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ISC Class XII Prelims 2020 : Commercial Studies (Ryan International School ICSE (RIS), Malad, Mumbai)

11 pages, 13 questions, 1 questions with responses, 1 total responses,

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COMPUTER SCIENCE (868) Aims (Conceptual) (1) To understand algorithmic problem solving using data abstractions, functional and procedural abstractions, and object based and object-oriented abstractions. (3) To create awareness of ethical issues related to computing and to promote safe, ethical behavior. (2) To understand: (a) how computers represent, store and process data at different levels of abstraction that mediate between the machine and the algorithmic problem solving level and (b) how they communicate with the outside world. Aims (Skills) (4) To make students aware of future trends in computing. To devise algorithmic solutions to problems and to be able to code, validate, document, execute and debug the solution using the Java programming system. CLASS XI bases using English or pseudo code. These algorithms are also good examples for defining different functions in a class modelling numbers (when programming is discussed). For addition and subtraction (1 s complement and 2 s complement) use the analogy with decimal numbers, emphasize how carry works (this will be useful later when binary adders are discussed). There will be two papers in the subject: Paper I: Theory .. 3 hours 70 marks Paper II: Practical . 3 hours 30 marks PAPER I THEORY 70 MARKS Paper I shall be of 3 hours duration and be divided into two parts. 2. Encodings Part I (20 marks): This part will consist of compulsory short answer questions, testing knowledge, application and skills relating to the entire syllabus. (a) Binary encodings for integers and real numbers using a finite number of bits (signmagnitude, 2 s complement, mantissaexponent notation). Part II (50 marks): This part will be divided into three Sections, A, B and C. Candidates will be required to answer two questions out of three from Section A (each carrying 10 marks) and two questions out of three from Section B (each carrying 10 marks) and two questions out of three from Section C (each carrying 5 marks). Therefore, a total of six questions are to be answered in Part II. Signed, unsigned numbers, least and most significant bits. Sign-magnitude representation and its shortcomings (two representations for 0, addition requires extra step); two s-complement representation. Operations (arithmetic, logical, shift), discuss the basic algorithms used for the arithmetic operations. Floating point representation: normalized scientific notation, mantissaexponent representation, binary point (discuss trade-off between size of mantissa and exponent). Single and double precision. SECTION A Basic Computer Hardware and Software 1. Numbers (b) Characters and their encodings (e.g. ASCII, ISCII, Unicode). Representation of numbers in different bases and interconversion between them (e.g. binary, octal, decimal, hexadecimal). Addition and subtraction operations for numbers in different bases. Discuss the limitations of the ASCII code in representing characters of other languages. Discuss the Unicode representation for the local language. Java uses Unicode, so strings in the local language can be used (they can be Introduce the positional system of representing numbers and the concept of a base. Discuss the conversion of representations between different 236

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