Tata Infotech Previous Years Solved Sample Placement Papers

1. How do you access the fourth element of an array named numbers?

   A: numbers[4];

   B: numbers(3);

   C: numbers[3];

   D: numbers.get(3);

   Ans: C

2. Which of the following operators is used for concatenation of two strings?

   A: +

   B: *

   C: &

   D: +=

   Ans: A

3. Which of the following creates a mutable string?

   A: String

   B: StringBuilder

   C: StringChar

   D: StringMutable

   Ans: B

4. In Java, strings are:

   A: Primitive data types

   B: Immutable objects

   C: Mutable objects

   D: Arrays of characters

   Ans: B

5. How do you find the length of a string named 'example'?

   A: example.size()

   B: example.length()

   C: example.getLength()

   D: example.len()

   Ans: B

6. What is the result of the expression "Java" + "Programming"?

   A: JavaProgramming

   B: Java Programming

   C: Java-Programming

   D: JavaProgramming-

   Ans: A

7. Which method is used to compare two strings for equality?

   A: ==

   B: equals()

   C: compare()

   D: isEqual()

   Ans: B

8. Which class can create a string that is thread-safe?

   A: String

   B: StringBuffer

   C: StringBuilder

   D: StringSafe

   Ans: B

9. What is the root class for all Java classes?

   A: Object

   B: Class

   C: Superclass

   D: Root

   Ans: A

10. Which keyword is used to create an instance of a class?

    A: new

    B: return

    C: this

    D: create

    Ans: A

11. Which keyword is used to inherit the properties and methods from another class?

    A: import

    B: package

    C: extends

    D: implements

    Ans: C

12. Which keyword is used to refer to the current instance of a class?

    A: class

    B: this

    C: instance

    D: object

    Ans: B

13. Which keyword in Java is used for importing packages into a program?

    A: import

    B: package

    C: include

    D: requires

    Ans: A