The underlined options are the correct answers. Read and learn!

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Q1. What is garbage collection in the context of Java?

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1. The JVM checks the output of any Java program and deletes anything that doesn’t make sense.

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2. Any package imported in a program and not used is automatically deleted.

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3. The operating system periodically deletes all of the java files available on the system.

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4. When all references to an object are gone, the memory used by the object is automatically reclaimed.

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Q2. Which class cannot be sub classed (or extended) in java?

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1. Parent class

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2. Final class

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3. Abstract class

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4. None of these

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Q3. Which package is used for creating and implementing applets?

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1. java.util

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2. java.applet

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3. java.awt

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4. java.lang

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Q4. __________ Variables and methods can be called without using the objects.

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1. Abstract

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2. None of these

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3. Final

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4. Static

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Q5. Runnable is?

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1. Variable

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2. Class

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3. Interface

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4. Method

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Q6.____________ are utilized to control the access to an object especially in multi-threaded programming

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1. Synchronized methods

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2. Serialized methods

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3. Asynchronized methods

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4. None 

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Q7. In Runnable, many threads share the same object instance. True or False?

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1. Can’t be determined

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2. True

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3. Always false

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4. False but not always 

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Q8.__________ is a special method in java that enables an object to initialize itself when it is created.

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1. Constructor

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2. Final

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3. Destructor

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4. Static

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Q9.If method have same name as class name and method don’t have any return type then it is known as

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1. Constructor

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2. Object

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3. Variable

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4. Destructors 

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Q10.Decrement operator, –, decreases value of variable by what number?

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1. 3

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2. 4

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3. 2

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4. 1