HSC Science (Computer Science) 12th Board ExamMaharashtra State Board
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Computer Science 2 2015-2016 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

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Computer Science 2
2015-2016 March
Marks: 50

[10]1
[4]1.1 | Select the correct alternative and rewrite :
[1]1.1.1

.............is a Micro-controller.
(i) 8086
(ii) 8051
(iii) 8088
(iv) 80286

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[1]1.1.2

..............instruction does not affect the Flag.
(i) RAR
(ii) CMP C
(iii) XRA
(iv) MOV A,B

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[1]1.1.3

If length of cable is very long then ................ is used in between to bring the weakend signal to its original level.
(i) MODEM
(ii) HUB
(iii) REPEATER
(iv) ROUTER

Concept: Networking Technology
Chapter: [5] Networking Technology
[1]1.1.4

.....................instruction is used for 16-bit addition.
(i) ADD
(ii) ADI
(iii) ADC
(iv) DAD

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[6]1.2 | Answer any two of the following :
[3]1.2.1

Differentiate between Micro-controller and a Micro-processor

 

Concept: Introduction to Microcontroller
Chapter: [4] Introduction to Microcontroller
[3]1.2.2

Explain Accumulator.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085

Explain Program counter.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085

Explain Stack pointer (SP).

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[3]1.2.3

Write a short note on MODEM.

Concept: Networking Technology
Chapter: [5] Networking Technology
[10]2
[6]2.1 | Answer any two :
[3]2.1.1

Explain the function of following pins of 8085
(i) HLDA
(ii) SID
(iii) READY

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[3]2.1.2

Discuss in brief the members of X-86 Family begining from 80386 and upwards.

Concept: Introdcution to Intel X-86 Family
Chapter: [3] Introdcution to Inted X-86 Family
[3]2.1.3

Draw the memory register map of Micro-controller 8051.

Concept: Introduction to Microcontroller
Chapter: [4] Introduction to Microcontroller
[4]2.2 | Answer any one :
[4]2.2.1

Draw the labelled internal block diagram of 8085 Microprocessor

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[4]2.2.2

Explain in brief programming model of X-86 Family.

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[10]3
[6]3.1 | Answer any two :
[3]3.1.1

Explain any three Addressing Modes of 8085 with examples.

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[3]3.1.2

Explain in short Star Topology

Concept: Networking Technology
Chapter: [5] Networking Technology

Explain in short Bus Topology

Concept: Networking Technology
Chapter: [5] Networking Technology

 Explain in short Ring Topology.

Concept: Networking Technology
Chapter: [5] Networking Technology
[3]3.1.3

Distinguish between LAN and WAN.

Concept: Networking Technology
Chapter: [5] Networking Technology
[4]3.2 | Answer any one :
[4]3.2.1

What is an Vectored Interrupt? 

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085

State the different hardware interrupts with their priorities and branching addresses.

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[4]3.2.2

Explain the advantages of following features of Pentium Processor
(i) Dual - Pipelining
(ii) Pre fetching
(iii) Branch Prediction
(iv) Internal Data Bus

Concept: Introdcution to Intel X-86 Family
Chapter: [3] Introdcution to Inted X-86 Family
[10]4
[6]4.1 | Answer any two :
[3]4.1.1

What is a Protocol ? Explain the concept of TCP/IP Protocol.

Concept: Networking Technology
Chapter: [5] Networking Technology
[3]4.1.2

Explain the structure of Fiber Optic Cable.

Concept: Networking Technology
Chapter: [5] Networking Technology
[3]4.1.3

Draw the labelled diagram of X-86 farilily Flag Register.

Concept: Introdcution to Intel X-86 Family
Chapter: [3] Introdcution to Inted X-86 Family
[4]4.2 | Answer any one :
[4]4.2.1

Write an Assembly Language Program to multiply a number stored at location 1050 with a nunber at location 1051. Result is 2-byte. Store result at locations 1052 and 1053.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085

Discuss the Micro-controllers in 8051 family.

Concept: Introduction to Microcontroller
Chapter: [4] Introduction to Microcontroller
[4]4.2.2

Write a note on Ethernet.

Concept: Networking Technology
Chapter: [5] Networking Technology
[10]5
[10]5.1 | Answer any two :
[5]5.1.1

Write an Assembly Language Program to multiply a number stored at location 1050 with a nunber at location 1051. Result is 2-byte. Store result at locations 1052 and 1053.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[5]5.1.2

Write an Assembly Language program to transfer a block of memory starting from 1050H to 1059H to a new location starting from 1070H to 1079H.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[5]5.1.3

A two byte number is stored at location COOO H and COOl H. Write on Assembly Language Program to rotate this number to left side by 3 places and store the rotated number in BC register pair.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[10]5.2 | Answer any two :
[5]5.2.1

Write an Assembly Lariguage Program to add 2 decimal numbers stored at 1050 H and 1051 H.· Store result at 1052 H and 1053 H.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[5]5.2.2

Accumulator contents of 8085 are B7H and register B contents are A5H.What will be the effect of following instructions on the. contents of  Accumulator, when executed independently ?
(i) ADI 05
(ii) CMP B
(iii) CMA
(iv) XRA B
(v) ORA B

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[5]5.2.3

Write an Assembly Langilage Program to increment the contents of alternate memory locations each by two from 1051 H to 1060 H.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085

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