Quiz 1 OOPs Group A Variable Data Type

Which of the following is a valid variable declaration in Java?

• int 1num;

• float rate = 5.7f;

• double value = "10.5";

• char letter = "A";

Which data type is used to store a single 16-bit Unicode character in Java?

• byte

• char

• String

• boolean

Java does not support the sizeof operator like C/C++. Which of the following is the correct reason?

• Because Java is platform dependent

• Because the size of data types in Java is fixed

• Because Java is not object-oriented

• Because variables in Java have no memory

Which one of the following data types takes the least memory?

• byte

• short

• int

• long

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

• byte

• boolean

• String

• char

What is the range of the short data type in Java?

• –128 to 127

• –32,768 to 32,767

• –2³¹ to 2³¹–1

• 0 to 65,535

Which of the following is not a type of variable in Java?

• Local variable

• Instance variable

• Static variable

• Global variable

What is the process of converting a smaller data type into a larger one automatically called?

• Narrowing

• Widening

• Casting

• Boxing

Which of the following requires explicit casting?

• int to long

• byte to int

• double to int

• char to int

• 257

• 1

• -1

• Compilation error