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BSNL TTAs old questions and answers upto 2008
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Answer Posted / krishna29raj
1. A 32-bit processor has
(a) 32 registers
(b) 32 I/O devices
(c) 32 Mb of RAM
(d) a 32-bit bus or 32-bit registers
2. Clock speed is measured in
(a) bits per second
(b) Hertz
(c) bytes
(d) baud
3. A 20-bit address bus allows access to a memory of
capacity
(a) 1 MB
(b) 2 MB
(c) 4 MB
(d) 8 MB
4. A microprocessor contains
(a) most of RAM
(b) most of ROM
(c) peripheral drivers
(d) most of the control and arithmetic logic functions of
Computer
5. Which of the following is NOT a type of processor?
(a) PowerPC
(b) Motorola 8086
(c) Motorola 68000
(d) Intel Pentium
6. If interrupt arrives on the three lines INTR, RTS 6.5
and RTS 7.5, which of them will the 8085 processor
acknowledge?
(a) INTR
(b) RTS 6.5
(c) RTS 7.5
7. The Intel 8086 processor is
(a) 8-bit
(b) 16-bit
(c) 32-bit
(d) 64-bit
8. An assembly language instruction
(a) always has a label
(b) always takes at least one operand
(c) always has an operation field
(d) always modifies the status register
9. An interrupt instruction
(a) causes an unconditional transfer of control
(b) causes a conditional transfer of control
(c) modifies the status register
(d) is an I/O instruction
10. Programs are written in assembly language because they
(a) run faster than High-level language
(b) are portable
(c) easier to write than machine code programs
(d) they allow the programmer access to registers or
instructions that are not usually provided by a High-level
language
11. Given that the subprogram putc displays the character
in al, the effect of the following instruction is -
mov al, ‘c’
sub al, 2
call putc
(a) display 2
(b) display ‘c’
(c) display ‘a’
(d) display a blank
12. The result of mov al, 65 is to store
(a) store 0100 0010 in al
(b) store 42H in al
(c) store 40H in al
(d) store 0100 0001 in al
13. Microprocessor is also often called a
(a) Chip
(b) Resistor
(c) Capacitor
(d) Transistor
14. A microprocessor’s program counter has
(a) the digital value of the data
(b) the address of an instruction
(c) the address of data
15. Which of the following is a math co-processor?
(a) 8085
(b) 8086
(c) 8087
(d) 8088
16. Interrupts are classified as
(a) Hardware interrupts
(b) Software interrupts
(c) Hardware interrupts and Software interrupts
(d) none of the above
17. The system bus is made up of
(a) data bus
(b) data bus and address bus
(c) data bus and control bus
(d) data bus, control bus and address bus
18. The memory address register is used to store -
(a) data to be transferred to memory
(b) data that has been transferred from memory
(c) the address of a memory location
(d) an instruction that has been transferred from memory
19. When an interrupt occurs, the processor completes the
current ___________ before jumping to the interrupt service
subroutine
(a) microinstruction it is executing
(b) instruction it is executing
(c) macro it is executing
(d) subroutine it is executing
20. A microprocessor is a processor with a reduced
(a) instruction set
(b) power requirement
(c) MIPS performance
(d) none of the above
21. A scheme in which the address specifies which memory
word contains the address of the operand, is called
(a) Immediate addressing
(b) Based addressing
(c) Direct addressing
(d) Indirect addressing
22. Processor gets the address of the next instruction to
be processed from
(a) Instruction register
(b) Instruction counter
(c) Program counter
(d) Program register
23. Fetch operations are not required in
(a) Immediate addressing
(b) Register addressing
(c) Direct addressing
(d) Indirect addressing
24. What is meant by Maskable interrupts?
(a) An interrupt that can be turned off by the programmer.
(b) An interrupt that cannot be turned off by the
programmer.
(c) An interrupt that can be turned off by the system.
(d) An interrupt that cannot be turned off by the system.
25. Which interrupts are generally used for critical events
such as Power failure, Emergency, Shut off etc.?
(a) Maskable interrupts
(b) Non-Maskable interrupts
(c) none of the above
26. Which microprocessor accepts the program written for
8086 without any changes?
(a) 8085
(b) 8087
(c) 8088
27. How many memory locations are required to store the
instruction LXI H, 0800H in an 8085 assembly language
program?
