Java Data Types MCQ - Multiple Choice Questions And Answers

Q. Which of the following is a primitive data type in Java?

A. Integer
B. String
C. Double
D. Array
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Q. Which of the following is not a Java data type?

A. Boolean
B. Character
C. String
D. Object
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Q. What is the size of the boolean data type in Java?

A. 8 bits
B. 16 bits
C. 32 bits
D. It depends on the Java version and platform
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Q. Which of the following is not a valid identifier for a variable in Java?

A. myVariable
B. 123variable
C. _myVariable
D. $variable
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Q. Which of the following data types has the highest range of values in Java?

A. byte
B. int
C. long
D. double
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Q. Which of the following is the correct syntax for declaring an array in Java?

A. int arrayName[10];
B. int[arrayName] = new int[10];
C. int[] arrayName = new int[10];
D. intArray arrayName = new int[10];
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Q. What is the default value of a boolean variable in Java?

A. true
B. false
C. 0
D. null
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Q. Which of the following is a floating-point data type in Java?

A. int
B. double
C. char
D. boolean
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Q. What is the purpose of the `boolean` data type in Java?

A. To store whole numbers
B. To store decimal numbers
C. To store true or false values
D. To store characters
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Q. Which keyword is used to declare a constant variable in Java?

A. constant
B. final
C. static
D. abstract
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Q. What is the correct data type to store a whole number in Java?

A. int
B. double
C. String
D. boolean
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Q. What is the correct syntax to declare a variable of type double in Java?

A. int myVariable;
B. double myVariable;
C. String myVariable;
D. boolean myVariable;
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Q. What is the default value of a variable of type boolean in Java?

A. true
B. false
C. Undefined
D. null
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Q. Which data type is used to store a single character in Java?

A. char
B. double
C. String
D. boolean
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Q. What is the correct syntax to declare a variable of type String in Java?

A. int myVariable;
B. double myVariable;
C. String myVariable;
D. boolean myVariable;
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Q. What is the correct syntax to declare a variable of type boolean in Java?

A. int myVariable;
B. double myVariable;
C. String myVariable;
D. boolean myVariable;
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Q. Which of the following is not a valid Java data type?

A. int
B. double
C. float
D. string
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Q. What is the size of the int data type in Java?

A. 4 bytes
B. 8 bytes
C. 2 bytes
D. 1 byte
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Q. What is the size of the double data type in Java?

A. 4 bytes
B. 8 bytes
C. 2 bytes
D. 1 byte
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