | 0 | 1 | 1 | 1 | |
| 1 | 1 | 1 | 1 | 1 | 1 | |
From the two truth tables it can be concluded that L.H.S = R.H.S.
29.
30.
(1) X+1=1 or X+0=X
(2) ((A')' =A
(3) A + A' = 1 or A.A' =0
(4) (A+B)'= A'.B'
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