Class 10 String Handling Mock Test (ICSE)

Topics in String Handling

• String class methods: length, charAt, indexOf, substring
• compareTo, equals and equalsIgnoreCase
• toUpperCase, toLowerCase, trim, replace
• String concatenation
• Programs on words, palindromes and character frequency

String Handling practice questions with answers

1. Q1Multiple choice·1 mark
   What is the output of the expression given below? " ICSE Java ".trim().length();

   1. (a)13
   2. (b)11
   3. (c)10
   4. (d)9
   Show answer and step marks

   1. Correct option: (d) 9+1

   Answer: (d)
2. Q2Multiple choice·1 mark
   What will be the output of the following statement? System.out.println(10 + 20 + "Java" + 10 + 20);

   1. (a)1020Java30
   2. (b)30Java1020
   3. (c)30Java30
   4. (d)1020Java1020
   Show answer and step marks

   1. Correct option: (b) 30Java1020+1

   Answer: (b)
3. Q3Multiple choice·1 mark
   What will be the output of the following statement? System.out.println("Computer".compareTo("Computers"));

   1. (a)8
   2. (b)-1
   3. (c)1
   4. (d)0
   Show answer and step marks

   1. Correct option: (b) -1+1

   Answer: (b)
4. Q4Multiple choice·1 mark
   Which of the following expressions correctly checks if a string variable str contains the character 'a' or 'A'?

   1. (a)str.contains('a')
   2. (b)str.search('a')
   3. (c)str.indexOf('a') ≥ 0 || str.indexOf('A') ≥ 0
   4. (d)str.indexOf("a", "A") ≠ -1
   Show answer and step marks

   1. Correct option: (c) str.indexOf('a') ≥ 0 || str.indexOf('A') ≥ 0+1

   Answer: (c)
5. Q5Long answer·4 marks
   Write a program in Java to accept a sentence from the user. Convert the sentence to uppercase. Count and display the frequency of each vowel ($A$, $E$, $I$, $O$, $U$) present in the sentence using string handling methods.
   Show answer and step marks

   1. Importing Scanner class, creating the class and main method, and accepting the sentence.+1
   2. Converting the string to uppercase and setting up variables/counters for each vowel.+1
   3. Using a loop with charAt() and conditional statements to correctly count the frequency of each vowel.+1
   4. Displaying the frequency of each vowel with proper output messages.+1

   Answer: import java.util.Scanner; class Vowels { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String s = sc.nextLine().toUpperCase(); int a = 0, e = 0, i = 0, o = 0, u = 0; for (int k = 0; k < s.length(); k++) { char c = s.charAt(k); if (c == 'A') a++; else if (c == 'E') e++; else if (c == 'I') i++; else if (c == 'O') o++; else if (c == 'U') u++; } System.out.println("A = " + a + ", E = " + e + ", I = " + i + ", O = " + o + ", U = " + u); } }

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