(a) 1
(b) 2
(c) 3
(d) 4
28. How many memory fetches (including instruction fetch)
are required to execute the instruction LXI H, 0800H in an
8085 assembly language program?
(a) 1
(b) 2
(c) 3
(d) 4
29. MPU stands for
(a) Multi-Processing Unit
(b) Micro-Processing Unit
(c) Mega-Processing Unit
(d) Major-Processing Unit
30. Which of the following is not possible by a
microprocessor?
(a) Reading from Memory
(b) Writing into Memory
(c) Reading from Input port
(d) Writing into Input port
31. In which microprocessor does the concept of pipeline
first introduced?
(a) 8086
(b) 80286
(c) 80386
(d) 80486
32. LSI stands for -
(a) Large Size Instruction
(b) Large Scale Instruction
(c) Large Size Integration
(d) Large Scale Integration
33. Which of the following is true about pseudo code?
(a) A machine language
(b) An assembly language
(c) A high level language
(d) none of the above
34. The macro processor must perform
(a) recognize macro definitions and macro calls
(b) save the macro definitions
(c) expand macro calls and substitutes arguments
(d) all of the above
35. A 32 bit microprocessor has the word length equal to
(a) 1 byte
(b) 2 byte
(c) 4 byte
(d) 8 byte
36. The TRAP interrupts mechanism of the 8085 microprocessor
(a) execute an instruction supplied by an external device
through the INTA signal
(b) execute an instruction from memory location 20H
(c) executes a NOP
(d) none of the above
37. What are the states of the Auxiliary carry (AC) and
Carry flag (CY) after executing the following 8085 program?
MVI H, 5DH
MVI L, 6BH
MOV A, H
ADD L
(a) AC=0 and CY=0
(b) AC=1 and CY=1
(c) AC=1 and CY=0
(d) AC=0 and CY=1
38. Contents of register A after the execution of the
following 8085 microprocessor program is
MVI A, 55H
MVI C, 25H
ADD C
DAA
(a) 7AH
(b) 80H
(c) 50H
(d) 22H
39. Which of the following is a 16-bit micro processor?
(a) Motorola 6800
(b) Intel 8085
(c) Intel 8086
(d) Zilo 80
40. The Intel Pentium Pro microprocessor uses 36 address
lines to access memory. What is the maximum memory that it
can support, in gigabytes?
(a) 16
(b) 32
(c) 64
(d) 128
41. Out of the following which is not the flag in 8085
microprocessor
(a) Counter flag
(b) Carry flag
(c) Zero flag
(d) Parity flag
42. What is a basic element of Memory?
(a) Transistor
(b) Flip-flop
(c) Gate
(d) none of the above
43. Which group of instructions do not affect the flags?
(a) Arithmetic operations
(b) Logic operations
(c) Data transfer operations
(d) Branch operations
44. DMA stands for
(a) Direct Memory Allocation
(b) Distinct Memory Allocation
(c) Direct Memory Access
(d) Distinct Memory Access
45. In RST interrupts, RST stands for
(a) Repeat Start Test
(b) Restart
(c) Start
46. Which interrupt has the highest priority?
(a) TRAP
(b) RST 6
(c) RST 6.5
(d) INTR
47. In 8085 microprocessor with memory mapped I/O
(a) I/O device have 8-bit addresses.
(b) I/O devices are accessed using IN and OUT instructions.
(c) arithmetic and logic operations can be directly
performed with the I/O data.
(d) there can be a max of 256 input devices and 256 output
devices.
48. A microprocessor -
(a) reads instructions from memory
(b) communicates with I/O devices
(c) controls the timing of information flow
(d) all of the above
49. An instruction consists of
(a) Data and Address
(b) Register and Memory
(c) Opcode and Operand
(d) Input and Output
50. If the 8085 adds 87H and 79 H, which of the following
flags will become 1
(a) Zero flag and Auxiliary Carry flag
(b) Zero flag and Carry flag
(c) Carry flag and Auxiliary Carry flag
(d) none of the above
1-d,2-a,4-d,5-a,7-c,8-a,6-a,9-d,10-d,12-d,13-a,14-a,15-b,16-
c,17-c,18-a,20-d,21-d,49-b,48-d,47-a,46-d,45-b,44-c,43-c,42-
b,41-b,39-b,38-a,35-c,34-b,32-d,31-a,30-b,29-b
| Is This Answer Correct ? | 5 Yes | 1 No |
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