QUIZ ON : JAVA - USING LIBRARY CLASSES

USING LIBRARY CLASSES

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Question No# : 01 out of 31

Which among the following function is used to check whether a given character is a tab space or not?

A. isTab()

B. isTabSpace()

C. isSpace()

D. isWhitespace()

Question No# : 02 out of 31

Which among the following package is imported by default:

A. java.lang

B. java.util

C. Both a and b

D. None of these

Question No# : 03 out of 31

What is the return type of Math.min(1,2.0f)?

A. float

B. double

C. int

D. long

Question No# : 04 out of 31

What package is a part of the wrapper class which is imported by default into all Java programs?

A. java.util

B. java.lang

C. java.awt

D. None of these

Question No# : 05 out of 31

Which among the following will yield -1 for negative number and 1 for positive number for a number stored in a variable a?

A. Math.abs(a)*a

B. Math.abs(a) / a

C. Math.ceil(a) / Math.floor(a)

D. None of these

Question No# : 06 out of 31

Math.max( ) returns the number having maximum number of digits.

A. TRUE

B. FALSE

Question No# : 07 out of 31

Which class is inherited by the Character and Boolean wrapper classes?

A. Object

B. Number

C. Both a and b

D. None of these

Question No# : 08 out of 31

If s=“123”, which among the following will convert it to an integer?

A. int a=Integer(s);

B. int a=(int)s;

C. int a=parseInt(s);

D. int a=Integer.parseInt(a);

Question No# : 09 out of 31

What value will Math.sqrt(Math.ceil(8.1)) return?

A. 9.0

B. 9

C. 3.0

D. 4.0

Question No# : 10 out of 31

Which among the following gives the next mathematical integer?

A. Math.floor( )

B. Math.ceil( )

C. Math.random( )

D. All of these

Question No# : 11 out of 31

It is possible to find the square root of a number using the Math.pow() function.

A. TRUE

B. FALSE

Question No# : 12 out of 31

The member ‘out’ object of the ‘System’ class belongs to which class?

A. System

B. Print

C. PrintStream

D. Println

Question No# : 13 out of 31

What value will Math.sqrt(-9) return?

A. -3.0

B. 3.0

C. NaN

D. None of these

Question No# : 14 out of 31

Which among the following expression will return a random integer between 5 and 10 both inclusive?

A. 5+(int)(Math.random()*6)

B. 5+(int)(Math.random()*10)

C. 5+Math.random()*6

D. 5+Math.random()*10

Question No# : 15 out of 31

Which among the following class do not belong to the java.lang package?

A. System

B. String

C. Math

D. Scanner

Question No# : 16 out of 31

Which among the following function returns the absolute value of a number?

A. Math.absoulute( )

B. Math.neutral( )

C. Math.abs( )

D. Math.positive( )

Question No# : 17 out of 31

Which of the following is not a wrapper class?

A. Byte

B. Int

C. Long

D. Float

Question No# : 18 out of 31

Which among the following Scanner methods allows us to input a number with a decimal point?

A. nextInt()

B. nextFloat()

C. nextDecimal()

D. nextPoint()

Question No# : 19 out of 31

Math. rint(12.5) will return 12.0.

A. TRUE

B. FALSE

Question No# : 20 out of 31

Math.random( ) returns a random number between 0 and 1 in decimal.

A. TRUE

B. FALSE

Question No# : 21 out of 31

Math.round() function returns an int value if the parameter is float data type and long value if the parameter is of double data type.

A. TRUE

B. FALSE

Question No# : 22 out of 31

Which among the following methods return a true or a false?

A. toLowerCase()

B. toUpperCase()

C. parseInt()

D. isUpperCase()

Question No# : 23 out of 31

Math.sqrt() function is used to find the square of a number.

A. TRUE

B. FALSE

Question No# : 24 out of 31

You cannot find the cube root of a number in Java.

A. TRUE

B. FALSE

Question No# : 25 out of 31

Math.abs() function is used to round off a real number to the nearest integer.

A. TRUE

B. FALSE

Question No# : 26 out of 31

Which of the following is valid method of initialising?

A. Integer a=new (5);

B. Integer a=Integer(5);

C. Integer a=new Integer(5);

D. Integer a=new (“5”);

Question No# : 27 out of 31

Which among the following is valid character initialisation?

A. Character c=new Character(‘c’);

B. Character c=new Character(“c”);

C. Both a and b

D. None of these

Question No# : 28 out of 31

NaN stands for Not a Number, which is received when you pass a negative number to the Math.sqrt() function.

A. TRUE

B. FALSE

Question No# : 29 out of 31

Which among the following function is equivalent to Math.sqrt(a)?

A. Math.cbrt(a);

B. Math.pow(a,1/2)

C. Math.pow(a,1/2.0);

D. Math.

Question No# : 30 out of 31

What is, converting a primitive value into an object of the corresponding wrapper class called?

A. Autoboxing

B. Unboxing

C. Type Casting

D. All of these

Question No# : 31 out of 31

Math.ceil() and Math.floor() are same.

A. TRUE

B. FALSE