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CBSE Class 11 Pre Board 2021 : Computer Science - Prelim (CBSE Gulf Sahodaya Qatar Chapter, Doha)

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PREBOARD EXAMINATION 2020-21 Class: XI (CBSE) Date . SUBJECT - COMPUTER SCIENCE Total Marks: 80 Time: 3 hrs. General Instructions: All questions are compulsory. Question paper is divided in 3 sections, A, B and C Section - A : Unit-1 Section - B : Unit-2 Section - C : Unit-3 SECTION - A Q1 Arrange the following in ascending order: Byte, TB, Bit, MB, KB, GB, Nibble 1 Q2 What is Unicode? 1 Q3 What is the difference between compiler and interpreter? 1 Q4 Which of the following are not input devices? (i) Keyboard (ii) Microphone (iii) Projector (iv) Headphones 1 Q5 Name any 2 temporary storage devices of the computer. 1 Q6 Prove that X.(X+Y) = X, by truth table method 1 Q7 What is the difference between System software and Application software? 1 Q8 Write the equivalent Boolean expression for the following circuit. 1 Q9 Convert the Following as Directed (i) (534) 10 =(?) 2 (ii) (101011) 2 =(?) 10 2 Page 1 of 5 SECTION-B Q1 What is the difference between = = and = operator 1 Q2 What is the value of the expression 4+2**5//10 i) 1233 ii) 7 iii) 9 iv) 45 1 Q3 Write the Python code to create the dictionary to include the list of following names of students and their marks: Sameer 57 Tameem 90 Jhon 92 Jason 78 1 Q4 Why does python report error for the following: str1 = "Hello" str1[2] = 'p' 1 Q5 What will you get the output when you the following python code? i. abc * 2 ii. 2 * 3 1 Q6 Name the function that tells the data type of an object. 1 Q7 Name the Python Library modules which need to be imported to invoke the 1 following functions: (i) sin() (ii) randint () Q8 Write the following expressions using operators used in Python: i) x = a3+ b3 + c3 ii) A= r(r+h)2 2 Q9 Identify the type of Token: i) D_O_B ii) True iii) * iv) if Rewrite the following code in python after removing all syntax error(s). Underline each correction done in the code. 30=To for A in range(0, To) IF A%4==0: print (A*4) ELSE: print (A+3) #indentation 2 Q10 2 Page 2 of 5 Q11 Find and write the output of the following python code: for i in range(2): print(i) 2 for i in range(4,6): print(i) Q12 Find and write the output of the following python code: for x in range(10,20): if( x % 2==0): continue print(x) 2 Q13 Find and write the output of the following python code: s = 'school2@com' k=len(s) m=" " 2 for i in range(0,k): if(s[i].isupper()): m=m+s[i].lower() elif s[i].isalpha(): m=m+s[i].upper() else: m=m+'bb' print(m) Q14 Q15 Write a program to accept an integer and print the multiplication table of 2 that number till 10 in the following format. Eg: if number is 5 5x1=5 5 x 2 = 10 5 x 3 = 15 . . 5 x 10 = 50 2 Write a program to count the number of words in a given String. Sample Run: Input: Hello this is my world Output: Number of Words = 5 OR Differentiate between break and continue statement with the help of an example Page 3 of 5 Q16 Write a program to find the area of a circle 2 Q17 Find the output of the following Python Code: >>>L1=[10,20,30] >>>L2=[110,220,330] >>>L3=L1+L2 >>>L4=L3[0:4] >>>print(L4) >>>L4[0]=L4[0]*10 >>>L4[2]=L4[1]*5 >>>L4[1]=L4[2] >>>L4[3]=L4[3]-10 >>> print(L4) 2 Q18 Write a Python Program to input a string to check whether it is a Palindrome string or not.(A Palindrome string is that which is same from both ends likeSIS,MADAM 3 Q19 Find the output of the following Python Code: 3 x=(100,200,300,400,500,600,700,200,300,500) >>>print(x) >>>print (min(x)) >>>print(x.count(500) >>>print(x[0]+100) >>>print(x.index(400)) >>>print(max(x)+len(x)) Q20 4 Write a program in python to print Month name for the given month number. Sample Output: Input: Enter month number: 5 Output: It s May Q21 Write a program in python to print the following pattern from a given String: Sample Output: 4 Input: ABCD Output: A BB CCC DDDD Q22 Create the following lists using for loop: 4 i. A list containing of integers 1 through 100 ii. A list containing squares of integers 1 through 20 Page 4 of 5 SECTION-C Q1 Name any 2 social networking apps. Q2 1 1 Ravi received a mail form IRS department ( as shown above). On clicking Click- Here , he was taken to a site designed to imitate an officiallooking website, such as IRS.gov. He uploaded some important information on it. Identify and explain the cybercrime being discussed in the above scenario. Q3 What is Cyber Law? 1 Q4 How can we protect our computer from cyber threats? (give only 2 points) 1 Q5 How can we hide our identity on the internet? (give only 2 points) 1 Q6 What is cyber Bullying? Give an example to explain it. (In short) 2 Q7 Define eavesdropping and phishing? 2 Q8 What are the tips to safely browse the internet 2 Q9 Describe Cyber Stalking 2 Q10 What do you mean by a spyware and adware? 2 -END- Page 5 of 5

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