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Computer Science 2 Official 2024-2025 HSC Science (Computer Science) 12th Standard Board Exam Question Paper Solution

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Computer Science 2 [Official]
Marks: 50 Maharashtra State Board
HSC Science (Computer Science)

Academic Year: 2024-2025
Date & Time: 6th March 2025, 11:00 am
Duration: 3h
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  1. All questions are compulsory.
  2. Figures to the right indicate full marks.
  3. Draw a neat and labelled diagram wherever necessary.
  4. Use of any type of calculator is not allowed.
  5. Comments are must in assembly language programs.

Select the correct alternative and rewrite the following:
[1]1. (A) (a)

The arithmetic instruction which affect only carry flag is ______.

DAD

ADD

ADC

SBB

Concept: undefined - undefined
Chapter:
[1]1. (A) (b)

______ is not a vector interrupt.

TRAP

INTR

RST 7.5

RST 6.5

Concept: undefined - undefined
Chapter:
[1]1. (A) (c)

The 8051 size of internal ROM is ______.

4K bytes

2K bytes

8K bytes

16K bytes

Concept: undefined - undefined
Chapter:
[1]1. (A) (d)

The conversation from digital to analog and vice versa is done by ______.

Repeater

Hub

Router

MODEM

Concept: undefined - undefined
Chapter:
Answer any two of the following:
[1]1. (B) (a) 1.

What is Microprocessor?

Concept: undefined - undefined
Chapter:
[1]1. (B) (a) 2.

Give at least two examples of 8-bits Microprocessor.

Concept: undefined - undefined
Chapter:
[1]1. (B) (a) 3.

Give at least two examples of 16-bits Microprocessor.

Concept: undefined - undefined
Chapter:
[1.5]1. (B) (b) 1.

Explain the direct addressing mode of Intel 8085 with suitable examples.

Concept: undefined - undefined
Chapter:
[1.5]1. (B) (b) 2.

Explain the immediate addressing mode of 8085 Micro-processor with examples.

Concept: undefined - undefined
Chapter:
[1.5]1. (B) (c) 1.

Explain in brief the following access method:

Contention

Concept: undefined - undefined
Chapter:
[1.5]1. (B) (c) 2.

Explain in brief the following access method:

Token Passing

Concept: undefined - undefined
Chapter:
Answer any two of the following:
[3]2. (A) (a)

Explain the function of ALU with a simple block diagram.

Concept: undefined - undefined
Chapter:
[1]2. (A) (b) (i)

Explain the following instruction of 8085 Micro-processor:

LDAX D

Concept: undefined - undefined
Chapter:
[1]2. (A) (b) (ii)

Explain the following instruction of 8085 MPU:

XCHG

Concept: undefined - undefined
Chapter:
[1]2. (A) (b) (iii)

Explain the following instruction of 8085 Micro-processor:

RAR (Consider cy = 0)

Concept: undefined - undefined
Chapter:
[1]2. (A) (c) 1.

Define Network Topology.

Concept: undefined - undefined
Chapter:
[1]2. (A) (c) 2.

Explain in short Bus Topology.

Concept: undefined - undefined
Chapter:
[1]2. (A) (c) 3.

Explain in short Ring Topology. 

Concept: undefined - undefined
Chapter:
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Answer any one of the following:
[1]2. (B) (a) (i)

Explain Accumulator.

Concept: undefined - undefined
Chapter:
[1]2. (B) (a) (ii)

Explain Program counter.

Concept: undefined - undefined
Chapter:
[1]2. (B) (a) (iii)

Explain the following register in 8085 Micro-processor:

Decoder

Concept: undefined - undefined
Chapter:
[1]2. (B) (a) (iv)

Explain the following register in 8085 Micro-processor:

General purpose register

Concept: undefined - undefined
Chapter:
[1]2. (B) (b) (i)

Explain the advantage of the following feature of the Pentium Processor:

Dual pipe lining

Concept: undefined - undefined
Chapter:
[1]2. (B) (b) (ii)

Explain the following feature of Pentium Microprocessor:

On-chip cache

Concept: undefined - undefined
Chapter:
[1]2. (B) (b) (iii)

Explain the following feature of Pentium Microprocessor:

Branch Prediction

Concept: undefined - undefined
Chapter:
[1]2. (B) (b) (iv)

Explain the following feature of Pentium Microprocessor:

64-bit data bus

Concept: undefined - undefined
Chapter:
Answer any two of the following:
[3]3. (A) (a)

List functions of Microprocessor.

