srijit hitartho

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✨ ICSE Computer Applications Assessment ✨

Computism Lab

Class 8 - Java Programming & Basic Concepts

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Subject: Computer Applications (Java)

Max Marks: 70

Time Allowed: 2 Hours

Section A: Multiple Choice Questions on Datatypes10 Marks

1. What is the size of an `int` data type in Java?
   • a. 2 bytes
   • b. 4 bytes
   • c. 8 bytes
   • d. 1 byte
2. Which of the following is a non-primitive (reference) data type in Java?
   • a. int
   • b. char
   • c. String
   • d. double
3. What is the default value of a `boolean` data type variable in Java?
   • a. true
   • b. false
   • c. 0
   • d. null
4. Which data type occupies the maximum memory space in Java?
   • a. float
   • b. int
   • c. double
   • d. short
5. What is the size of a `char` data type in Java?
   • a. 1 byte
   • b. 2 bytes
   • c. 4 bytes
   • d. 8 bytes
6. Which of these integer data types has the smallest range?
   • a. int
   • b. long
   • c. byte
   • d. short
7. Which data type is appropriate for storing fractional numbers like `99.99` by default?
   • a. float
   • b. double
   • c. int
   • d. char
8. What kind of literal is `true` in Java?
   • a. Integer literal
   • b. Boolean literal
   • c. Character literal
   • d. String literal
9. Which category do primitive data types belong to?
   • a. User-defined
   • b. Reference
   • c. Built-in / Fundamental
   • d. Derived
10. What is the default data type for whole integer numbers in Java expressions?
    • a. byte
    • b. short
    • c. int
    • d. long

Section B: Assertion-Based MCQs on Java Basics10 Marks

1. Assertion (A): Java is a platform-independent language.
   Reason (R): Java code is compiled into bytecode which can execute on any system with a JVM.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both A and R are true, but unrelated.
   c) A is true, R is false.
   d) A is false, R is true.
2. Assertion (A): Variable names in Java are case-sensitive.
   Reason (R): `Rate` and `rate` are interpreted as two distinct identifiers by the Java compiler.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both are true, unrelated.
   c) A is true, R is false.
   d) A is false, R is true.
3. Assertion (A): Every executable Java application requires a `main()` method.
   Reason (R): The JVM looks for the `main()` method as the starting point for program execution.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both are true, unrelated.
   c) A is true, R is false.
   d) A is false, R is true.
4. Assertion (A): Semicolons are optional at the end of statements in Java.
   Reason (R): Every complete Java statement must be terminated with a semicolon.
   a) Both are true.
   b) A is true, R is false.
   c) A is false, but R is true.
   d) Both are false.
5. Assertion (A): Comments are executed during runtime to calculate values.
   Reason (R): Comments are ignored by the compiler and are meant only for documentation.
   a) Both are true.
   b) A is true, R is false.
   c) A is false, but R is true.
   d) Both are false.
6. Assertion (A): The assignment operator (`=`) is used to test equality between two variables.
   Reason (R): Equality is tested using the relational operator `==`.
   a) Both A and R are true.
   b) A is true, R is false.
   c) A is false, but R is true.
   d) Both are false.
7. Assertion (A): The `print()` method prints text and keeps the cursor on the same line.
   Reason (R): `println()` automatically inserts a newline character after printing output.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both are true, unrelated.
   c) A is true, R is false.
   d) A is false, R is true.
8. Assertion (A): Keywords can be used as variable names in Java.
   Reason (R): Keywords are reserved words with pre-defined meanings in the Java language.
   a) Both A and R are true.
   b) A is true, R is false.
   c) A is false, but R is true.
   d) Both are false.
9. Assertion (A): The `if-else` statement is used for decision-making in Java.
   Reason (R): It allows alternate blocks of code to execute depending on a boolean condition.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both are true, unrelated.
   c) A is true, R is false.
   d) A is false, R is true.
10. Assertion (A): Division of two integers using `/` yields an integer result, discarding fractional parts.
    Reason (R): Integer division truncates any decimal remainder in Java.
    a) Both A and R are true, and R is the correct explanation of A.
    b) Both are true, unrelated.
    c) A is true, R is false.
    d) A is false, R is true.

Section C: True or False5 Marks

1. Java is an object-oriented programming language. (True / False)
2. A variable name in Java can start with a numeric digit. (True / False)
3. The postfix increment operator (`++`) increases the value of the variable after its evaluation. (True / False)
4. The `else` block is compulsory whenever an `if` statement is used. (True / False)
5. Single-line comments in Java begin with `//`. (True / False)

Section D: Find the Output (Prefix/Postfix & If-Else Snippets)20 Marks

1. Snippet 1:
   
   int a = 5;
   int b = ++a + a++;
   System.out.println("a = " + a + ", b = " + b);
2. Snippet 2:
   
   int x = 10;
   int y = x++ + 3;
   System.out.println("x = " + x + ", y = " + y);
3. Snippet 3:
   
   int m = 8;
   int n = --m - m--;
   System.out.println("m = " + m + ", n = " + n);
4. Snippet 4:
   
   int a = 12;
   if (a % 2 == 0) {
     System.out.println("Even");
   } else {
     System.out.println("Odd");
   }
5. Snippet 5:
   
   int p = 5, q = 10;
   if (p > q) {
     System.out.println(p);
   } else {
     System.out.println(q);
   }
6. Snippet 6:
   
   int val = 4;
   int res = --val * 2;
   System.out.println("val = " + val + ", res = " + res);
7. Snippet 7:
   
   int num = 7;
   if (num > 5) {
     num += 3;
   } else {
     num -= 2;
   }
   System.out.println(num);
8. Snippet 8:
   
   int x = 2;
   int y = x++ + ++x + x;
   System.out.println(y);
9. Snippet 9:
   
   int score = 75;
   if (score >= 90) {
     System.out.println("Grade A");
   } else if (score >= 60) {
     System.out.println("Grade B");
   } else {
     System.out.println("Grade C");
   }
10. Snippet 10:
    
    int c = 3;
    int d = c++ * ++c;
    System.out.println("c = " + c + ", d = " + d);

Section E: Java Basic Programs (5 Programs)25 Marks

1. Program 1: Even or Odd Number Checker
   Write a Java program to check whether a given integer (`int n = 14`) is even or odd using an `if-else` statement.
   
   
   
2. Program 2: Greatest of Three Numbers
   Write a Java program to find and print the greatest among three given numbers (`a = 15`, `b = 25`, `c = 20`) using nested `if-else`.
   
   
   
3. Program 3: Simple Interest Calculator
   Write a Java program to calculate Simple Interest given Principal (`P = 5000`), Rate (`R = 7.5`), and Time (`T = 3` years) using the formula $SI = (P \times R \times T) / 100$.
   
   
   
4. Program 4: Print Numbers from 1 to 10
   Write a Java program using a `for` loop to print numbers from 1 to 10, each separated by a space or on a new line.
   
   
   
5. Program 5: Vowel or Consonant Checker
   Write a Java program using a `switch` statement to check whether a given character (`char ch = 'e'`) is a vowel or a consonant.
   
   
   

⭐ Best of Luck for Your Examination! Code with Precision and Confidence! 🚀

CREATED BY BIJAN KRISHNA PAUL