(English Medium) ICSE Class 10 - CISCE Important Questions for Computer Applications

Which of the following is an escape sequence character in Java?

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

If (a>b&&b>c) then largest number 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]?

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.

Define a class pin code and store the given pin codes in a single-dimensional array. Sort these pin codes in ascending order using the Selection Sort technique only. Display the sorted array.

110061, 110001, 110029, 110023, 110055, 110006, 110019, 110033

The size of '\n' 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));

A single dimensional array has 50 elements; which of the following is the correct statement to initialize the last element to 100?

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);

Consider the following program segment and answer the questions given below:

int x[][]={{2,4,5,6}, {5,7,8,1}, {34,2,10,9}};

1. What is the position of 34?
2. What is the result of x[2][3] + x[1][2]?

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.

Define a class to search for a value input by the user from the list of values given below. If it is found display the message "Search successful", otherwise display the message "Search element not found” using Binary search technique.

5.6, 11.5, 20.8, 43.1, 52.4, 66.6, 78.9, 80.0, 95.5.

Define a class to accept values into a 4 × 4 array and find and display the sum of each row.

Example:

A[][]={1,2,3,4),{5,6,7,8},{1,3,5,7},{2,5,3,1}}

Output:

sum of row 1=10 (1+2+3+4)

sum of row 2=26 (5+6+7+8)

sum of row 3=16 (1+3+5+7)

sum of row 4=11 (2+5+3+1)

Write a difference between unary and binary operator.