Maharashtra Class XII Computer Science II Sample Questions
1. The register which stores the result of arithmetic and logic operations is called as ………… i. Program counter ii. Accumulator iii. Stack pointer iv. D. Temporary register
2. Program counter in 8085 Microprocessor ………. i. Counts number of programs ii. Counts number of times a subroutine is called iii. Counts the number of times loop are executed iv. Points to the address of the next instruction to be executed
3. In Intel 8085 Microprocessor, ALE signal made high to……. i. Enable AD0-AD7 bus to be used as lower order a. address bus ii. Enable AD0-AD7 bus to be used as data bus (D0-D7) iii. To halt the processor iv. D. To reset the microprocessor
4. ………. is a non Vectored interrupt in 8085. i. RST 7.5 ii. RST 6.5 iii. INTR iv. TRAP
5. ………….. is a lowest priority interrupt i. RST 5.5 ii. RST 6.5 iii. TRAP iv. INTR
6. ………. is the only non- maskable interrupt i. TRAP ii. RST 5.5 iii. RST 7.5 iv. RST 6.5
7. ………….. is not valid register pair in 8085 microprocessor i. B C pair ii. H L pair iii. Accumulator and flag register iv. D E pair
8 Which of the following statement for INTEL 8085 is correct? i. Program counter specifies the address of the last instruction executed ii. Program counter specifies the number of instructions executed so far iii. Program counter specifies the address of the next instruction to be executed iv. Program counter specifies the address of instruction being executed
9. Which of the following data transfer is not possible in 8085 microprocessor? i. Memory to Accumulator ii. Accumulator to memory iii. Accumulator to I/O device iv. Memory to memory
10. If the status of S0 and S1 pin is low, the microprocessor performs the ………………. i. Reset operation ii. Halt operation iii. Hold operation iv. Interrupt acknowledge
11 In 8085 microprocessor, the stack works on the principle of…… i. First in first out( FIFO) ii. Last in last out( LILO) iii. Last in first out( LIFO) iv. None
12 8085 requires …….Power supply i. +5 V ii. +15 V iii. -5 V iv. +10V
13. The 8085 microprocessor can address …….. bytes of memory i. 1k ii. 4k iii. 128 k iv. 64K
14 In an Intel 8085 microprocessor, why is READY signal is used? i. To indicate that microprocessor is working and is ready for use ii. To provide proper WAIT states when the microprocessor is communicating with a slow peripheral device. iii. To slow down a fast peripheral device so as to communicate at the microprocessor’s device. iv. None of the above.
15 ALU (Arithmetic and Logic Unit ) of 8085 microprocessor consists of……….. i. Accumulator, temporary register, arithmetic and logic circuits ii. Accumulator, arithmetic, logic circuits and five flags iii. Accumulator, arithmetic and logic circuits iv. Accumulator, temporary register, arithmetic, logic circuits and five flags
16 INTEL 8085 microprocessor was introduced in …… i. 1978 ii. 1976 iii. 1996 iv. 2003
17 The clock speed of 8085 microprocessor is ………… i. 2MHz ii. 10MHz iii. 3 MHz iv. 100Mhz
18 There are …………..general purpose registers in 8085 processor i. 3 ii. 7 iii. 10 iv. 6
19 ……..signal is used as the system clock for devices connected with the microprocessor. i. X1,X2 ii. CLK OUT iii. RESET OUT iv. ALE
20 In a flag register of 8085…………….. number of bits are unused i. 8 ii. 5 iii. 3 iv. 6
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