Most Important MCQ Computer Science Class 12 Quiz

1) Identify the output of the following:

l=[44,55,77]

l.insert(2,49)

l.insert(1,53)

print(l[::-2])

2) Which of the following is not a valid identifier?

3) Consider the given declaration s=’python ’. Which of the following is correct output for print(s[1::2])

4) Krish has declared a variable as follows:

x=str(3)

This is known as ______ in python.

5) Which of the following function call statements is valid for a given function header?

def MyFun(p,q,r):

6) Which of the following is not correct in context of scope of variables?

7) What will be the output of following code:

8) Which of the following is not correct in context of Positional and Default parameters in Python functions?

9) Which of the following is not a characteristic of a python dictionary?

10) What is the exponent form of 65.73?

11) Which of the following is the correct statement for the python list l=[1,2,3]?

12) What will be the output of the following:

13) The topmost part of function is known as _______

14) Observe the given function header and select valid function call statements:

def powr(x,y=2):

return x**y

i) powr(5)

ii) powr(4,3)

iii) powr()

iv) powr(x=3)

15) Yashvi wants to call a function named result(). Select an appropriate option and help her to execute the same.

16) Assertion(A): Any element of python list gets changed by its index and new value.

Reasoning(R): Lists are mutable.

17) Assertion(A): Function cannot give any output directly.

Reasoning(R): Function must need return keyword.

18) Consider the declaration l=3,5,6. Identify the type of l.

19) What will be the output of the following statement, if x is 7?

x=input(“Enter the value”)

print(type(x))

20) For a function header as follows:

def Calc (X, Y=40)

Which of the following function calls will give an Error?

Which of the following is the correct statement for closing a file?

Krupa wants to open the file in read-write mode. Select the appropriate file mode for her.

Mona is learning the python data file handling concept. His friend asked her a question regarding the operations on a file. Which of the following operation is not performed on files in python?

Which python module contains different functions for various handling files?

Kunjan is trying to add content to a text file every time he runs the program. But when he is running the program the file content is overwritten every time. How he can resolve this issue? Select a statement to help him.

Which of the following file mode is read-only mode?

Which of the following statement is/are correct about text files?

Every line in a text file is separated by a special character. Which of the following character it is?

The files which represent the actual content such as image, audio, video, etc and not in human-readable form are known as _______

There are mainly two files. They are

Archana's teacher asked her about python file modes. Which of the following is not supported file mode in Python?

Assertion(A): Even a single bit change can corrupt the file and make it unreadable to the supporting application.

Reasoning(R): Binary files are stored in a computer in a sequence of bytes.

Prtyaksh is a class XII student. His teacher asks him to select the correct statement which creates a text file "info.txt" and if file doesn't exist, the statement will create a file. Help him by selecting a correct option.

Which statement is correct about files in Python?

In the statement f=open("info.txt","r"), f is ___________

A ___________ is named location on secondary storage media where data are permanently stored for later access.

Which of the following statement is correct for opening a file data.txt?

i) f=open("data.txt")

ii) f.open("data.txt")

iii) open(f="data.txt")

iv) file.open("data.txt")

Which of the following characters are used to separate the values in a text file?

Which of the following is valid extension for text file?

Users can also use another character as EOL characters in text files except '\n'.

Jay has asked to select one advantage of with clause over the open() function. Select the appropriate option for the same.

Which function is used to read text files line by line using iteration?

Prakash wants to write a row in csv file from a list object. He forgot how to write declare an object for writing. Select the appropriate option to accomplish his task.

What is the function of "w" mode in open()?

To write python object data to csv row, which of following function is used?

Dev has declared a variable as follows:

n=int(input("Enter Number:"))

f=open("marks.txt","w")

Select the appropriate option to write this number into the text file marks.txt.

Observe the syntax of seek() function:

file_object.seek(offset,[, refernce_point])

What offset refers to?

Which of the following function accepts lists or tuples containing strings to write in the file?

Smit has asked to write a program to print all the words from the text file. He wrote the following code but forgot one statement given as fill in the blank.

f=open("news.txt","r")

data=___________

w=data.split()

Dhruv wants to import CSV module in python program. Help him to select an appropriate option from the following:

Reorder the steps to write data into csv file:

1) open csv file using open () function

2) write rows using writer_object.writerow()

3) declare writer_object

4) Close the file

What is the by default value of reference_point in file_object.seek() function?

CSV file row headers are generated automatically from variables taken in the program.

The csv.read(file_object) returns the records in

What this code will do?

file_seek.object(5,0)

If info.txt contains the following content:

"India is one land that all men desire to see."

What will be the output of the code given below

f=open("info.txt")

print(f.read(-4))

Which of the following files allow to save large data in computer memory?

Two ways to open a file in python are

Handling csv files are similar as text files in python in context of open() function.

Which parameter of open function changes the default separate for csv file?

1. The deletion of element in stack refers to

2. Devang is asked to review the following partial code to push an element into the stack. Select the appropriate option to help him.

def Push(stk,ele):

______________

3. Gita is learning the data structure stack. She wants to know about the principle followed by stack to perform various operations on the stack. Select appropriate options for her to accomplish her task.

4. Which method is used to pop an element from the stack?

5. Trying to add an element to full stack results in an exception called ____________

6. Consider the following partial code for the function to check whether the stack is underflow or not. Select the appropriate option to fill in the blanks.

i) len(stk)==0

ii) stk==[]

iii) stk==Empty

7. Trying to delete an element from empty stack results in an exception called _____________

8. Select appropriate applications of the stack from the following:

i) Reverse String

ii) Undo redo commands in a text editor

iii) Arithmetic Expressions in Program

iv) Call History in cell phone

9. Pooja has provided options as follows:

i) Pile of books

ii) Assembly Lines

iii) Browser history

iv) A ticket Line

Identify options which represents stack.

