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web.groovymark@gmail.com
- December 26, 2024
Question 21
Which of the following is not a valid Java identifier?
- A. myVariable
- B. 2ndVariable
- C. variable_name
- D. variableName
Answer: B
Explanation: Identifiers cannot begin with a digit.
Question 22
How can you create a constant in Java?
- A. constant int MAX_VALUE = 100;
- B. static int MAX_VALUE = 100;
- C. final int MAX_VALUE = 100;
- D. immutable int MAX_VALUE = 100;
Answer: C
Explanation: You create a constant in Java using the final keyword.
Question 23
What is the output of System.out.println(“Java”.length());?
- A. 4
- B. 5
- C. 6
- D. 0
Answer: B
Explanation: The length() method returns 4 because "Java" has four characters.
Question 24
Which of the following can be used to catch exceptions?
- A. try
- B. catch
- C. finally
- D. All of the above
Answer: D
Explanation: All options are part of the exception handling mechanism in Java.
Question 25
What does the volatile keyword indicate in Java?
- A. The variable can be accessed by multiple threads.
- B. The variable is constant.
- C. The variable is immutable.
- D. The variable cannot be changed.
Answer: A
Explanation: The volatile keyword indicates that a variable can be accessed by multiple threads, ensuring visibility
Question 26
What will the following code output? System.out.println(7 / 2);?
- A. 3.5
- B. 3
- C. 4
- D. Error
Correct Answer: c) Streamlined processes and reduced manual intervention
Explanation: Cloud automation tools streamline processes by reducing manual
intervention, which increases efficiency and consistency.
Question 27
How do you declare an array of integers in Java?
· A. int[] arr;
· B. int arr[];
· C. Both A and B
· D. array int arr;
Answer: B
Explanation: Integer division discards the decimal part, resulting in 3.
Question 28
Which operator is used to compare two values for equality in Java?
- A. =
- B. ==
- C. ===
- D. !=
Answer: B
Explanation: The == operator is used to compare two values for equality in Java.
Question 29
Which method is used to read a line of text from the console?
- A. System.in.readLine();
- B. Scanner.nextLine();
- C. BufferedReader.read();
- D. Console.readLine();
Answer: B
Explanation: The Scanner.nextLine(); method is used to read a line of text from the console.
Question 30
What is the result of 5 + 10 + “20”?
- A. 15
- B. 20
- C. 1520
- D. Error
Answer: C
Explanation: The expression evaluates to "1520" due to string concatenation.
Question 31
How do you declare a method that returns nothing?
- A. void myMethod() {}
- B. null myMethod() {}
- C. myMethod() {}
- D. empty myMethod() {}
Answer: A
Explanation: The void keyword indicates that the method does not return a value.
Question 32
What is the output of System.out.println(5.0 / 0);?
- A. Infinity
- B. 0
- C. NaN
- D. Error
Answer: A
Explanation: Dividing a positive floating-point number by zero results in positive infinity
Question 33
Which of the following data types is used to represent true/false values in Java?
- A. int
- B. char
- C. boolean
- D. String
Answer: C
Explanation: The boolean data type is used to represent true/false values in Java.
Question 34
How do you instantiate an object of a class named Dog?
- A. Dog myDog;
- B. Dog myDog = new Dog();
- C. new Dog myDog;
- D. Dog myDog = Dog();
Answer: B
Explanation: The correct way to instantiate an object is Dog myDog = new Dog();.
Question 35
What will be the output of the following code? System.out.println(2 + 3 + ” apples”);
- A. 5 apples
- B. 23 apples
- C. apples 5
- D. Error
Answer: A
Explanation: The expression evaluates to "5 apples" due to string concatenation.
Question 36
Which of the following is not a valid access modifier in Java?
- A. public
- B. private
- C. protected
- D. secure
Answer: D
Explanation: secure is not a valid access modifier in Java.
Question 37
Which keyword is used to create a subclass in Java?
- A. extends
- B. inherits
- C. subclass
- D. derived
Answer: A
Explanation: The extends keyword is used to create a subclass in Java.
Question 38
How do you declare a method with parameters in Java?
- A. void myMethod(int a) {}
- B. void myMethod(a int) {}
- C. myMethod(int a) {}
- D. void myMethod(a: int) {}
Answer: A
Explanation: The correct syntax to declare a method with parameters is void myMethod(int a) {}.
Question 39
What is the result of System.out.println(3 + 4 + 5);?
- A. 12
- B. 7
- C. 345
- D. Error
Answer: A
Explanation: The expression evaluates to 12 since all numbers are added together.
Question 40
How can you prevent a class from being instantiated?
- A. By using the final keyword
- B. By declaring the class as abstract
- C. By using the static keyword
- D. By declaring a private constructor
Answer: B
Explanation: Declaring a class as abstract prevents it from being instantiated directly.
