OOPJ- Data Types-Java

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

• 8 bytes
• 4 bytes
• 2 bytes
• 1 byte

Which of the following can be a valid value for a char data type in Java?

• "A"

• 'A'

• 65

• 'A' and 65

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

• int
• float
• byte
• double

Which of the following is not a valid identifier in Java?

• myVariable
• var_1
• 3rdVariable
• _tempVar

In Java, which datatype is used to store True/False values?

• int
• char
• boolean
• float

Which of the following is a correct way to declare an hexa decimal value in Java?

• int num = 0x1a;
• int num = 1a;
• int num = #1a;
• int num = &1a;

Which of the following is the correct way to declare a boolean variable named isJavaFun and initialize it to true in Java?

• boolean isJavaFun = true;
• boolean isJavaFun == true;
• isJavaFun = boolean.true;
• boolean isJavaFun = 'true';

Automatic type conversion in Java takes place when

• Two types are compatible and the target type is larger than the source type
• Two types are incompatible
• The source type is larger than the target type
• Both types are the same

An identifier in Java is

• A sequence of characters that consists of letters, digits, underscores (_), and dollar signs ($).
• A sequence of numbers only.
• A sequence of special characters only.
• A sequence of letters only.

How would you declare a variable storing the tax rate?

• int taxRate = 5.1;

• taxRate = "5.1";

• double taxRate = 5.1;

• double taxRate = "5.1";