Which of the following is a valid Java identifier?

• my Variable
• 2ndVariable
• variable-1
• myVariable

What is the decimal equivalent of the octal number 34?

• 28
• 31
• 42
• 25

How is the decimal number 63 represented in hexadecimal?

• 3F
• 6E
• FF
• 63

How is the octal number 54 converted to binary?

• 110011
• 101100
• 100101
• 111000

What is the result of the expression int x = 5; x++;?

• 6
• 4
• 10
• 7

What is the value of int y = 8; y--; after this statement is executed?

• 5
• 9
• 6
• 7

What does the expression int z = 10; ++z; evaluate to?

• 11
• 0
• 12
• 10

What is the output of the following code? int a = 3; System.out.println(++a + a++);

• 8
• 10
• 5
• 7

What is the purpose of the 'if' statement in Java?

• To execute a block of code only if a specified condition is true.
• To execute a block of code only if a specified condition is false.
• To execute a block of code regardless of any condition.
• To execute a block of code only if a specified condition is partially true.

How is a simple 'if' statement structured in Java?

• To declare a variable

• To perform a specific action based on a condition

• To iterate over a collection

• To define a method