Concept: undefined - undefined
Chapter:
[1]3. (A) (b) (i)
 

Explain the function of the following pin of 8085:

`"IO|" bar"M"`

 
Concept: undefined - undefined
Chapter:
[1]3. (A) (b) (ii)

Explain the function of the following pin of 8085:

HLDA

Concept: undefined - undefined
Chapter:
[1]3. (A) (b) (iii)

Explain the function of the following pin of 8085 Micro-processor:

READY

Concept: undefined - undefined
Chapter:
[1]3. (A) (c) 1.

Define Microcontroller.

Concept: undefined - undefined
Chapter:
[2]3. (A) (c) 2.

State any two of Micro-controller advantages over Micro-processor.

Concept: undefined - undefined
Chapter:
Answer any one of the following:
[4]3. (B) (a)

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

Concept: undefined - undefined
Chapter:
[1]3. (B) (b) 1.

What is meant by protocol?

Concept: undefined - undefined
Chapter:
[4]3. (B) (b) 2.

Explain the concept of TCP/IP Protocol.

Concept: undefined - undefined
Chapter:
Answer any two of the following:
[1]4. (A) (a) 1.

What do you mean by Interrupt?

Concept: undefined - undefined
Chapter:
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[1]4. (A) (a) 2.

Explain Maskable Interrupts.

Concept: undefined - undefined
Chapter:
[1]4. (A) (a) 3.

Explain Non-maskable Interrupts.

Concept: undefined - undefined
Chapter:
[1]4. (A) (b) (i)

Accumulator contains data ABH and register D contains the data 09H. What will be the content of the accumulator after execution of the following instruction:

XRA D

Concept: undefined - undefined
Chapter:
[1]4. (A) (b) (ii)

Accumulator contains data ABH and register D contains the data 09H. What will be the content of the accumulator after execution of the following instruction:

ADD D

Concept: undefined - undefined
Chapter:
[1]4. (A) (b) (iii)

Accumulator contains data ABH and register D contains the data 09H. What will be the content of the accumulator after execution of the following instruction:

ORI 55H

Concept: undefined - undefined
Chapter:
[3]4. (A) (c)

Explain the structure of Fiber Optic Cable.

Concept: undefined - undefined
Chapter:
Answer any one of the following:
[1]4. (B) (a) 1.

What is Flag Register?

Concept: undefined - undefined
Chapter:
[3]4. (B) (a) 2.

Explain any four flags of 8085, giving example.

Concept: undefined - undefined
Chapter:
[1]4. (B) (b) (i)

Explain in short six characteritics of Transmission Media.

Concept: undefined - undefined
Chapter:
[1]4. (B) (b) (ii)

Explain in short six characteritics of Transmission Media.

Concept: undefined - undefined
Chapter:
[1]4. (B) (b) (iii)

Explain in short six characteritics of Transmission Media.

Concept: undefined - undefined
Chapter:
[1]4. (B) (b) (iv)

Explain in short six characteritics of Transmission Media.

Concept: undefined - undefined
Chapter:
Answer any two of the following:
[5]5. (a)

A block of data stored in memory location from 2600H to 2609H. Write Assembly Language Program to transfer to data block in reverse order starting from memory location 2700H.

Concept: undefined - undefined
Chapter:
[5]5. (b)

A block of data stored in memory location 3100H and length of the block is stored at 3000H. Write Assembly Language Program to count the data BBH appeared in the given block. Store the count of the memory location at 3100H.

Concept: undefined - undefined
Chapter:
[5]5. (c)

Write an Assembly Language Program to find out 2’s complements of five numbers which are stored in memory locations starting from 4100H and stored the result in memory location starting from 4200H.

Concept: undefined - undefined
Chapter:
OR
Answer any two of the following:
[5]5. (a)

A 8-bit number stored in memory location BABA H. Write an Assembly Language Program to add each bit of the given 8-bit number and store the resect at memory location.

Concept: undefined - undefined
Chapter:
[5]5. (b)

Write an Assembly Language Program to divide Hexa decimal number stored in the memory location 5000H by Hexa decimal number stored in memory location 5001H. Store the quotient at 5002H and remainder at 5003H.

Concept: undefined - undefined
Chapter:
[5]5. (c)

Write an Assembly Language Program to generate the Fibonacci number upto 5 terms.(Fibonacci terms – 00H, 01H, 01Н, 02Н, 03H)

Concept: undefined - undefined
Chapter:

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