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For independent samples, $\sigma^2_{\bar{X}_1 - \bar{X}_2} = \dfrac{\sigma_1^2}{n_1} + \dfrac{\sigma_2^2}{n_2}$. For population $\{4,6,8\}$: $\mu_1=6$, $\sigma_1^2 = \frac{8}{3}$. For $\{1,2,3\}$: $\mu_2=2$, $\sigma_2^2=\frac{2}{3}$. So variance $= \frac{8/3}{2}+\frac{2/3}{2} = \frac{4}{3}+\frac{1}{3}=\frac{5}{3}$.

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Biology QUESTION #520

Question 3930

In what stage of aerobic respiration are 2-carbon molecules oxidized completely to carbon dioxide?

Glycolysis
ETC
Krebs cycle✔️
Calvin cycle

Correct Answer Logic:

Krebs cycle oxidizes acetyl-CoA to CO₂

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Islamic Studies QUESTION #635

Question 3931

Sheikh Ali Hajwiri (Data Ganj Bakhsh) came to Lahore during whose period?

Mahmood Ghaznavi
Masood Ghaznavi✔️
Shahabuddin Ghori
None of these

Correct Answer Logic:

He arrived in Lahore during the reign of Masood Ghaznavi, son of Mahmood.

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Civil Procedure QUESTION #5665

Question 3932

A party wishes to depose an expert witness who has been retained by the opposing side for trial preparation but is not expected to be called as a witness at trial. Under Rule 26(b)(4)(D), when is this allowed?

Always, as long as the party pays the expert's reasonable fee.
Only upon a showing of 'substantial need' and 'undue hardship'.
Only as provided in Rule 35(b) or on showing 'exceptional circumstances' where it is impracticable to obtain facts or opinions by other means.✔️
Never; non-testifying experts are completely protected from discovery.

Correct Answer Logic:

Rule 26(b)(4)(D) provides that a party may not discover facts known or opinions held by a non-testifying expert except as provided in Rule 35(b) or on showing exceptional circumstances.

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Computer Science QUESTION #1137

Question 3933

The process of mapping logical addresses to physical addresses is handled by:

Operating System
Memory Management Unit (MMU)✔️
Compiler
Linker

Correct Answer Logic:

The MMU is a hardware component that translates virtual (logical) addresses generated by the CPU into physical addresses in RAM.

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Biology QUESTION #582

Question 3934

Name the human tissues that contain about 85% water

Nerve cells
Bone cells
Brain cells✔️
None of these

Correct Answer Logic:

Brain tissue has high water content (~85%)

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Dairy Food Science and Technology QUESTION #5970

Question 3935

The term 'fat depression' in dairy cows refers to:

A decrease in milk yield during hot weather
A condition where milk fat percentage falls below normal (typically $<2.5\%$) often due to high-grain low-roughage diets and altered rumen fermentation (low acetate:propionate ratio)✔️
A genetic mutation affecting fat synthesis
A consequence of mastitis on fat content

Correct Answer Logic:

Milk fat depression (MFD) occurs when rumen fermentation is altered by high-grain/low-fiber diets: less acetate (main fat precursor in mammary gland) and more propionate is produced. Trans-10, cis-12 CLA is a potent inhibitor of mammary de novo fat synthesis. MFD also affects butter yield.

Uploaded by: Fani Warraich