Tata Infotech Previous Years Solved Sample Placement Papers

1. What is the key difference between a while loop and a do-while loop in Java?

   A: The syntax used to define the loop

   B: The number of iterations performed

   C: The condition check timing

   D: The ability to use the break statement

   Ans: C

2. Which loop construct guarantees that the loop body is executed at least once?

   A: for loop

   B: while loop

   C: do-while loop

   D: continue statement

   Ans: C

3. What is an infinite loop?

   A: A loop that executes only once

   B: A loop that never terminates naturally

   C: A loop that contains an unreachable code block

   D: A loop that uses the continue statement

   Ans: B

4. Which statement is used to exit a loop prematurely?

   A: return statement

   B: continue statement

   C: break statement

   D: exit statement

   Ans: C

5. Which loop construct is best suited for iterating over an array or a collection?

   A: for loop

   B: while loop

   C: do-while loop

   D: continue statement

   Ans: A

6. How do you declare an array in Java?

   A: int arrayName;

   B: int[] arrayName;

   C: int arrayName[];

   D: Both b and c

   Ans: D

7. Which method is used to get the length of an array in Java?

   A: length()

   B: size()

   C: getLength()

   D: length

   Ans: D

8. How do you initialize an array in Java?

   A: int[] arr = (1,2,3,4,5);

   B: int arr = {1,2,3,4,5};

   C: int[] arr = new int[]{1,2,3,4,5};

   D: int arr = new int(5);

   Ans: C

9. What happens when you try to access an array element with an index that is out of bounds?

   A: It returns -1

   B: It returns a null value

   C: It throws an exception

   D: It initializes a new array

   Ans: C

10. How can you check if two arrays are equal in Java?

    A: Use the == operator

    B: Use the .equals() method

    C: Use Arrays.equals() method

    D: Compare each element one by one

    Ans: C

11. What is encapsulation in Java?

    A: The process of combining data and methods into a single unit

    B: The process of hiding data and methods within a class

    C: The process of creating multiple instances of a class

    D: The process of reusing code from existing classes

    Ans: B

12. What is inheritance in Java?

    A: The process of creating multiple instances of a class

    B: The process of hiding data and methods within a class

    C: The process of reusing code from existing classes

    D: The process of combining data and methods into a single unit

    Ans: C

13. What is polymorphism in Java?

    A: The ability of a class to inherit properties and behaviors from another class

    B: The process of hiding data and methods within a class

    C: The process of creating multiple instances of a class

    D: The ability of an object to take on many forms

    Ans: D

14. Starting from which Java version can an interface contain method implementations?

    A: Java 5

    B: Java 7

    C: Java 8

    D: Java 9

    Ans: C

15. What is the purpose of the instanceof operator?

    A: Multiply instances

    B: Compare two object references

    C: Check if an object is an instance of a specific class or interface

    D: To create a new instance of a class

    Ans: C

16. Which keyword is used to declare a class variable?

    A: volatile

    B: transient

    C: static

    D: final

    Ans: C

17. Which keyword is used to prevent a class from being inherited?

    A: final

    B: abstract

    C: class

    D: extends

    Ans: A