Telco Infotech Previous Years Solved Sample Placement Papers

1. Which of these keywords is used to define interfaces in Java?

   A: intf

   B: Intf

   C: interface

   D: Interface

   Answer: C

   Solution: The interface keyword is used to define interfaces in Java.

2. Which of the following is the superclass of all Java classes?

   A: ArrayList

   B: Abstract Class

   C: Object class

   D: String

   Answer: C

   Solution: The Object class is the superclass of all Java classes.

3. Which of the following is not a Java Profiler?

   A: JProfiler

   B: Eclipse Profile

   C: JVM

   D: JConsole

   Answer: C

   Solution: JVM is not a profiler; it is the Java Virtual Machine. Tools like JProfiler and JConsole are used for profiling.

4. Which of these packages contains the stack overflow variant in Java?

   A: java.io

   B: java.system

   C: java.lang

   D: java.util

   Answer: C

   Solution: The java.lang package contains the stack overflow variant in Java.

5. Which of these statements are wrong about Thread?

   A: start() method is used to start a thread function

   B: run() method is used to start a thread process before start() method in special cases

   C: The thread can be created using only the runnable interface

   D: The thread can be made of a class that extends to the Thread class

   Answer: B

   Solution: The run() method contains the code to be executed in a thread. The start() method is used to start the thread.

6. Which of these keywords is used to block an exception?

   A: check

   B: throw

   C: catch

   D: try

   Answer: D

   Solution: The try block is used to enclose the code that might throw an exception.

7. Which of the following is not an access modifier?

   A: Protected

   B: Void

   C: Public

   D: Confidential

   Answer: B

   Solution: Void is a return type, not an access modifier. Java access modifiers include public, private, protected, and default.

8. What is the range for the type of char data in Java?

   A: 0 to 256

   B: -128 to 127

   C: 0 to 65535

   D: 0 to 32767

   Answer: C

   Solution: char in Java is 16-bit and supports the range 0 to 65535.

9. Which section provides for the implementation of the private server side of the system?

   A: Server

   B: ServerReader

   C: Socket

   D: ServerSocket

   Answer: D

   Solution: ServerSocket provides a system for server-side connections.

10. Arrays in Java are:

    A: Object References

    B: Objects

    C: Primitive Data Type

    D: None

    Answer: B

    Solution: Arrays in Java are treated as objects.

11. Total constructors in the String class?

    A: 3

    B: 7

    C: 13

    D: 20

    Answer: C

    Solution: The String class provides 13 constructors.

12. Where does the system store parameters and local variables whenever a method is invoked?

    A: Heap

    B: Stack

    C: Array

    D: Tree

    Answer: B

    Solution: Parameters and local variables are stored in the stack memory.

13. What difference does it make when Java is out of memory?

    A: MemoryError

    B: OutOfMemoryError

    C: MemoryOutOfBoundsException

    D: MemoryFullException

    Answer: B

    Solution: The Xms flag has no default value, and Xmx typically has a default value of 256MB. A common use of these flags is when you encounter java.lang.OutOfMemoryError.

14. Which of these selection statements in Java do you have?

    A: break

    B: continue

    C: for ()

    D: if ()

    Answer: D

    Solution: Continue and break are jump statements, and for falls under the looping statement.