CS506 MIDTERM SOLVED MCQS with references by MOAAZ

Question: If we remove static from main then program __________.

1: Program cannot compile
2: Program will compile and work properly
3: Run time errors
4: Exception throws in main
Correct Answer: 4

Question: If we remove String array from main then program__________.

1: Program cannot compile
2: Program will compile and work properly
3: Run time errors
4: Exception throws in main
Correct Answer: 3

Question: Java developed in _________.

1: 1990
2: 1995
3: 1997
4: 2000
Correct Answer: 2

Question: Which of the following methods are invoked by the AWT to support paint and repaint operations?

1: paint( )
2: repaint( )
3: draw( )
4: redraw( )
Correct Answer: 1

Question: When defining a method you must include a ___________ to declare any exception that might be thrown but is not caught in the method.

1: try block
2: finally block
3: catch block
4: throws-clause
Correct Answer: 4

Question: Aside from the Scanner class, which of the following classes can be used for text-file file input?

1: ObjectInputStream
2: BufferedReader
3: StringTokenizer
4: None of these
Correct Answer: 2

Question: Which of the following statements is true regarding Vectors with no specified base type?

1: A base type is needed because Java needs to know how to allocate memory.
2: No base type is needed because Java will use the Object class as a base type.
3: If a base type is not specified the code will not compile.
4: No base type is needed because Vectors default to storing String objects.
Correct Answer: 2

Question: A serializable class must implement the method(s) _________.

1: readObject and writeObject
2: Either readObject or writeObject, or both, depending upon the desired behavior
3: No need to implement any method
4: None of the given option
Correct Answer: 3

Question: You can ———to a network using sockets.

1: Read
2: Write
3: Read/Write
4: None of these
Correct Answer: 3

Question: Socket is a ————–communication channel between hosts.

1: Uni-directional
2: Bi-directional
3: Multi-directional
4: None of these
Correct Answer: 2

Question: Which of the following are passed as an argument to the paint ( ) method?

1: A Canvas object
2: A Graphics object
3: An Image object
4: A paint object
Correct Answer: 2

Question: The code below draws a line. What color is the line?
g.setColor(Color.red.green.yellow.red);
g.drawLine(0, 0, 100,100);

1: Red
2: Green
3: Yellow
4: Black
Correct Answer: 4

Question: To create DataBaseMetaData object we write following line of code

1: DataBaseMetaData db = con.getMeataData();
2: ResultSetMetaData rsmd = rs.getMetaData();
3: ResultSetMetaData rsmd = rs.setMetaData();
4: DataBaseMetaData db = con.setMeataData();
Correct Answer: 1

Question: Event source can have ——— listeners registered on it.

1: Single
2: Double
3: Triple
4: Multiple
Correct Answer: 4

Question: An abstract class ————— instantiated.

1: Can’t be
2: Can be
3: Must
4: None of these
Correct Answer: 1

Question: A ___________ defines the way and method of communication between two parties.

1: Compiler
2: Protocol
3: Tool
4: Technique
Correct Answer: 2

Question: What if the static modifier is removed from the signature of the main method?

1: The program does not compile
2: The program compiles but does not run
3: The program compiles and runs properly
4: The program throws an exception on compile time
Correct Answer: 4

Question: What if the main method is declared as private?

1: The program does not compile…
2: The program compiles but does not run
3: The program compiles and runs properly
4: The program throws an exception on compile time
Correct Answer: 2

Question: A member variable or method prefixed by the protected access modifier can be accessed:

1: Within the same class
2: Within the sub-class
3: Within the same package
4: All of the above
Correct Answer: 4

Question: A top-level class without any modifier is accessible to

1: any class
2: any class within the same package
3: any class within the same file
4: any subclass of this class
Correct Answer: 2