Threads -Java Programming MCQ Questions and Answers

1

What is a thread in Java?

A) A lightweight process that runs independently within a program B) A data structure to store variables C) A type of loop D) A synchronization mechanism

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Answer & Solution

Answer: Option A

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2

Which interface is used to create a thread in Java?

A) Processor B) Executor C) Threadable D) Runnable

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Answer & Solution

Answer: Option D

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3

What is the main advantage of using multithreading in Java programs?

A) Reduced memory usage B) Simplicity of code C) Improved program performance by utilizing multiple CPUs or CPU cores D) Elimination of exceptions

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Answer & Solution

Answer: Option C

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4

How can you create a new thread in Java by implementing the Runnable interface?

A) Create an object of the Thread class B) Create a class that implements the Runnable interface and override the run() method C) Use the start() method of the main thread D) None of These

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Answer & Solution

Answer: Option B

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5

What is the purpose of the start() method in Java threads?

A) It resumes the execution of a thread B) It suspends the execution of a thread C) It starts the execution of a new thread D) It stops the execution of a thread

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Answer & Solution

Answer: Option C

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6

In Java, can a thread be restarted after it has completed execution?

A) Yes, a thread can be restarted multiple times B) Only if the thread is marked as "final" C) Only if the thread is marked as "static" D) No, a thread cannot be restarted once it has completed

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Answer & Solution

Answer: Option D

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7

What is the result of calling the run() method directly instead of start() in Java threads?

A) The run() method is executed in the current thread, not as a separate thread B) It starts a new thread and executes the run() method C) It stops the thread immediately D) It suspends the thread

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Answer & Solution

Answer: Option A

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8

How can you achieve synchronization between threads in Java?

A) By using the interrupt() method B) By using the wait() and notify() methods C) By using multiple catch blocks D) By using the synchronized keyword or synchronized blocks

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Answer & Solution

Answer: Option D

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9

What is a race condition in multithreaded Java programs?

A) A situation where threads synchronize perfectly B) A situation where threads never finish executing C) A situation where multiple threads access shared data simultaneously, leading to unpredictable results D) A situation where threads throw exceptions

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Answer & Solution

Answer: Option C

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10

In Java, what is the purpose of the sleep() method in threads?

A) It terminates all threads in the program B) It pauses the execution of the current thread for a specified duration C) It resumes the execution of a thread D) None of These

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Answer & Solution

Answer: Option B

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