Page tables conceptual

Question

which of the following is/are TRUE,
(I) a single page-table entry can store the mappings for multiple physical-page frames.
(II) Clustered page tables are particularly useful for dense address spaces.
(III) Inverted page table includes process-id as one of its attributes.

Comments

I think 1 and 3 are true.

I am not sure about 2. But 1 and 3 are surely true!

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How is 1 correct?

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1 should be FALSE, for general page tables. But it will be true if we store page table as HASHED table.

And 3 is definitely TRUE.

no idea about 2.

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ohh sorry my mistake. 1 is false. i read it other way.

Answer 1

1.  FALSE First is false because it is the case with hashed page table not simple.
2. FALSE clustered  page table that can be viewed as hashed page table, it associates mapping for severals page.it is useful for sparse address space.
3. CORRECT inverted page table include pid as one of its attributes.

Comments

but in these types of questions how we will know that they are talking about which type of page tables ...simple or hashed, coz in one of the test series i had joined they had given 1st one as true