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The cell walls of algae are composed of cellulose, galactans, and mannans (polysaccharides). Some algae also have additional components: diatoms have silica; red algae have agar and carrageenan (both galactans). This distinguishes algal walls from plant walls (cellulose + hemicellulose + pectin) and fungal walls (chitin).

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English Literature QUESTION #678

Question 10585

Who is the antagonist in "1984"?

Winston Smith
Julia
Big Brother✔️
Syme

Correct Answer Logic:

Big Brother is the symbolic leader of the Party, representing the ultimate antagonist.

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Aptitude QUESTION #10942

Question 10586

A cone of radius 6 cm and height 8 cm is placed inside a cylinder of the same base radius and height. What fraction of the cylinder's volume is NOT occupied by the cone?

\(\dfrac{1}{3}\
\(\dfrac{2}{3}\✔️
\(\dfrac{3}{4}\
\(\dfrac{1}{4}\

Correct Answer Logic:

Volume of cylinder = \(\pi r^2 h = \pi \times 36 \times 8 = 288\pi\

Volume of cone = \(\dfrac{1}{3}\pi r^2 h = \dfrac{1}{3} \times 288\pi = 96\pi\

Volume NOT occupied = \(288\pi - 96\pi = 192\pi\

Fraction = \(\dfrac{192\pi}{288\pi} = \dfrac{2}{3}\

This confirms the classic result: a cone always occupies exactly \(\dfrac{1}{3}\ of the enclosing cylinder, so the remaining fraction is \(\dfrac{2}{3}\.

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English Literature QUESTION #10731

Question 10587

In Ibsen's A Doll's House, Mrs. Linde serves as a foil and model to __________, who recognises through her that a woman is entitled to her own judgment and independent thought.

Gina
Rebecca
Nora✔️
Hedda

Correct Answer Logic:

In Ibsen's A Doll's House, Nora Helmer is the central protagonist. Mrs. Linde (Kristine) serves as her foil — a contrast and model. While Nora has lived a sheltered, dependent life, Kristine Linde has experienced financial hardship, independence, and self-reliance. Through her friendship with Kristine, Nora comes to recognise her own capacity for independent thought and ultimately leaves her husband.

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Chemistry QUESTION #7114

Question 10588

When titrating a weak base against a strong acid, which indicator and end-point color change is the most appropriate?

Methyl orange; Yellow to pinkish red✔️
Phenolphthalein; Pink to colourless
Methyl orange; Colourless to pink
Phenolphthalein; Pinkish red to yellow

Correct Answer Logic:

For a titration between a weak base and a strong acid, the equivalence point lies in the acidic range ($pH < 7$). Methyl orange is a suitable indicator as its color change interval ($3.1$ to $4.4$) matches this range, changing from yellow in basic/neutral conditions to pinkish-red in acidic conditions.

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Physics QUESTION #7833

Question 10589

I-V graph for a non-ohmic material is always:

Curved✔️
Horizontal
Linear
Perpendicular

Correct Answer Logic:

Non-ohmic: resistance not constant, so I-V curve is nonlinear (curved).

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Chemistry QUESTION #7393

Question 10590

The correct order of electron gain enthalpy (with negative sign) for the atomic species F, Cl, O and S is:

$\text{F} < \text{Cl} < \text{O} < \text{S}$
$\text{S} < \text{O} < \text{Cl} < \text{F}$
$\text{O} < \text{S} < \text{F} < \text{Cl}$✔️
$\text{Cl} < \text{F} < \text{S} < \text{O}$

Correct Answer Logic:

Electron gain enthalpy trend:
O has lower EA than S (too small, high e⁻ repulsion). F has lower EA than Cl (same reason). Cl has the highest EA among these.

Correct order (increasing magnitude of negative EGE):
$\text{O} < \text{S} < \text{F} < \text{Cl}$

i.e., Cl releases most energy on gaining an electron.

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Education QUESTION #11684

Question 10591

The nationalization of private educational institutions in Pakistan took place under which policy?

Education Conference 1947
National Education Commission 1959
National Education Policy 1972✔️
None of these

Correct Answer Logic:

The National Education Policy 1972, implemented under Prime Minister Zulfikar Ali Bhutto, is known for the mass nationalization of private educational institutions. This was a major and controversial policy that brought thousands of private schools and colleges under government control.

Correct Answer: C — National Education Policy 1972.

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Pakistan Affairs QUESTION #4677

Question 10592

The AFPAK policy was announced by the Obama administration in which year?

2008
2009✔️
2007
2010

Correct Answer Logic:

The AFPAK (Afghanistan-Pakistan) policy was announced by President Barack Obama in March 2009. It combined the US strategies for Afghanistan and Pakistan into a single regional policy framework.

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The Elections Act 2017 QUESTION #9463

Question 10593

Section 160(2) provides that after disposal of an election petition, the Election Tribunal must forward the record to the Commission. The Commission retains this record for:

Three years or until disposal of any appeal
Two years from date of receipt
Five years from the date of its receipt or till disposal of appeal against the Tribunal's decision✔️
One year from the date of its receipt

Correct Answer Logic:

Section 160(2) states: 'The Commission shall retain it for a period of five years from the date of its receipt or till the disposal of appeal against the decision of the Tribunal, if any, and shall thereafter cause it to be destroyed.'

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