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Computer Science 2 Set 1 2018-2019 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

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Computer Science 2
Set 1
2018-2019 February
Marks: 50

(1) All questions are compulsory.


[10]1
[4]1.A
[1]1.A.a | Select correct options and rewrite the following :

 _____ bits of flag register of 8085 Microprocessor are unused.

1

2

3

4

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

The first bype of an 8085 instruction always contains_________

Opcode

Data

Address

None of these

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[1]1.A.c

The 8051 Micro-controller has instruction set of _______ instructions.

101

110

99

111

Concept: Introduction to Microcontroller
Chapter: [4] Introduction to Microcontroller
[1]1.A.d

________ of the following is an example of wireless media.

Optic Fibre

Microwave

UTP

STP

Concept: Networking Technology
Chapter: [5] Networking Technology
[6]1.B | Solve any two of the following:
[3]1.B.a
[1]1.B.a.i

Explain the functions of following pins of 8085 Micro Processor: 
 IO/M

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[1]1.B.a.ii

Explain the functions of following pins of 8085 Micro Processor:
RD.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[1]1.B.a.iii

Explain the functions of following pins of 8085 Micro Processor:
INTA

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[3]1.B.b | (Any 3 points)

Distinguish between LAN and WAN.

Concept: Networking Technology
Chapter: [5] Networking Technology
[3]1.B.c

State any six features of 8051 Microcontroller.

Concept: Introduction to Microcontroller
Chapter: [4] Introduction to Microcontroller
[10]2
[6]2.A | Solve any two of the following:
[3]2.A.a
[1]2.A.a.i

Explain the following

T-States

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[1]2.A.a.ii

Explain the following

Machine Cycle

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[1]2.A.a.iii

Explain the following : Instruction Cycle

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[3]2.A.b

Explain the following instructions of 8085 Microprocessor with one
example of each : INX rp

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[3]2.A.c

Explain Micro-controller and state any two of its advantages over Micro-processor.

Concept: Introduction to Microcontroller
Chapter: [4] Introduction to Microcontroller
[4]2.B | Solve any one of the following:
[4]2.B.a

Draw a neat and labelled block diagram of Micro-computer.

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[4]2.B.b

Explain in short Star Topology

Concept: Networking Technology
Chapter: [5] Networking Technology
[10]3
[6]3.A | Solve any two of the following:
[3]3.A.a
[1]3.A.a.i

Write the functions of following blocks of 8085 Micro-processor:
Accumulator

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[1]3.A.a.ii

Write the functions of following blocks of 8085 Micro-processor:
Instruction Register

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[1]3.A.a.iii

Write a function of following functional units of 8085 Microprocessor : Instruction Decoder

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[3]3.A.b
[1]3.A.b.i

Given any two instructions of following addressing mode:
Immediate

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[1]3.A.b.ii

Given any two instructions of following addressing mode:
Register Indirect

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[1]3.A.b.iii

Given any two instructions of following addressing mode:
Register

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[3]3.A.c

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

Concept: Networking Technology
Chapter: [5] Networking Technology
[4]3.B | Solve any one of the following:
[4]3.B.a
[2]3.B.a.i

Explain following network device with diagram:
Router

Concept: Networking Technology
Chapter: [5] Networking Technology
[2]3.B.a.ii

Explain following network device with diagram:
Repeater

Concept: Networking Technology
Chapter: [5] Networking Technology
[4]3.B.b

Explain memory register map of 8051 Micro-controller with diagram.

Concept: Introduction to Microcontroller
Chapter: [4] Introduction to Microcontroller
[10]4
[6]4.A | Solve any two of the following:
[3]4.A.a

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
[3]4.A.b

Explain ALU of 8085 Micro-processor with suitable diagram.

Concept: Introduction to Microprocessors and Organization of 8085
Chapter: [1] Introduction to Microprocessors and Organization of 8085
[3]4.A.c

Explain in short six characteritics of Transmission Media.

Concept: Networking Technology
Chapter: [5] Networking Technology
[4]4.B | Solve any one of the following:
[4]4.B.a

The accumulator contains AA H and register C contains 55 H. What will be the contents of accumulator if following instructions are executed independently?
i) CMP C
ii) ANA C
iii) ORA C
iv) SUB C

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[4]4.B.b

Compare any four features of 80486 and Pentium Processors.

Concept: Introdcution to Intel X-86 Family
Chapter: [3] Introdcution to Inted X-86 Family
[10]5
[10]5.A | Solve any two of the following :
[5]5.A.a

Write an Assembly Language Program to find absolute difference of two hex numbers stored in memory locations 5000H and 5001H. Store the result at 5002 H.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[5]5.A.b

Write an Assemhly Language Program to find largest number in a block of memory starting from 7000 H. The length of the block is stored at 6FFF H. Store the result at the end of the block.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[5]5.A.c

Study the following program and answer the questions given below :

Label Mnemonics /Operand
BACK MVIC,08H
LXIH,6000H
MOVA,M
RRC
DCRC
JNZBACK
INXH
MOVM,A
HLT

i) Write the purpoe of the program.
ii) Write comments for the instructions used in the program.
iii) If the input data at memory location 6000 H is FF H, then write the result along with corresponding memory location.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
OR
[10]5.B | Solve any two of the following :
[5]5.B.a

A block of data is stored in memory locations starting from 3001 H. The length of the block is at 3000 H. Write an Assembly Language Program that searches for the first occurrence of data AO H in given block. Store the address of this occurrence in H-L pair. If the number is not fou nd then H-L pair should contain 0000 H.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[5]5.B.b

A block of data is stored in memory locations starting from 3001 H. The length of the block is at 3000 H. Write an Assembly Language Program that searches for the first occurrence of data AO H in given block. Store the address of this occurrence in H-L pair. If the number is not fou nd
then H-L pair should contain 0000 H.

Concept: Instruction Set and Programming of 8085
Chapter: [2] Instruction Set and Programming of 8085
[5]5.B.c

Study the following program and answer the questions given below :

Label Mnemonics /Operand
BACK LXIH,COOOH
MOVC,M
INXH
MOVA,M
XRAA
MOV M,A
DCR C
JNZBACK
HLT

i) Write the purpose of the program.
ii) Write comments for the instructions used in the program.
iii) If the input data at memory location COOO H is 05 H, then write the result along with corresponding memory locations.

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

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