Java Data Types Quiz - MCQ - Multiple Choice Questions

In this blog post, we present a Java Data Types quiz to test your knowledge and understanding of different data types in the Java programming language. 

Data types define the nature of data stored in variables and play a crucial role in determining their behavior and memory usage. Let's dive into the quiz questions and see how well you can tackle these challenges!

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Each question is followed by the correct answer and an explanation to help reinforce your knowledge.

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

a) String

b) int

c) Array

d) Object

Answer:

b) int

Explanation:

In Java, int is one of the eight primitive data types. The others are byte, short, long, float, double, char, and boolean.

2. What is the default value of a boolean in Java?

a) 0

b) false

c) null

d) undefined

Answer:

b) false

Explanation:

The default value for a boolean data type is false.

3. What is the size of a double data type in Java?

a) 4 bytes

b) 2 bytes

c) 8 bytes

d) 16 bytes

Answer:

c) 8 bytes

Explanation:

In Java, the double data type occupies 8 bytes.

4. Which of the following can be a valid value for a char data type?

a) "A"

b) 'A'

c) 65

d) Both b and c

Answer:

d) Both b and c

Explanation:

In Java, the char data type can represent a single character using single quotes like 'A' or an ASCII value like 65.

5. Which data type value can an int variable not store?

a) -32768

b) 100000

c) 2147483648

d) -2147483648

Answer:

c) 2147483648

Explanation:

The int data type in Java has a range from -2147483648 to 2147483647.

6. Which of the following is not a primitive data type in Java?

a) float

b) void

c) char

d) short

Answer:

b) void

Explanation:

void is not a primitive data type. It indicates that a method does not return any value.

7. Which data type would be most suitable for storing the price of an item in a store?

a) int

b) double

c) boolean

d) char

Answer:

b) double

Explanation:

The double data type is most suitable for representing prices because it can handle decimal values.

8. What is the default value of a char in Java?

a) 0

b) '\0'

c) ' '

d) null

Answer:

b) '\0'

Explanation:

The default value of a char data type in Java is the null character '\0'.

9. Which of these is an immutable class in Java?

a) StringBuilder

b) String

c) int

d) CharSequence

Answer:

b) String

Explanation:

In Java, String objects are immutable, meaning their values cannot be changed after they are created.

10. How many bits is the long data type in Java?

a) 32

b) 16

c) 64

d) 128

Answer:

c) 64

Explanation:

The long data type in Java is 64 bits or 8 bytes.

11. Which of the following is the smallest primitive data type in Java?

a) short

b) int

c) byte

d) long

Answer:

c) byte

Explanation:

In Java, the byte data type uses 8 bits and has the smallest size among the primitive data types.

12. Which of the following is the largest primitive data type in Java?

a) byte

b) short

c) int

d) double

Answer:

d) double

Explanation:

The double data type uses 64 bits (8 bytes) and is the largest among the primitive data types in Java, especially in terms of floating-point data types.

13. Which of the following data types comes under floating data types in Java?

a) char

b) int

c) float

d) boolean

Answer:

c) float

Explanation:

In Java, the float and double are the two primitive data types that represent floating-point numbers. Among the options given, float is the correct choice.

14. Character data type cannot store the following value:

a) 'A'

b) 65

c) '\u0041'

d) 0x0041

Answer:

b) 65

Explanation:

The char data type in Java is used to store a single character. While 'A', '\u0041', and 0x0041 represent the character 'A', the value 65 is a numeric value and cannot be directly stored in a char variable without a typecast.

15. What is the size of an integer in Java Programming?

a) 1 byte

b) 2 bytes

c) 4 bytes

d) 8 bytes

Answer:

c) 4 bytes

Explanation:

In Java, the int data type is 32 bits, which equates to 4 bytes.

Hopefully, this quiz provided an informative and enjoyable challenge. Understanding data types is a critical step in mastering Java. Keep exploring and refining your knowledge, and remember, every coding journey is unique, so embrace yours!