10. Which method is used push an element in the stack?

11. Statement 1: In stack, elements can be added and removed from one end only.

Statement 2: In stack, elements can be added or removed from the top only.

12. Which of the following are popular data structure of python?

i) stack

ii) Queue

iii) Strings

iv) Lists

13. Which of the following function returns the size of stack?

14. Which of the following statement determines the current position of the top in the stack?

15. The insertion operation in stack refers to

16. Which statement(s) is/are correct for sequence data types in python?

i) It represents a collection of elements of either the same or different types

ii) It makes a group of data

iii) Every element of the sequence has its own identity

iv) Different operation like reversal, slicing, counting of elements can be applied on sequence

17. __________ is a mechanism to store, organize and access data along with operations (processing) that can be efficiently performed on the data.

18. What will be the output of the following code:

19. What will be the output for the following code:

20. Which of the following is not a sequence data type?

21. Which of the following operations can be performed on stack?

22. Priya wants to Pop an element from the stack. She has written the following code, Help her to fill in the blank and complete her code.

23. Rearrange the following algorithm in appropriate order:

i) read the value of top most element from the list

ii) find number of elements in the list

iii) insert/delete elements

iv) check underflow or overflow

24. Which of the following statement is correct to create an empty stack?

i) stk = []

ii) stk = list()

iii) stk = None

25. Consider the following stack opetaions:

i) Stack is Empty

ii) 15 is Pushed

iii) 20 is Pushed

iv) 20 is popped

v) 13 is pushed

vi) 19 is pushed

vii) 19 is popped

What will be the final values of stack?

1. The modem at the sender’s end acts

2. PAN can spread upto

3. Identify the device: I am a connector is used to connect coaxial cables.

4. A MAN network can be extended upto

5. Aditya is preparing for an interview. He read somewhere - It refers to a device used for conversion between analog signals and digital bits. Identify the device.

6. Identify the device from the given descriptions:

i) Data arriving on any of the lines are sent out on all the others.

ii) The limitation of Hub is that if data from two devices come at the same time, they will collide.

7. Which of the following is not a network device?

8. Who develops network messaging or email and the symbol '@' comes to mean in 1971?

9. Identify the device: Iam a network adapter is used to set the network in Computers.

10. A group of two or more similar things or people interconnected with each other is called

11. Which of the following is not an example of a network

12. When the protocol TCP/IP introduced as standard protocol on ARPANET?

13. The first message was communicated between which of the following institutes through ARPNET?

14. Which of the following is considered an extended version of LAN that covers large geographical area such as a city or a town?

15. The NSFNET program was founded by

16. Arjun has asked to identify the device which serves as the entry and exit point of a network, as all data coming in or going out of a network must first pass through the gateway in order to use routing paths. Select an appropriate device out of the following to help him.

17. Which of the following are example of WAN

i) internet

ii) Large Business

iii) Educational and Government Organizations

iv) School or Building

18. Which of the following are correct about LAN:

i) It is the most secure compared to other network types

ii) Provides a short-range communication with high speed

iii) Network can be extended upto 100 KM

iv) Provides speed from 100 Mbps to 1 Gbps

19. Which of the following is not a characteristic of a switch?

20. The term internet was coined in which of the following year?

21. Which of the following is an example of MAN?

22. Which device is used to connect a local area network to the internet?

23. A network spread across countries and continent is known as

24. A computer network allows

i) Sharing Resources

ii) Sharing Software

iii) Share Data

iv) Communication

25. The first version of the Wi-Fi standard was introduced in which year?

26. The network PAN can be created using

i) Bluetooth

ii) Wi-Fi Hotspot

iii) Infrared

iv) Router

27. Which of the following connector is a small plastic plug that fits into an an ethernet cable?

28. Identify the device: I am a connector is used to connect ethernet cables

29. The year which is considered as the birth year of WWW is

30. The modem connected at the receiver's end

31. A ______________ is an analog device that works with signals on the cables to which it is connected.

32. The ______ is the largest WAN that connects billions of computers, smartphones, and millions of LANs from different continents.

33. Which of the following device sends signals to only selected devices instead of sending all?

34. Two friends share their data using their mobiles via Bluetooth connection. This type of network is known as ___________

35. A network created in your computer lab is which type of network?

36. Which organization commissioned a research project for the network in the 1960s to connect academic and research institutes located to different locations for scientific collaboration?

37. Every LAN card has a unique address. This address is known as ____________

38. For simple Internet connectivity at home, the gateway is usually the _______ that provides access to the entire Internet.

39. Find the odd one out of the following:

40. The first project commissioned by U.S. Department of Defence was named

1. The arrangement of computers and other peripherals is known as ____________

2. In which topology all nodes are connected with central node?

3. Which of the following is true about ring topology

4. In which of the following topology each device is connected to two other devices, one each on either side ?

5. The first six digits of the MAC address contains

6. IP stands for

7. Which address cannot be changed manually by the user or network admin?

8. Which of the following is not a network topology?

9. MAC stands for

10. Which topology is hierarchical topology?

11. _________ topology has a single backbone wire that is connected to every device in the network.

12. Which address is represented by eight groups of hexadecimal numbers separated by colons?

13. identify the MAC address

14. Identify the topology:

i) Each device is connected to the other

ii) More secure compared to other topologies

iii) Wiring is too complex

iv) there are many redundant or unutilised connections

15. An IPV4 address is _____ bit numericaddress.