R4RIN – MCQs, Mock Tests | Java Java Mcq Question Set 7

What is the default value of priority variable MIN_PRIORITY AND MAX_PRIORITY?

1. 0 & 1
2. 1 & 10
3. 0 & 256
4. 1 & 256

✅ Correct Answer: 2

Which of these method waits for the thread to treminate?

1. isAlive()
2. stop()
3. sleep()
4. join()

✅ Correct Answer: 4

Which of these method is used to explicitly set the priority of a thread?

1. setPriority()
2. makePriority()
3. set()
4. make()

✅ Correct Answer: 1

What is synchronization in reference to a thread?

1. Its a method that allow to many threads to access any information require.
2. Its a process by which a method is able to access many different threads simultaneously.
3. Its a process by which many thread are able to access same shared resource simultaneously.
4. It's a process of handling situations when two or more threads need access to a shared resource.

✅ Correct Answer: 4

Which of these method is used to implement Runnable interface?

1. runThread()
2. stop()
3. run()
4. stopThread()

✅ Correct Answer: 3

Which of these interface is implemented by Thread class?

1. Set
2. Runnable
3. MapConnections
4. Connections

✅ Correct Answer: 2

Which of these method is used to begin the execution of a thread?

1. startThread()
2. runThread()
3. run()
4. start()

✅ Correct Answer: 4

Which of these method waits for the thread to treminate?

1. sleep()
2. join()
3. stop()
4. isAlive()

✅ Correct Answer: 1

Which of these statement is incorrect?

1. A thread can be formed by a class that extends Thread class.
2. start() method is used to begin execution of the thread.
3. run() method is used to begin execution of a thread before start() method in special cases.
4. A thread can be formed by implementing Runnable interface only.

✅ Correct Answer: 3

Which of these class is used to make a thread?

1. Thread
2. System
3. Runnable
4. String

✅ Correct Answer: 1

Which of these method of Thread class is used to find out the priority given to a thread?

1. get()
2. getPriority()
3. getThreadPriority()
4. ThreadPriority()

✅ Correct Answer: 2

Which of these method of Thread class is used to Suspend a thread for a period of time?

1. terminate()
2. sleep()
3. suspend()
4. stop()

✅ Correct Answer: 2

Which function of pre defined class Thread is used to check weather current thread being checked is still running?

1. isRunning()
2. Alive()
3. Join()
4. isAlive()

✅ Correct Answer: 4

What is multithreaded programming?

1. Its a process in which many different process are able to access same information.
2. Its a process in which a single process can access information from many sources.
3. It's a process in which two different processes run simultaneously.
4. It's a process in which two or more parts of same process run simultaneously.

✅ Correct Answer: 4

Which of these are types of multitasking?

1. Thread based
2. Process based
3. Process and Thread based
4. None

✅ Correct Answer: 3

Which of these packages contain all the Java's built in exceptions?

1. java.util
2. java.lang
3. java.io
4. java.net

✅ Correct Answer: 2

Thread priority in Java is?

1. Integer
2. long
3. double
4. Float

✅ Correct Answer: 1

What will happen if two thread of same priority are called to be processed simultaneously

1. Both of them will be executed simultaneously
2. Any one will be executed first lexographically
3. It is dependent on the operating system.
4. None of them will be executed

✅ Correct Answer: 3

Which of these statements is incorrect?

1. By multitasking CPU's idle time is minimized, and we can take maximum use of it.
2. By multithreading CPU's idle time is minimized, and we can take maximum use of it.
3. Two thread in Java can have same priority
4. A thread can exist only in two states, running and blocked.

✅ Correct Answer: 4

Which of the following can be operands of arithmetic operators?

1. Characters
2. Boolean
3. Both Boolean & Characters
4. Numeric

✅ Correct Answer: 3

Modulus operator, %, can be applied to which of these?

1. Integers
2. Floating � point numbers
3. Both Integers and floating � point numbers.
4. None

✅ Correct Answer: 3

With x = 0, which of the following are legal lines of Java code for changing the value of x to 1? 1. x++; 2. x = x + 1; 3. x += 1; 4. x =+ 1;

1. 3 & 2
2. 1 & 4
3. 1, 2 & 3
4. 1, 2, 3 & 4

✅ Correct Answer: 1

Decrement operator, , decreases value of variable by what number?

1. 1
2. 2
3. 3
4. 4

✅ Correct Answer: 1

Which of these statements are incorrect?

