Multiple Choice ICS2606

 Which of the following is a valid way to create an array in Java?

1. int[] arr = new int[5];  

2. array int arr = new int[5];  

3. int arr = new int[5];  

4. int arr[] = 5;  

*Answer:* 1. int[] arr = new int[5];

 What is the default value of a boolean variable in Java?

 false  

2. true  

3. undefined  

Answer: 1. false  

 What is the result of the expression: 10 % 3?

1. 10  

2. 1  

3. 0  

4. 3  

Answer: 2. 1  

4. Which of the following is a benefit of using inheritance?

1. Increased complexity  

2. More memory usage  

3. Slower execution  

4. Code reusability  

*Answer:* 4. Code reusability

5. All variables in Java must be declared before they can be used.

1. TRUE  

2. FALSE  

Answer: 1. TRUE  

What is the data type of the variable "name" if it is declared as follows: name = "John";?

1. double  

2. int  

3. String  

4. char  

Answer: 3. String  

What is polymorphism in object-oriented programming?

1. Ability to create multiple classes  

2. Ability to encapsulate data  

3. Ability to inherit properties  

4. Ability to take many forms  

Answer: 4. Ability to take many forms  

9. The value of a variable can be changed after it has been declared.

1. TRUE  

2. FALSE  

Answer: 1. TRUE  

What is a variable in Java?

1. A data type  

2. A container to store data  

3. To create methods  

4. A method of outputting data  

*Answer:* 2. A container to store data

 Which of the following methods can be used to find the length of a one-dimensional array in Java?

1. arr.length()  

2. arr.length  

3. length(arr)  

4. size(arr)  

Answer: 2. arr.length  

Program tasks are listed inside the main() method in Java.

1. FALSE  

2. TRUE  

Answer: 2. TRUE  

In Java, which keyword is used to refer to the parent class in a subclass?

1. parent  

2. super  

3. this  

4. base  

*Answer:* 2. super 

What is the output of the following code: System.out.println(5 + 3)?

1. 5  

2. 53  

3. 8  

4. Error  

*Answer:* 3. 8 

 Which of the following is the correct way to declare a method in Java?

1. methodName void()  

2. void methodName()  

3. void methodName()  

4. method voidName()  

Answer: 2. void methodName()  

 What is the syntax for declaring a variable in Java?

1. type variableName;  

2. variableName = value;  

3. value = variableName;  

4. type variableName = value;  

Answer: 1. type variableName;  

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How do you access the third element of an array named 'arr' in Java?

1. arr(3)  

2. arr(2)  

3. arr[3]  

4. arr[2]  

Answer: 4. arr[2]  

. Which of the following keywords is used to create a new class in Java

1. create  

2. new  

3. define  

4. class  

Answer: 4. class  

### 19. Which of the following is an example of compile-time polymorphism?

1. Interface Implementation  

2. Method Overloading  

3. Abstract Classes  

4. Method Overriding  

Answer: 2. Method Overloading  

 What is the primary purpose of inheritance in object-oriented programming?

1. To declare variables  

2. To create a new class from an existing class  

3. To implement interfaces  

4. To define a method  

*Answer:* 2. To create a new class from an existing class

 21. What is the purpose of the 'enum' keyword in Java?

1. Implement an interface  

2. To create a new class  

3. To define a set of named constants  

4. To declare a variable  

Answer: 3. To define a set of named constants  

22. Which of the following is a valid way to declare a constant in Java?

1. final int x = 10;  

2. const int x = 10;  

3. int x = 10;  

4. static int x = 10;  

Answer: 1. final int x = 10;  

 What is the purpose of the 'static' keyword in Java

1. To create an instance of a class  

2. To create a constant variable  

3. To define a method that belongs to the class rather than instances  

4. To indicate a variable is private  

Answer: 3. To define a method that belongs to the class rather than instances  

24. In which programming language is polymorphism commonly implemented through interfaces?

1. C++  

2. Java  

3. Python  

4. JavaScript  

Answer: 2. Java  

### 25. What is the main advantage of using polymorphism in object-oriented programming?

1. To restrict access to class members  

2. To allow methods to be defined in multiple ways  

3. To improve memory usage  

4. To increase the complexity of the code  

Answer: 2. To allow methods to be defined in multiple ways  

 26. Which of the following keywords is used to inherit a class in Java?

1. extends  

2. super  

3. implements  

Answer: 1. extends  

27. Can an enum in Java implement interfaces?

1. TRUE  

2. FALSE  

Answer: 1. TRUE  

 28. The System.out.println() method is used to print output to the console in Java.

1. FALSE  

2. TRUE  

Answer: 2. TRUE