TATA ELXSI Previous Years Solved Sample Placement Papers

1. What is the output of the expression true || false?

   a) true

   b) false

   c) null

   d) 0

   Ans: a) true

2. Which of the following is not a primitive data type in Java?

   a) byte

   b) String

   c) double

   d) short

   Ans: b) String

3. What is the default value of the int data type?

   a) 0

   b) 1

   c) null

   d) Undefined

   Ans: a) 0

4. Which of the following data types can store a floating-point number?

   a) int

   b) byte

   c) double

   d) char

   Ans: c) double

5. Which data type can store a single character?

   a) String

   b) byte

   c) char

   d) int

   Ans: c) char

6. How many bits does the long data type use?

   a) 8

   b) 16

   c) 32

   d) 64

   Ans: d) 64

7. What's the main difference between int and Integer in Java?

   a) No difference

   b) Integer can store larger values than int

   c) int is a primitive data type, while Integer is a class

   d) int can be null, while Integer cannot

   Ans: c) int is a primitive data type, while Integer is a class

8. Which loop construct in Java is best suited when the number of iterations is known?

   a) for loop

   b) while loop

   c) do-while loop

   d) break statement

   Ans: a) for loop

9. Which is the C# class from which the UInt data type is derived?

   A: System.Int16

   B: System.Int32

   C: System.UInt16

   D: System.UInt32

   Ans: D

   Explanation:

   The UInt data type is derived from the System.UInt32 class.

10. Which is the first line of a C# program?

    A: using System;

    B: using system;

    C: using Namespace;

    D: namespace MyApplication

    Ans: A

    Explanation:

    The first line of a C# program is:

    using System;

11. Which keyword is used to declare an interface in C#?

    A: interface

    B: Interface

    C: implement

    D: Implement

    Ans: A

    Explanation:

    In C#, an interface can be declared using the interface keyword. An interface can contain declarations of methods, properties, indexers, and events.

12. In C#, by default, the default interface methods are ___.

    A: virtual

    B: sealed

    C: private

    D: public

    Ans: A

    Explanation:

    In C#, by default, the default interface methods are virtual unless the sealed or private modifier is used.