SHERWOOD HALL SENIOR SECONDARY SCHOOL
CLASS: XI
HALF YEARLY EXAMINATION
MARKS: 70
COMPUTER SCIENCE
TIME: 3 Hrs
DATE: 17.12.2021
___________________________________________________________________________
General Instructions:
1. This question paper contains two parts A and B. Each part is compulsory.
2. Both Part A and Part B have choices.
3. Part-A has 2 sections:
a. Section – I is short answer questions, to be answered in one word or
one line.
b. Section – II has two case studies questions. Each case study has
4 case-based subparts.
An examinee is to attempt any 4 out of the 5 subparts.
4. Part - B is Descriptive Paper.
5. Part- B has three sections
a. Section-I is short answer questions of 2 marks each in which
two question have internal options.
b. Section-II is long answer questions of 3 marks each in which
two questions have internal options.
c. Section-III is very long answer questions of 5 marks each in which
one question has internal option.
6. All programming questions are to be answered using Python Language
Question
No
PART-A
Marks
Allocated
Section-I
Select the most appropriate option out of the
options given for each question. Attempt any 15
questions from question no 1 to 21.
1
A DVD is
a) optical disk
b) output device
c) solid state storage
d) hard disk
1
1
5
A single unit which is composed of small group of
bits is known as
a) bit
b) bug
c) flag
d) byte
What characteristic of RAM memory makes it not
suitable for permanent storage?
a) too slow
b) unreliable
c) it is volatile
d) bulky
A small lever shaped device used to control
movement on the screen is classified as
a) joystick
b) mouse
c) keyboard
d) microphone
1 PB =(---) TerraByte
6
According to boolean law: A + 1 = _
1
7
DeMorgan’s theorem states that _________
a)
(AB)’ = A’ + B’
b)
(A + B)’ = A’ * B
c)
A’ + B’ = A’B’
d)
(AB)’ = A’ + B
Write the base value of binary,octal and
hexadecimal number system.
1
The default separator character of print() is
_________
a) _ underscore
b) Space
c) ,comma
d) #
Function range(10,5,-2) will yield an iterable
sequence like _________
a)[10,8,6]
b) [6,8,10]
c) [9,7,5]
d) [5,7,9]
1
2
3
4
8
9
10
1
1
1
1
1
11
12
13
Which of the following is the use of id() function in
python?
a) Id returns the identity of the object
b) Every object doesn’t have a unique id
c) All of the mentioned
d) None of the mentioned
Which of the following is not a valid string
operation in Python?
a) ‘abc’+’abc’
b) ’abc’*3
c) ‘abc’+3
d) ‘abc’.upper()
What is the output of the following statement ?
15
a) 2
b) 0
c) 1
d) Error
What will be the value of the following
expressions: 12 > 15 and 8 > 12 or not 19 > 4
a) True
b) Error
c) False
d) None
What is the output of the following code?
16
a) 64,64,64
b) 512,512,512
c) 12,64,12
d) 512,64,512
What is the output of the following?
14
1
1
1
1
1
1
17
18
19
20
21
22
a) 4,6,7,8,
b) Error
c) None
d) 4
What will be the output of the following code?
print (type(type(int)))
a) type 'int’
b) < class ’type’>
c) Error
d) <class ‘int’>
Find the invalid identifier from the following
a) none
b) address
c) Name
d) pass
What is used to define a block of code (body of
loop, function etc.) in Python?
a) Curly braces
b) Parenthesis
c) Indentation
d) Quotation
A ___________ error does not cause the program
to abort but produces incorrect results.
________is an informal way of describing the steps
of a program’s solution without using any strict
programming language syntax or underlying
technology considerations.
Section-II
Both the Case study-based questions are
compulsory. Attempt 4 subparts from each
question. Each question carries 1 mark
Hidhaf, during Practical Examination of Computer
Science, has been assigned a Python source code
with errors. Help him identify the errors in the
source code
a) Name=”Hidhaf”
Name[3]=”a”
print(Name)
b) A=bool(0)
B=bool(1)
print(A==false)
print(B==true)
1
1
1
1
1
1
1
23
24
c) print(type(int(“123”)))
print(type(int(“Hello”)))
print(type(str(“123.0”)))
d) pi=3.14
print(type(pi))
print(type(“3.14”))
print(type(float(“Three point fourteen”))))
e) print(“Hello”*2)
print(“Hello”+2)
print(“Hello”+”2”)
Hamdan is working on string manipulation
programs.Help him identify the output of the
following scripts where
A=”Hello World”
B=”1234”
C=”1234ABC”
a) A.upper().lower()
A.lower().upper()
b) A.find("Wor”)
A.find(“wor”)
c) A.istitle()
A.isalpha()
d) B.isdigit()
C.partition(‘A’)
e) C.split(‘A’)
C.isdigit()
Part-B
Section-I
Find the output of the following code :
1
1
1
1
1
1
1
1
2
25
26
27
28
29
30
31
32
33
Help Vandana in identifying the incorrect variable
name with justification from the following:
a)
unit@price
b)
fee
c)
userid
d)
avg marks
Write the type of python keywords and user
defined identifiers from the following:
a)
else
b)
Long
c)
break
d)
_count 2
Consider the statement:
first_name = “Tameka”
a)
What is the datatype of first_name ?
b)
Is 325 the same as “321” ? Give reason.
2
a)
2
What is difference between mutable and
immutable in Python?
b)
Distinguish between ‘/’ and ‘%’ operators
Write a program to take two nos and swap two nos.
Write two differences between compiler &
interpreter.
OR
What is the difference between run time errors and
compile time errors? Write one example of each.
Draw a logic circuit diagram for the boolean
expression A.(B + ).
2
2
2
2
2
Explain Flowchart with an example.
Convert the following Decimal numbers to binary
i. 13
ii. 106
iii. 84
iv. 3.25
OR
Convert the following Binary numbers to decimal
i. 10010
ii. 101010
iii. 1010100.011
iv. 11001010
2
2
Section-II
34
Difference between RAM and ROM.
3
OR
Explain the types of Software.
35
Give the output:
3
a)
b)
c)
36
37
Convert the following binary numbers into octal
and hexadecimal numbers.
i.
1110001000
ii.
110110101
iii.
1010100
Define Token. Explain any three types of tokens
available in Python.
OR
Explain Type Conversion and its types.
3
3
38
Section-III
Describe the basic gates? Draw diagrams and truth
tables for all the basic gates?
5
39
Write a Python Program to generate the following
patterns using nested loop
5
40
Write a Python program to Input a string and
determine whether it is a palindrome or not;
convert the case of characters in a string
5
OR
Write a Python program to Count and display the
no. of vowels, consonants, uppercase, lowercase
characters in string.
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