computer organization and architecture

1. The method of accessing the I/O devices by repeat checking the status flags is
Status flags को बार-बार check करके I/O devices को access करने की method क्या कहलाती है?
(BPSC TRE 1.0 2023)
A. Program-controlled I/O
B. Memory-mapped I/O
C. I/O-mapped I/O
D. More than one of the above

Correct Answer: A

Explanation (EN): Program-controlled I/O continuously checks device status causing CPU busy waiting.

Explanation (HI): Program-controlled I/O में CPU लगातार device status check करता है जिससे busy waiting होती है.

2. In memory mapped I/O
Memory mapped I/O में क्या होता है?
(BPSC TRE 1.0 2023)
A. I/O devices and memory share same address space
B. I/O devices have separate address space
C. Memory and I/O have associated address space
D. More than one of the above

Correct Answer: A

Explanation (EN): Memory mapped I/O uses same address space for memory and devices.

Explanation (HI): Memory mapped I/O में memory और I/O same address space share करते हैं.

3. What is the function of data input command in I/O command?
I/O command में data input command का कार्य क्या है?
(DSSSB PGT C.S.)
A. Activate peripheral
B. Check status conditions
C. Transfer data from bus to register
D. Transfer data from register to bus

Correct Answer: C

Explanation (EN): Data input command transfers data from bus to interface register.

Explanation (HI): Data input command bus से register में data transfer करता है.

4. When Bus Grant BG = 1 in DMA transfer then read and write lines perform
जब DMA में BG = 1 हो तो read/write lines क्या करती हैं?
(DSSSB PGT C.S.)
A. Input lines for CPU
B. Read input write output
C. Read output write input
D. Both output lines

Correct Answer: D

Explanation (EN): Read and write lines act as output lines from DMA controller.

Explanation (HI): DMA में read और write lines output lines की तरह काम करती हैं.

5. Which data transfer scheme requires constant CPU monitoring of peripheral devices?
कौन-सी data transfer scheme में CPU को लगातार peripheral monitor करना पड़ता है?
(DSSSB PGT C.S.)
A. Programmed I/O
B. Interrupt driven I/O
C. DMA
D. Both interrupt and DMA

Correct Answer: A

Explanation (EN): Programmed I/O requires continuous polling by CPU.

Explanation (HI): Programmed I/O में CPU लगातार polling करता है.

6. In DMA a block sequence of memory words is transferred in continuous burst
DMA में continuous block transfer को क्या कहते हैं?
(UGC NET)
A. Bus granting
B. Burst transfer
C. Cycle stealing
D. Controller count

Correct Answer: B

Explanation (EN): Burst transfer transfers block of data continuously.

Explanation (HI): Burst transfer में data block continuous transfer होता है.

7. A DMA controller transfers 32-bit words at 4800 characters per second CPU executes 1 million instructions per second what is slowdown?
DMA transfer के कारण CPU slowdown कितना होगा?
(UGC NET 2015)
A. 0.06%
B. 0.12%
C. 12%
D. 25%

Correct Answer: B

Explanation (EN): Slowdown = (1200/1000000)*100 = 0.12%.

Explanation (HI): Slowdown 0.12% होता है.

8. Which of the following is correct statement?
निम्न में से कौन-सा statement सही है?
(UGC NET 2017)
A. Memory mapped uses separate control
B. Isolated I/O separates address space
C. Async uses common clock
D. Sync uses different clocks

Correct Answer: B

Explanation (EN): Isolated I/O keeps memory and I/O address separate.

Explanation (HI): Isolated I/O में memory और I/O अलग address space रखते हैं.

9. Arrange steps of DMA transfer in correct order
DMA transfer के steps सही क्रम में लगाइए?
(UGC NET 2024)
A. C A B D
B. A C B D
C. A B C D
D. C B A D

Correct Answer: B

Explanation (EN): Correct order is request grant transfer complete.

Explanation (HI): सही क्रम है request grant transfer complete.

10. Interfaces that provide I/O transfer directly to and from memory and peripheral are
Memory और peripheral के बीच direct transfer देने वाले interfaces कौन-से हैं?
(UGC NET 2023)
A. DMA only
B. IOP only
C. DMA and IOP
D. Serial and Parallel

Correct Answer: C

Explanation (EN): DMA and IOP both provide direct transfer.

Explanation (HI): DMA और IOP दोनों direct transfer देते हैं.

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