1. Assignment operators can be used only with numeric and character data type.
2. Assignment operators run faster than their equivalent long forms.
3. Assignment operators are more efficiently implemented by Java run-time system than their equivalent long forms.
4. None

✅ Correct Answer: 4

Output : class increment { public static void main(String args[]) { double var1 = 1 + 5; double var2 = var1 / 4; int var3 = 1 + 5; int var4 = var3 / 4; System.out.print(var2 + " " + var4); } }

1. 0 1
2. 1.5 1
3. 1 1
4. 1.5 1.0

✅ Correct Answer: 2

Output : class Modulus { public static void main(String args[]){double a = 25.64; int b = 25; a = a % 10; b = b % 10; System.out.println(a + " " + b); } }

1. 5.640000000000001 5
2. 5 5
3. 5.640000000000001 5.0
4. 5 5.640000000000001

✅ Correct Answer: 1

Output : class increment { public static void main(String args[]) {int g = 3; System.out.print(++g * 8); } }

1. 26
2. 30
3. 32
4. 36

✅ Correct Answer: 3

Output : class Output { public static void main(String args[]){ int x , y; x = 10; x++; --x; y = x++; System.out.println(x + " " + y); } }

1. 11 13
2. 11 12
3. 11 11
4. 11 10

✅ Correct Answer: 4

Which operator is used to invert all the digits in binary representation of a number?

1. >>>
2. ~
3. ^
4. None

✅ Correct Answer: 2

On applying Left shift operator, <<, on an integer bits are lost one they are shifted past which position bit?

1. 31
2. 32
3. 33
4. 34

✅ Correct Answer: 1

Which right shift operator preserves the sign of the value?

1. >>
2. >>=
3. Both (a) and (b)
4. None

✅ Correct Answer: 1

Which of these statements are incorrect?

1. The left shift operator can be used as an alternative to multiplying by 2.
2. The right shift operator automatically fills the higher order bits with 0.
3. The left shift operator, <<, shifts all of the bite in a value to the left specified number of times.
4. The right shift operator, >>, shifts all of the bite in a value to the right specified number of times.

✅ Correct Answer: 2

What is the output of relational operators?

1. Boolean
2. Integer
3. Double
4. Characters

✅ Correct Answer: 1

Which of these is returned by greater than, <, and equal to, ==, operator?

1. Integers
2. Boolean
3. Floating - point numbers
4. None

✅ Correct Answer: 2

Which of the following operators can operate on a boolean variable?

1. &&
2. ==
3. ?:
4. All of these

✅ Correct Answer: 4

Which of these operators can skip evaluating right hand operand?

1. &&
2. &
3. !
4. |

✅ Correct Answer: 1

Which of these statement is correct?

1. true is any non zero value and false is 0.
2. true and false are non numeric values.
3. true and false are numeric values 0 and 1.
4. true and false are numeric values 1 and 0.

✅ Correct Answer: 2

Which of these have highest precedence?

1. *
2. >>
3. ()
4. ++

✅ Correct Answer: 3

What should be expression1 evaluate to in using ternary operator as in this line? expression1 ? expression2 : expression3

1. Boolean
2. Integer
3. Floating point numbers
4. None

✅ Correct Answer: 1

What is the value stored in x in following lines of code? int x, y, z; x = 0; y = 1; x = y = z = 8;

1. 6
2. 9
3. 12
4. None

✅ Correct Answer: 2

What is the order of precedence (highest to lowest) of following operators? 1. & 2. ^ 3. ?:

1. 3 -> 2 -> 1
2. 2 -> 3 -> 1
3. 2 -> 1 -> 3
4. 1 -> 2 -> 3

✅ Correct Answer: 4

Which of these statements are incorrect?

1. Brackets () have highest precedence.
2. Addition operator, +, and subtraction operator have equal precedence.
3. Equal to operator has least precedence.
4. Division operator, /, has higher precedence than multiplication operator.

✅ Correct Answer: 4

Which of these operators is used to allocate memory to array variable in Java?

1. new malloc
2. malloc
3. new
4. alloc

✅ Correct Answer: 3

Which of these is an incorrect array declaration?

1. int arr[] = int [5] new
2. int arr[] = new int[5]
3. int arr[]arr = new int[5]
4. int [] arr = new int[5]

✅ Correct Answer: 1

What will this code print? int arr[] = new int [5]; System.out.print(arr);

1. 0
2. 0
3. Garbage value
4. value stored in arr[0].

✅ Correct Answer: 3

Which of these is an incorrect Statement?

1. Array can be initialized using comma separated expressions surrounded by curly braces.
2. It is necessary to use new operator to initialize an array.
3. Array can be initialized when they are declared.
4. None

✅ Correct Answer: 2

Which of these is necessary to specify at time of array initialization?

1. Row
2. Column
3. Both Row and Column
4. None

✅ Correct Answer: 1

When does Exceptions in Java arises in code sequence?

1. Compilation Time
2. Run Time
3. Can Occur Any Time
4. None

✅ Correct Answer: 2

Which of these keywords is not a part of exception handling?

1. finally
2. catch
3. try
4. thrown

✅ Correct Answer: 4

Which of these keywords must be used to monitor for exceptions?

1. catch
2. try
3. finally
4. throw

✅ Correct Answer: 2