Computer Application Practice Quiz Class 10

Wrapping up of data and functions into a single unit called class is known as_____.

• Abstraction

• Inheritance

• Polymorphism

• Encapsulation

interface is a ______ datatype.

• Primitive

• Composite

Java expression for (under root of 2as+u2) is:

• Math.sqrt ( 2 * a * s + Math.pow ( u, 2 ) )

• Math.cbrt(2 x a x s) + u x 2

• Root over of 2 *a*S + u*u

• Math.sqrt ( 2 * a * s + Math.pow ( u, 2 ) );

Multiplication operator used when the operation should be division.

What kind of error is this?

• Syntax error

• Typo

• Logical error

• Run-time error

int arr[] = new int[10];

This statement declares an _____ array of _____elements.

• double, 10

• int, 10

• integer, 10

• point value, 10

What is the output?

int a = 63, b = 36;

boolean x = (a < b ) ? true : false; int y= (a > b ) ? a : b ;

• x= true , y=65

• x= true y= 63

• x= false y= 64

• x= false y=63

What will be the result stored in x after evaluating the following expression?



int x=4;

x += (x++) + (++x) + x;

• 20

• 21

• 22

• 15

State the method that:

Converts a string to a primitive float data type

• float.parsefloat()String;

• Float.parseFloat(String)

• Float.Parsefloat(String);

• Float.parseFloat(String);

What will the following code output?

String s = "malayalam";

System.out.println(s.indexOf('m'));

System.out.println(s.lastIndexOf('m'));

• 0

  8

• 0 8

• 1 7

• 1

  7

A _______ is a constant data item.

• Number

• Character literal

• Literal

• None of the above