NCERT Solution Chapter 3 Brief Overview of Python Class 11 IP

NCERT Solution Chapter 3 Brief Overview of Python

SUMMARY : Brief Overview of Python

Python is an open-source, high level, interpreter based language that can be used for a multitude of
scientific and non-scientific computing purposes.

Comments are non-executable statements in a program.

An identifier is a user defined name given to a variable or a constant in a program.

Process of identifying and removing errors from a computer program is called debugging.

Trying to use a variable that has not been assigned a value gives an error.

There are several data types in Python — integer, Boolean, float, complex, string, list, tuple, sets,
None and dictionary.

Operators are constructs that manipulate the value of operands. Operators may be unary or binary.

An expression is a combination of values, variables, and operators.

Python has input() function for taking user input.

Python has print() function to output data to a standard output device.

The if statement is used for decision making.

Looping allows sections of code to be executed repeatedly under some condition.

for statement can be used to iterate over a range of values or a sequence.

The statements within the body of for loop are executed till the range of values is exhausted.

NCERT Solution Chapter 3

Q1. Which of the following identifier names are invalid and why?

a) Serial_no.

b) 1st_Room

c) Hundred$

d) Total Marks

e) Total_Marks

f) total-Marks

g) _Percentage

h) True

Q2. Write the corresponding Python assignment statements:

a) Assign 10 to variable length and 20 to variable breadth.

b) Assign the average of values of variables length and breadth to a variable sum.

c) Assign a list containing strings ‘Paper’, ‘Gel Pen’, and ‘Eraser’ to a variable stationery.

d) Assign the strings ‘Mohandas’, ‘Karamchand’, and ‘Gandhi’ to variables first, middle and last.

e) Assign the concatenated value of string variables first, middle and last to variable fullname. Make sure to incorporate blank spaces appropriately between different parts of names.

NCERT Solution Chapter 3

Q3. Which data type will be used to represent the following data values and why?
a) Number of months in a year

b) Resident of Delhi or not

c) Mobile number

d) Pocket money

e) Volume of a sphere

f) Perimeter of a square

g) Name of the student

h) Address of the student

NCERT Solution Chapter 3

Q4. Give the output of the following when num1 = 4, num2 =3, num3 = 2

a) num1 += num2 + num3

b) print (num1)

c) num1 = num1 ** (num2 + num3)

d) print (num1)

e) num1 *= num2 + c #Here c is not defined

f) num1 = ‘5’ + ‘5’

g) print(num1)

h) print(4.00/(2.0+2.0)) i) num1 = 2+9((3*12)-8)/10

j) print(num1)

k) num1 = float(10)

l) print (num1)

m) num1 = int(‘3.14’)

n) print (num1)

o) print(10 != 9 and 20 >= 20)

p) print(5 % 10 + 10 < 50 and 29 <= 29)

Show Answer
Ans.

b) 9

d) 59049

g) 55

h) 1.0

j) 27.2

l) 10.0

n) 10.0

o) True

p) True


Statement e) will show error as here variable c is not defined 

NCERT Solution Chapter 3

Q5. Categorise the following as syntax error, logical error or runtime error:
a) 25 / 0
b) num1 = 25; num2 = 0; num1/num2

Q6. Write a Python program to calculate the amount payable if money has been lent on simple interest. Principal or money lent = P, Rate = R% per annum and Time = T years.

Then Simple Interest (SI) = (P x R x T)/ 100.
Amount payable = Principal + SI.
P, R and T are given as input to the program

Show Answer
Ans. 

 
P=float(input("Enter Principal"))
R= float(input("Enter Rate of interest"))
T= float(input("Enter Time"))
SI = (P * R * T)/100
A = P + SI
print("Amount to be paid is", A) 

Q7. Write a program to repeat the string ‘‘GOOD MORNING” n times. Here ‘n’ is an integer entered by the user.

NCERT Solution Chapter 3

Q8. Write a program to find average of three numbers.

Q9. Write a program that asks the user to enter their name and age. Print a message addressed to the user that tells the user the year in which they will turn 100 years old.

Q10. What is the difference between else and elif construct of if statement?

if condition:
       statement(s)
else:
       statement(s)

if condition : 
    statement
elif condition :
    statement
elif condition :
    statement
|
|
|
|


else :
   statement

NCERT Solution Chapter 3

Q11. Find the output of the following program segments:

a)

for i in range(20,30,2): 
    print(i) 

b) 

country = 'INDIA' 
for i in country: 
          print (i) 

c) 

i = 0; sum = 0 
while i < 9: 
      if i % 4 == 0: 
          sum = sum + i 
       i = i + 2 
print (sum)

NCERT Solution Chapter 3

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NCERT Solution Chapter 3

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