CBSE ~ COMPUTER SCIENCE ~ CLASS XI ~ CHAPTER 3

CBSE ~ COMPUTER SCIENCE ~ CLASS XI ~ CHAPTER 3 #Python

CBSE ~ COMPUTER SCIENCE ~ CLASS XI ~ CHAPTER 5 #Python (New Syllabus)

1. Create following Variables

i) “mystring” to contain “hello‟

ii) “myfloat‟ to contain “2.5‟

iii) “myint‟ to contain “10‟

Answer: mystring = 'hello'

myfloat = 2.5

myint = 10

2. Write the value justification

i) 2*(3+4) ii) 2*3+4 iii) 2+3*4

Answer: 14,10,14

3. What is the type of the following result:

i) 1+2.0+3

Answer: float, adding/subtracting/multiplying/dividing an integer with a float type results in float.

4. Which of the following is the valid variable name:

i) global ii) 99flag iii) sum iv) an$wer

Answer: sum

5. True of False

i) Character Data type values should be delimited by using the single quote.

ii) None is one of the data type in python

iii) The += operator is used to add the right hand side value to the left hand side

variable.

iv) The data type double is not a valid python data type.

v) Python does not have any keywords

vi) The equal to condition is written by using the == operator

Answer: False,True,False,True,False,True

6. Check all syntactically correct statements

a) Which input statements are correct

i) a = raw_input ( )

ii) a = raw_input (“enter a number”)

iii) a = raw_imput (enter your name)

Answer: Only iii) is incorrect

b) Which print statements are correct?

i) _print “9” + “9”

ii) _print int(“nine”)

iii) _print 9+9

iv) print 9

Answer: iv)

c) Which are correct arithmetical operations?

i) a = 1*2

ii) 2 = 1+1

iii) 5 + 6 = y

iv) Seven = 3 * 4

Answer: i) and iv)

d) Which are correct type conversions?

i) int (7.0+0.1)

ii) str (1.2 * 3.4)

iii) float (“77”+“.0”)

iv) str ( 9 / 0 )

Answer: i) and ii)

e) Which operations result in 8?

i) 65 // 8

ii) 17 % 9

iii) 2 * * 4

iv) 64 * * 0.5

Answer: 8,8,16,8.0

f) Which lines are commented?

i) “””This is a comment”””

ii) # This is a comment

iii) // this is a comment

iv) '''This is a comment'''

Answer: i) & ii)

g) Find the matching pairs of expressions and values.

i) 1023 boolean

ii) None int

iii) [2, 4, 8, 16] tuple

iv) True list

v) 17.54 str

vi) ('Roger', 1952) NoneType

vii) “my fat cat” float

Answer: 1023-int, None-NoneType, [2,4,8,16]-list,True-boolean, 17.54-float, ('Roger', 1952)-tuple,”my fat cat”-str

7. MCQ

i) The __________ data type allows only True/False values [bool]

ii) If the value of a = 20 and b = 20, then a+=b will assign ________ to a [40]

iii) The ____________ operator is used to find out if division of two number

yields any remainder [%]

8. When will following statement in interpreter result into error:

>>> B+4

Answer: when B is not defined before hand or B+4 is not being assigned to any other variable

9. How can we change the value of 6*1-2 to -6 from 4?

Answer: 6*(1-2)

10. Is python case sensitive?

Answer: YES

11. What does 'immutable' mean; which data type in python are immutable.

Answer: Integer & Long , Float/floating point , Complex