RAM & memory questions and answers
RAM, capacity, channels, usage, virtual memory and memory compatibility.
These are practice variations, many generated from templates and numeric inputs, not an official question bank. They remain outside search indexing until at least 100 independently reviewed questions across five chapters are available.
Questions and clear answers
01Compatibility · foundation · Editorial previewCan DDR4 RAM be used in a DDR5-only slot?+
No. DDR4 and DDR5 have different electrical and physical specifications and are not interchangeable.
02Channels · foundation · Editorial previewWhat is dual-channel memory?+
A compatible system uses two memory channels together to increase available memory bandwidth.
03Performance · foundation · Editorial previewWhen does extra RAM help?+
Extra RAM can reduce swapping and slowdowns when many programs or large datasets exceed available memory.
04Types · foundation · Editorial previewWhat does DDR stand for?+
Double Data Rate, a memory technology that transfers data on both edges of its clock signal.
05Capacity · advanced · Editorial previewIn ram memory — Capacity: A device has 1148 MB free memory. Two tasks use 15 MB and 15 MB. How much free memory remains?+
Remaining free memory = 1148 − 15 − 15 = 1118 MB, assuming no other changes.
06DDR generations · foundation · Editorial previewIn ram memory — DDR generations: A laptop named Model-1947 uses DDR4-only memory slots. Can a DDR5 module be inserted as a compatible replacement?+
No. DDR4 and DDR5 have different physical and electrical specifications; inspect the exact device's supported memory before upgrading.
07Dual channel · foundation · Editorial previewIn ram memory — Dual channel: Each compatible memory channel delivers 2746 units of ideal bandwidth. What is two channels' aggregate theoretical bandwidth?+
Under the ideal doubling model, 2 × 2746 = 5492 units.
08Application memory · intermediate · Editorial previewIn ram memory — Application memory: A device has 3545 MB free memory. Two tasks use 13 MB and 2 MB. How much free memory remains?+
Remaining free memory = 3545 − 13 − 2 = 3530 MB, assuming no other changes.
09Virtual memory · foundation · Editorial previewIn ram memory — Virtual memory: A task requests 4344 MB, with 20 MB available RAM. How much additional capacity is needed?+
Shortfall = 4344 − 20 = 4324 MB; paging behavior depends on the OS.
10Memory bandwidth · advanced · Editorial previewIn ram memory — Memory bandwidth: A memory bandwidth transfer sends 1152 megabits at a steady 4 megabits/second. Find ideal transfer time.+
Time = size/rate = 1152/4 ≈ 288 seconds, ignoring protocol overhead.
11Compatibility · intermediate · Editorial previewIn ram memory — Compatibility: A laptop named Model-943 uses DDR4-only memory slots. Can a DDR5 module be inserted as a compatible replacement?+
No. DDR4 and DDR5 have different physical and electrical specifications; inspect the exact device's supported memory before upgrading.
12Capacity planning · foundation · Editorial previewIn ram memory — Capacity planning: A memory system has 1742 MB and an application needs 18 MB. How many MB remain available under this simple allocation model?+
Remaining = 1742 − 18 = 1724 MB.
13File cache · foundation · Editorial previewIn ram memory — File cache: A device has 2541 MB free memory. Two tasks use 2 MB and 3 MB. How much free memory remains?+
Remaining free memory = 2541 − 2 − 3 = 2536 MB, assuming no other changes.
14Computer performance · intermediate · Editorial previewIn ram memory — Computer performance: A workload performs 3340 independent tasks, each taking 9 seconds sequentially. How many seconds in total?+
Sequential time = 3340 × 9 = 30060 seconds (parallelism not assumed).
15Task switching · advanced · Editorial previewIn ram memory — Task switching: An OS model has 4139 active processes and starts 16 new processes. How many are active if none exits?+
Active processes = 4139 + 16 = 4155.
16Memory troubleshooting · foundation · Editorial previewIn ram memory — Memory troubleshooting: A computer shows error code ERR-4938. What information should be recorded before troubleshooting?+
Capture the exact code ERR-4938, the operation being performed, timing, device and recent changes. Do not diagnose solely from an invented code.
17Capacity · intermediate · Editorial previewIn ram memory — Capacity: A device has 738 MB free memory. Two tasks use 7 MB and 14 MB. How much free memory remains?+
Remaining free memory = 738 − 7 − 14 = 717 MB, assuming no other changes.
18DDR generations · foundation · Editorial previewIn ram memory — DDR generations: A laptop named Model-1537 uses DDR4-only memory slots. Can a DDR5 module be inserted as a compatible replacement?+
No. DDR4 and DDR5 have different physical and electrical specifications; inspect the exact device's supported memory before upgrading.
This is an educational practice preview. Answers and board-specific alignment are undergoing editorial review; these are not official exam questions.