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Computer Science 2 2017-2018 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

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Computer Science 2
2017-2018 March
Marks: 50

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

Intel 8085 is a/an ______ bit Microprocessor

(i) 16

(ii) 4

(iii) 8

(iv) 32

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

The instruction PCHL belongs to _______ group.

(i) Data transfer

(ii) Logical

(iii) Arithmetic

(iv) Branching

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

Stack pointer of 8085 holds _________.

(i) 8 bit address

(ii) 16 bit data

(iii) 16 bit address

(iv) 8 bit data

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[1]1.1.4

The instruction set of intel 8051 Micro-controller contains total _________ instruction.

(i) 111

(ii) 72

(iii) 74

(iv) 100

Concept: Introduction to Microcontroller
Chapter: [4] Introduction to Microcontroller
[6]1.2
[3]1.2.1

Explain the given function of pins on Intel 8085

`bar(RD)`

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

Explain the given function of pins on Intel 8085

`bar(WR)`

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

Explain the given function of pins on Intel 8085

IO/`barM`

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[3]1.2.2

Explain direct and immediate addressing modes of Intel 8085 with suitable examples.

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[3]1.2.3

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]2
[6]2.1
[3]2.1.1

Write the RAM and ROM size of 8048, 8049 and 8050 Microcontrollers

Concept: Introduction to Microcontroller
Chapter: [4] Introduction to Microcontroller
[3]2.1.2

Explain the structure of Fiber Optic Cable.

Concept: Networking Technology
Chapter: [5] Networking Technology
[3]2.1.3

Explain the conditional CALL instructions of Intel 8085.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[4]2.2 | Answer any one of the following
[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 the following access method :

Contention

Concept: Networking Technology
Chapter: [5] Networking Technology

Explain in brief the following access method:

Token Passing

Concept: Networking Technology
Chapter: [5] Networking Technology
[10]3
[6]3.1 | Answer any two of the following
[3]3.1.1

What do you mean by Interrupt?

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

List all the software interrupts of Intel 8085.

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

The Registers A and C of 8085 contain the data E2H and 47H. What will be the contents of Accumulator in Hex digits after execution of each of the following instructions independently?

1) SUB C

2) XRA C

3) ADD C

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[3]3.1.3

Draw a bit pattern of flag register of Intel 8085 and write the functions of any four flags.

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[4]3.2 | Answer any one of the following :
[4]3.2.1

Explain in brief the following connectivity devices :

Repeater

Concept: Networking Technology
Chapter: [5] Networking Technology

Explain in brief the following connectivity devices:

Router

Concept: Networking Technology
Chapter: [5] Networking Technology
[4]3.2.2

Explain the following

Machine Cycle

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

Explain the following : Instruction Cycle

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

Explain the following

T-States

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[10]4
[6]4.1 | Answer any two of the following
[3]4.1.1

Explain the function of following instructions of Intel 8085:

L x I H, 2900 H

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

Explain the function of following instructions of Intel 8085 :

LDA 6605 H

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

Explain the function of following instructions of Intel 8085 :

PUSH B

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[3]4.1.2

Explain the function of ALU with a simple block diagram.

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[3]4.1.3

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

Concept: Networking Technology
Chapter: [5] Networking Technology
[4]4.2 | Answer any one of the following
[4]4.2.1

What is Microcontroller?

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

State any six features of 8051 Microcontroller.

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

 Explain in short Ring Topology.

Concept: Networking Technology
Chapter: [5] Networking Technology

Explain in short Star Topology

Concept: Networking Technology
Chapter: [5] Networking Technology
[10]5 | Attempt Any One
[10]5.1 | Answer any two of the following
[5]5.1.1

Write an Assembly Language Program to multiply an 8-bit number stored at 4301H by another 8- bit number stored at 4302H. Store the result at the location 4303H and 4304H beginning with a LOB. (Lower Order Byte)

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 fill in the memory locations starting from 6900H an onward with the decimal numbers 0 to 99.

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

Write an Assembly Language Program to take the 2's complement of an 8-bit number stored at 3301H. Store the result at the memory location 3302H

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

Write an Assembly Language Program to count the occurrence of the data byte ACH in a memory Nock stored from 7401H to 7405H. Store the count at the memory location 7406H.

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

Write a subroutine in assembly language to fill the memory locations 7301H to 73FFH with the hexadecimal numbers 01H to FFH respectively

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

Write an Assembly Language Program to count the total number of even data bytes occurring in a block of data stored from 9201H to 920AH. Store the result (count) at the memory location 9500H.

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

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