ISC sample paper class xi: Important questions

(Part 1 (10 marks). This part consists of compulsory short answer questions , Part 2 (40 marks) this part is divided into 3 sections A,B and C students are requested to answer 2 questions out of 3 from section A, & 1 question out of 2 in section B & C. Each question carries 10 marks) Part I (30 marks) 1. Convert the following Hexadecimal to binary & decimal [4] 1. F8 b. 1A c. 3B d. AA 2. Perform binary multiplication on the following [4] 1. 1010*101 b.1101*0101 3. Express the following into decimal ,octal ,Hexadecimal [4] 1. (110011001)2 4. Convert the following into decimal [4] a. 1101010 b. 01.111 c. 1001.00101 d. 1010111 5. Differentiate between the following [4] 1. BITS & BYTES 2. SIGN BIT & PARITY BIT 6. Define the usage & syntax of the following [4] 1. toString() 3. lastIndexOf() 2. trim() 4. concat() 7. Define output of the following [4] o “Tomorrow”.indexOf(“o”); o “Tomorrow”.lastIndexOf(‘o’); o “Tomorrow”.indexOf(“o”,3); o “Tomorrow”.subString(2,4); 8. Define the output of the following [2] o int k=5,j=2; k+=k++*j– + –k; System.out.println(k); Part II (70 marks) Section A (30 marks) Q1 1. Define the term memory interface? 2. Explain the term Operating system? 3. Write about OOPS? 4. Define what is Object & Exception? Q2 Define the following 1. API 2. Arrays 3. Bytecode Q3 4. Jumping statements(break & continue) 1. Find syntax error if any [2.5] switch(x){ case 1: a1=10; a2=20; case 2:a3=30; break; a4=40; } 2. Give the output of the following [2.5] int amount=500; int balance=200; while(++amount < –balance); System.out.println(amount); 3. What is try – catch block? [1] 4. Convert the following binary to octal & hexadecimal [4] 11011 1010 Q4 1. Explain with logic gate diagram why NAND, NOR, XOR gates are called universal gates? [4] 2. Explain Full adder circuit with help of logic gate diagram, truth table, equation? [3] 3. What is a flip flop? Explain D flip flop with logic gate diagram? [3] Section B (20 marks) Q5 1. What is Intellectual property? [4] 2. What is the moto of free software foundation? [3] 3. Explain software copy rights & patents? [3] Q6 1. Expalin the following 1. Privacy [2] 2. Spam [2] 3. Security issues [2] Q7 4. Phishing 5. Trade mark [2] [2] 1. Explain how is stack different from queue? [5] 2. Write a java program to explain push & pop operation in stack? [5] Section C (20 marks) Q1 Write a program to display the following output 1234554321 1234 4321 123 321 12 21 11 Q 2 Write program to enter Full name of user and print initials in following format Ex Mohandas Karamchand Gandhi O/P M.K.Gandhi. Q3 Write a program to check if a number entered by user is armstrong or not?[Hint 153 is armstrong number because 13+53+33=153]use recursive function. Share this: