This set of MCQ(multiple choice questions) focuses on the Programming in Java NPTEL Week 6 Solutions.
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Week 1: Overview of Object-Oriented Programming and Java
Programming Assignment
Week 2: Java Programming Elements
Programming Assignment
Week 3: Input-Output Handling in Java
Programming Assignment
Week 4: Encapsulation
Programming Assignment
Week 5: Inheritance
Programming Assignment
Week 6: Exception Handling
Programming Assignment
Week 7: Multithreaded Programming
Programming Assignment
Week 8: Java Applets and Servlets
Programming Assignment
Week 9: Java Swing and Abstract Windowing Toolkit
Programming Assignment
Week 10: Networking with Java
Week 11: Java Object Database Connectivity
Week 12: Interface and Packages for Software Development
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Programming in Java NPTEL Week 6 Solutions
Q1. Which of the following is NOT a method of the Thread class in Java?
a) isInterrupted ()
b) interrupt ()
c) joins ()
d) sleep ()
Answer: c) joins ()
Q2. Which of the following statement(s) is/are true?
a) public int getId() : returns the id of the thread.
b) public boolean isAlive() : tests if the thread is alive.
c) public void interrupt() : interrupts the thread.
d) public boolean isInterrupted() : tests if the thread has been interrupted.
Answer: a), b), c), d)
Q3. Which of the following can be used to create an instance of Thread?
a) By implementing the Runnable interface.
b) By extending the Thread class.
c) By creating a new class named Thread and calling method run ().
d) By importing the Thread class from package.
Answer: a), b)
Q4. What is the output of the following program?
a) Hello World
b) 5
c) Compile time error
d) ArithmeticException
Answer: c) Compile time error
Q5. Which one of these keywords must be used to handle the exception thrown by try block in some rational manner?
a) try
b) finally
c) throw
d) catch
Answer: d) catch
Q6. Assume the following method is properly synchronized and called from a thread A on an object B: wait(200); After calling this method, when will the thread A become a candidate to get another turn at the CPU?
a) After thread A is notified, or after two seconds.
b) Two seconds after thread A is notified.
c) After the lock on B is released, or after two seconds.
d) Two seconds after lock B is released.
Answer: a) After thread A is notified, or after two seconds.
Q7. The following is a simple program using the concept of thread.
What is the output of the above program?
a) 1
3
b) 1
2
3
4
c) Runtime error
d) 1
2
Answer: a)
Q8. For the program given below, what will be the output after its execution?
a) 0
b) true
c) 1
d) false
Answer: c) 1
Q9. Which of the following is a correct constructor for a thread object?
a) Thread(Runnable a, String str);
b) Thread(Runnable a, int priority);
c) Thread(Runnable a, ThreadGroup t);
d) Thread(int priority);
Answer: a) Thread(Runnable a, String str);
Q10. Which of these keyword(s) is used to manually throw an exception?
a) try
b) finally
c) throw
d) catch
Answer: c) throw
Programming in Java NPTEL Week 6 Solutions
Q1. Which of the following is NOT a method of the Thread class in Java?
a) public void run()
b) public void exit()
c) public void start()
d) public final int getPriority()
Answer: b) public void exit()
Q2. What is difference between starting thread with run() and start() method?
a) There is no difference
b) When you call start() method, main thread internally calls run() method to start newly created Thread
c) run() calls start() method internally
d) None
Answer: b) When you call start() method, main thread internally calls run() method to start newly created Thread
Q3. Which of the following can be used to create an instance of Thread?
a) By implementing the Runnable interface
b) By extending the Thread class
c) By creating a new class named Thread and calling method run()
d) By importing the Thread class from package
Answer: a), b)
Q4. What is the output of the following program?
public class Question
{
public static void main(String[] args) {
try {
int a = 5/0;
System.out.print("a");
} catch (ArithmeticException ae) {
System.out.print("ArithmeticException ");
}catch (Exception e) {
System.out.print(" Exception ");
}
System.out.print("Hello World");
}
}a) Hello World
b) ArithmeticException
c) ArithmeticException Exception Hello World
d) ArithmeticException Hello World
Answer: d) ArithmeticException Hello World
Q5. Which method restarts a dead thread
a) start()
b) restart()
c) restartThread()
d) none
Answer: d) none
Q6. Assume the following method is properly synchronized and called from a thread A on an object B: wait(2000); After calling this method, when will the thread A become a candidate to get another turn at the CPU?
a) After thread A is notified, or after two seconds
b) Two seconds after thread A is notified
c) After the lock on B is released, or after two seconds
d) Two seconds after lock B is released
Answer: a) After thread A is notified, or after two seconds
Q7. The following is a simple program using the concept of thread.
public class Question extends Thread{
public void run(){
for(int i=1; i<5; i++) {
System.out.println(++i);
}
}
public static void main(String args[]) {
Question t1 = new Question();
t1.run();
}
}What is the output of the above program?
a) 1
3
b) 1
2
3
4
c) Runtime error
d) 2
4
Answer: d)
Q8. For the program given below, what will be the output after its execution?
public class Main{
public static void main(String[] args) {
Thread thread = Thread.currentThread();
System.out.print(thread.activeCount());
thread.run();
System.out.print(thread.activeCount());
}
}a) 01
b) False Ture
c) True True
d) 11
Answer: d) 11
Q9. Which of the following is/are not a correct constructor for a thread object?
a) Thread(Runnable a, String str);
b) Thread(Runnable a, int priority);
c) Thread(Runnable a, ThreadGroup t);
d) Thread(int priority);
Answer: b), c), d)
Q10. Which exception is thrown when an array element is accessed beyond the array size?
a) ArrayElementOutOfBounds
b) ArrayIndexOutOfBoundsException
c) ArrayIndexOutOfBounds
d) None of these
Answer: b) ArrayIndexOutOfBoundsException
Q11. Which of these keywords is/are a part of exception handling?
a) try
b) finally
c) thrown
d) catch
Answer: a), b), d)
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