List of top Questions asked in CBSE CLASS XII

Write a Python function that displays all the lines containing the word 'vote' from a text file "Elections.txt".
For example, if the file contains:
In an election many people vote to choose their representative.
The candidate getting the maximum share of votes stands elected.
Normally, one person has to vote once.
The process of voting may vary with time and region.
Then the output should be:
In an election many people vote to choose their representative.
Normally, one person has to vote once.
Consider the following dictionaries, D and D1:
D = { "Suman": 40, "Raj": 55, "Raman": 60 }
D1 = { "Aditi": 30, "Amit": 90, "Raj": 20 }

(Answer using built-in Python functions only)

(i)
(a) Write a statement to display/return the value corresponding to the key "Raj" in the dictionary D.

OR

(b) Write a statement to display the length of the dictionary D1.

(ii)
(a) Write a statement to append all the key-value pairs of the dictionary D to the dictionary D1.

OR

(b) Write a statement to delete the item with the given key "Amit" from the dictionary D1.
What possible output from the given options is expected to be displayed when the following code is executed?
import random
Cards = ["Heart", "Spade", "Club", "Diamond"]
for i in range(2):
    print(Cards[random.randint(1, i+2)], end="#")
The code given below accepts N as an integer argument and returns the sum of all integers from 1 to N. Observe the following code carefully and rewrite it after removing all syntax and logical errors. Underline all the corrections made.

def Sum(N):
    S = 0
    for I in range(1, N + 1):
        S = S + I
    return S

print(Sum(10))
Assertion (A): We can retrieve records from more than one table in MYSQL.
Reason (R): Foreign key is used to establish a relationship between two tables.
What does the return statement do in a function? Explain with the help of an example.
Write one example of each of the following in Python:
(i) Syntax Error
(ii) Implicit Type Conversion
Which of the following options is the correct protocol used for phone calls over the internet?
Expand ARPANET.
Assertion (A): For a binary file opened using 'rb' mode,
the pickle.dump() method will display an error.
Reason (R): The pickle.dump() method is used to read from a binary file.
Which aggregate function in SQL displays the number of values in the specified column ignoring the NULL values?
In MYSQL, which type of value should not be enclosed within quotation marks?
State True or False:
If table A has 6 rows and 3 columns,
and table B has 5 rows and 2 columns,
the Cartesian product of A and B will have 30 rows and 5 columns.
Which of the following networking devices is used to regenerate and transmit the weakened signal ahead?
Consider the statements given below and then choose the correct output from the given options:
N = '5'
try:
    print('WORD' + N, end='#')
except:
    print('ERROR', end='#')
finally:
    print('OVER')
Which of the following built-in function/method returns a dictionary?
Which of the following is a DML command in SQL?
Consider the statements given below and then choose the correct output from the given options:
D = {'S01': 95, 'S02': 96}
for I in D:
    print(I, end='#')
While creating a table, which constraint does not allow insertion of duplicate values in the table?
Consider the statements given below and then choose the correct output from the given options:
def Change(N):
    N = N + 10
    print(N, end='$$')

N = 15
Change(N)
print(N)
Which of the following is the correct identifier?
Identify the invalid Python statement out of the following options:
Consider the statements given below and then choose the correct output from the given options:
L = ['TIC', 'TAC']
print(L[::-1])
Which of the following operator evaluates to True if the variable on either side of the operator points towards the same memory location and False otherwise?
What will be the output of the following statement?
print(14%3**2*4)