core java multiple choice questions Mcqs practice questions

41. What is output System.out.println(12/0.0);.

A. Infinity 
B. Divide by zero Exception 
C. NaN 
D. Compile time error 

42. What is the return type of method round(double) of Math Class?.

A. short 
B. int 
C. double 
D. long 

43. Which of the following classes do not extend the java.lang.Number class?.

A. a.java.lang.Float 
B. b.java.lang.Byte 
C. c.java.lang.Character 
D. d.java.lang.Short 

44. Which statement is true?.

A. The compiler will fail to compile code that explicitely tries to call the finalize() method 
B. The finalize() method must be declared with protected accessibility 
C. An overriding finalize() method in any class can always checked exceptions 
D. The finalize() method can be overloaded 

45. What will be output of following int tooSmall = Integer.MIN_VALUE – 1.

A. 2147483647 
B. -2147483648 
C. Will give compile error 
D. none of the above 

46. Which of the following method is used to create a thread?.

A. run() 
B. yield() 
C. start() 
D. create() 

47. Inserialization object is stored in form of?.

A. byte 
B. character 
C. string 
D. all  

48. A package is a collection of .

A. Classes 
B. interfaces 
C. editing tools 
D. classes and interfaces 

49. Which of the following defines a legal abstract class?.

A. class Vehicle { abstract void display(); } 
B. abstract Vehicle { abstract void display(); } 
C. abstract class Vehicle { abstract void display(); } 
D. class abstract Vehicle { abstract void display( ); } 

50. Which of the following may have null value?.

A. collection 
B. List 
C. Map 
D. Set 

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