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DBMS · Storage: disks, RAID & buffers

13 questions · 33 marks · 6 papers

Answer key

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Database Management Systems

Storage: disks, RAID & buffers

Official Paper

Examination Instructions & Guidelines

Solve on notebook/paper first before checking solutions.
MCQ: Exactly 1 option is correct. Negative marking applies.
MSQ: One or more options correct. Select all to score.
NAT: Numerical response. No negative marking.
Scientific calculator allowed for all calculations.
Official answer key is sealed at the end of this sheet.

End Term · 31 Aug 2025 (FN)End Term

Q1NAT3 Marks·Write the number
Key ↓
Consider a magnetic disk with 16 platters, 2 surfaces per platter, 1024 tracks per surface, 2048 sectors per track and 512 bytes per sector. The disk rotates at 6000 rpm. What is the disk capacity (in GB)?
Your answer:

Quiz 2 · 3 Aug 2025 (AN)Quiz 2

Q2MCQ4 Marks·Choose one option
Asked 3 times Key ↓
1. A8
2. B9
3. C10
4. D11
Q3MSQ2 Marks·Choose all correct options
Key ↓
Identify the correct statement(s):
1. ABinary search has a time complexity of O(log n). where n is number of elements.
2. BIn a linked list the data elements are required to be stored in contiguous memory locations
3. CMain memory is the fastest and most costly form of storage
4. DA sector is the smallest unit of data read or written on a Magnetic Disk for every read operation.
Q4MSQ3 Marks·Choose all correct options
Key ↓
1. AQuery 1 will execute more efficiently when multitable clustering file organization scheme is used.
2. BBoth the queries will execute more efficiently when sequential clustering file organization scheme is used.
3. CQuery 2 will execute more efficiently when sequential clustering file organization scheme is used.
4. DQuery 1 will execute more efficiently when sequential clustering file organization scheme is used.

End Term · 13 Apr 2025 (FN)End Term

Q5NAT3 Marks·Write the number
Asked 2 times Key ↓
Consider you have a file in your hard disk of size 1000 KB. Seek time of your hard disk read head is 3ms and rotational speed in 30,000 rpm. The disk has 200 sectors per track and 512 bytes per sector. Considering the fact that the file data is stored in non consecutive sectors. How much time will be required to read the whole file after a read request is made? (in ms)
Your answer:
Q6NAT3 Marks·Write the number
Asked 3 times Key ↓
Consider a system using the Least Recently Used (LRU) page replacement policy. The system has a main memory buffer with 4 slots, and the page reference sequence is as follows: 3, 4, 1, 4, 2, 3, 1, 4, 2, 3 Calculate the total number of page misses (page faults) during this sequence.
Your answer:

End Term · 13 Apr 2025 (AN)End Term

Q7MCQ1 Mark·Choose one option
Key ↓
Consider the following statements and select the correct option. 1. RAID 1 employs mirroring, maintaining two identical copies of the data on two different disks 2. RAID 3 has a single check disk with parity information.
1. ABoth the statements are correct.
2. BBoth the statements are wrong.
3. CStatement 1 is correct and statement 2 is wrong.
4. DStatement 1 is wrong and statement 2 is correct.
Q8NAT3 Marks·Write the number
Asked 2 times Key ↓
Consider you have a file in your hard disk of size 1024 KB. The seek time of your hard disk read head is 4 ms, and the rotational speed is 30,000 rpm. The disk has 256 sectors per track, and each sector stores 512 bytes. Considering that the file data is stored in non-consecutive sectors, how much time will be required to read the whole file after a read request is made (in ms)?
Your answer:
Q9NAT3 Marks·Write the number
Asked 3 times Key ↓
Your answer:

End Term · 22 Dec 2024 (FN)End Term

Q10MCQ2 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q11MCQ2 Marks·Choose one option
Asked 2 times Key ↓
Consider seek time of your hard disk read head is 2ms, rotational speed is 60,000 RPM. The disk has 300 sectors/track and sector size is 256 bytes. What will be the transfer rate (KB/ms)?
1. A75 KB/ms
2. B25 KB/ms
3. C50 KB/ms
4. D100 KB/ms

End Term · 22 Dec 2024 (AN)End Term

Q12MCQ2 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q13MCQ2 Marks·Choose one option
Asked 2 times Key ↓
Consider seek time of your hard disk read head is 2ms, rotational speed is 30,000 RPM. The disk has 400 sectors/track and sector size is 128 bytes. What will be the transfer rate (KB/ms)?
1. A75 KB/ms
2. B25 KB/ms
3. C50 KB/ms
4. D100 KB/ms

Official Key

Master Answer Key & Explanations

Official answer keys from IIT Madras BS past papers. Click any question to review.

Reveal Key

Q132

Q2C

Q3A, D

Q4A, C

Q524

Q64

Q7A

Q821

Q94

Q10A

Q11A

Q12A

Q13B

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