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1. A low memory can be connected to microprocessor by using




C : Both (a) and (b)


2. To put the microprocessor in the wait state


A : lower the HOLD input

B : lower the READY input

C : raise the HOLD input

D : None of these

3. A basic instruction that can be interpreted by a computer generally has


A : An operand and an address

B : A decoder and an accumulator

C : Sequence register and decoder

D : None of these

4. In a microprocessor system with memory mapped I/O


A : Devices have 8-bit addresses

B : Devices are accessed using IN and OUT instructions

C : There can be a maximum of 256 input devices and 256 output devices

D : Arithmetic and logic operations can be directly performed with the I/O data.

5. The addressing mode used in an instruction of the form ADD X, Y, is


A : absolute

B : immediate

C : indirect

D : Relative

6. The ability to temporarily halt the CPU and use this time to send information on buses is called


A : Direct memory access

B : Vectoring the interrupt

C : System Interrupt

D : Cycle stealing

7. Number of machine cycles required for RET instruction in 8085 microprocessor is


A : 1

B : 2

C : 3

D : None of these

8. In a microprocessor system, the RST instruction will cause an interrupt


A : only if an interrupt service routine is being executed

B : only if a bit in the interrupt mask is made 0

C : only if interrupts have been enabled by an EI instruction

D : none of these

9. An instruction used to set the carry flag in a computer can be classified as


A : Data transfer

B : Process control

C : Logical

D : None of these

10. Microprocessor 8085 is the enhanced version of ......... with essentially the same construction set


A : 6800

B : 68000

C : 8080

D : 8088

11. In a generic microprocessor instruction cycle time is


A : Shorter than machine cycle time

B : Larger than machine cycle time

C : Ten times the machine cycle time

D : Exactly the same as the machine cycle time

12. The stack pointer in the microprocessor is a


A : 16 bit register that point to stack memory locations

B : 32 bit accumulator

C : memory location in the stack

D : flag register used for the stack

13. Micro program is


A : The name of source program in micro computers

B : The set of instructions indicating the primitive operations in a system

C : Primitive form of macros used in assembly language programming

D : Program of very small size

14. If we use 3 bits in the instruction word to indicate if an index register is to be used and if necessary, which one is to be used, then the number of index registers to be used in the machine will be


A : 3

B : 6

C : 5

D : 8

15. In a multiprocessor configuration,two co-processors are connected to the host 8086 processor. The two co-processor instruction sets


A : May be different

B : May overlap

C : Must be disjoint

D : Must be the same as that of the host

16. A certain processor supports only the immediate and the direct addressing modes. Which of the following programming language features cannot be implemented on this processor ?


A : Pointers

B : Arrays

C : Records

D : All of these

17. In the absolute addressing mode


A : Operand is inside the instruction

B : Address of the operand is outside the instruction

C : Register containing the address of the operand is specified inside the instruction

D : Location of the operand is implicit.

18. The programmable interval timer is


A : 8251

B : 8250

C : 8253

D : 8088

19. Pseudo-instructions are


A : Assembler directives

B : Instructions in any program that have corresponding machine code instruction

C : Instruction in any program whose absence will not change the output for any input

D : None of these

20. The number of instructions needed to add 'n' numbers and store the result in memory using only one address instructions is


A : n

B : n+1

C : n-1

D : independent of n

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