(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Computer Applications

Define a class to declare an array of size 20 of the double datatype, accept the elements into the array and perform the following:

• Calculate and print the sum of all the elements.
• Calculate and print the highest value of the array.

If the name of the class is "Yellow", what can be the possible name for its constructors?

If (a>b&&b>c) then largest number is ______.

Identify the operator that gets the highest precedence while evaluating the given expression:

a + b % c * d - e

Which of the following is a valid java keyword?

The output of the following code is ______.

System.out.println(Math.ceil(6.4)+Math.floor(-1-2));

The default value of a boolean variable is ______.

A student executes the following code to increase the value of a variable 'x' by 2.

He has written the following statement, which in incorrect.

x=+2;

What will be the correct statement?

1. x+=2;
2. x=2
3. x=x+2;

Consider the following program segment in which the statements are jumbled, choose the correct order of statements to swap two variables using the third variable.

void swap(int a, int b)
{       a=b;      -> (1)
        b=t;           -> (2)
        int t=0;  -> (3)
        t=a;      -> (4) 
}

Evaluate the given expression when the value of a=2 and b=3

b*=a++-++b+ ++a;
System.out.println("a="+a);
System.out.println("b="+b);

Define a class with the following specifications:

Class name: Bank

Member variables:

double p - stores the principal amount

double n - stores the time period in years

double r - stores the rate of interest

double a - stores the amount

member methods:

void accept () - input values for p and n using Scanner class methods only.

void calculate () - calculate the amount based on the following conditions:

`a = p (1+r/100)^n`

void display () - display the details in the given format.

Write the main method to create an object and call the above methods.

State a difference between call by value and call by reference. 

Missing a semicolon in a statement is what type of error?

The number of bits occupied by the value 'a' is ______.

When an object of a Wrapper class is converted to its corresponding primitive data type, it is called as ______.

The number of bytes occupied by a character array of four rows and three columns is ______.

Consider the following two-dimensional array and answer the questions given below:

int x[ ][] = {{4,3,2}, {7,8,2}, {8,3,10}, {1,2,9}};

1. What is the order of the array?
2. What is the value of x [0] [0] + x [2] [2]?

Differentiate between boxing and unboxing.

Primitive data types are built in data types which are a part of the wrapper classes. These wrapper classes are encapsulated in the java.lang package. Non primitive datatypes like Scanner class are a part of the utility package for which an object needs to be created.

1. To which package the Character and Boolean classes belong?
2. Write the statement to access the Scanner class in the program.

The statement that brings the control back to the calling method is ______.