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When Every Child Matters!

The Global Classroom carries the unique GEMS “Dynamic” materials and assessments of Dr Sunita Gandhi, Ph.D. Cambridge University, UK. These have been tested and tried in three countries, Iceland, India and the UK, and perfected with a three year trial with over 40,000 children in India participating.

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Covering Chapters
1.	Arrays	13.	Scope and Visibility
2.	Inheritance	14.	Conditional Statements
3.	Library Classes	15.	Looping
4.	Functions	16.	File Handling
5.	Boolean Algebra and Computer	17.	Strings
6.	Hardware	18.	Errors-Exception Handling
7.	Data Structures	19.	Objects and Classes
8.	Computer Hardware	20.	Encapsulation and Visibility
9.	OOP Concepts	21.	Recursive Functions
10.	Basic Concepts of C++	22.	Recursive Data Structures
11.	Data Types	23.	Programming
12.	Encapsulation

Questions

Questions 6 (i)	Marks [6]
What is encoder? Draw the circuit diagram for decimal to binary encoder.
Questions 6 (ii)	Marks [4]
What is multiplexer? Why is multiplexer called as data selector? Write any two applications of multiplexer.

Questions 7 (i)	Marks [4]
Why are NAND and NOR gates called as universal gates? Draw and OR gates using only (a) NAND gate (b) NOR gate.[5]

Questions 11	Marks [10]
A class compress has been defined to remove all the duplicate character in a sequence by its single occurrence. Some of the members of the class are:
Classname: compress. Data member: char s[ ] to store the string. Member functions: compress( ) constructor to accept the string. int findlength() d the number of characters present in the string. void remove_duplicate( ) to replace the duplicate character in sequence by its single occurrence. void display ( ) to print the string.

For example for the input “Suppose bubble balloon is successful 2222 times”The output will be “Supose buble balon is sucesful 2 times”.
Notice sequence occurrence of spaces has also been replaced by single space

Write the code for class compress giving details of constructor, int findlength( ), void remove_duplicate( ) and void display ( ). Assume that the string will not be of more than 100 characters.

Solutions Tips and Guidelines

Solution (c)

Encoder :
The logic circuit that converts signals from one type to another is called as encoder. For example decimal to binary encoder converts decimal number to their binary equivalents.Circuit diagram for decimal to binary encoder is :

Tips / Guidelines :
(1)	The definition and working of combinational circuit must be understood.
(2)	The method to determine the number of output line for encoder is 2n must be >= I, Where I is the total numbers to be encoded and n is the number of output lines.
(3)	The diagram of the various types of encoder must be understood, learned and practiced.

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•	UK GCSE Mock Papers for Mathematics

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