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Medicinal Chemistry and Biopharmaceutics QUESTION #3824

If $400$ mg of potassium permanganate is dissolved in $2.5$ L of water, what is the percentage concentration of the resulting solution?

$0.016\%$✔️
$0.032\%$
$0.064\%$
$0.16\%$

Correct Answer Logic:

$400\ \text{mg} = 0.4\ \text{g}$ in $2500\ \text{mL}$. Concentration $= \dfrac{0.4}{2500} \times 100 = 0.016\%\ \text{w/v}$.

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Mathematics QUESTION #4140

Question 7542

If $\vec{a} \cdot (\vec{b} \times \vec{c}) = 0$, what does this imply?

$\vec{a}$ is perpendicular to $\vec{b}$
$\vec{a}$, $\vec{b}$, $\vec{c}$ are coplanar✔️
$\vec{b}$ is parallel to $\vec{c}$
$\vec{a} = \vec{0}$

Correct Answer Logic:

The scalar triple product $\vec{a} \cdot (\vec{b} \times \vec{c})$ equals the volume of the parallelepiped formed by the three vectors. If zero, the vectors are coplanar (linearly dependent).

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Molecular Biology / Bioinformatics / Biochemistry QUESTION #11054

Question 7543

Which of the following coronaviruses has caused thousands of deaths globally and is classified as an 'emergent' virus?

MERS
SARS✔️
OC43
HKU1

Correct Answer Logic:

SARS (Severe Acute Respiratory Syndrome) coronavirus caused a global outbreak in 2002–2003, resulting in over 8,000 cases and nearly 800 deaths across 37 countries. It is classified as an 'emergent' virus — one that has newly appeared in a population or rapidly expanded in host range, geographic distribution, or severity. MERS (Middle East Respiratory Syndrome) is also emergent but caused fewer deaths. SARS-CoV-2 (COVID-19) is the most recent example.

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English Literature QUESTION #696

Question 7544

In "Hamlet," who says "To be, or not to be"?

Claudius
Polonius
Hamlet✔️
None of these

Correct Answer Logic:

This is the opening line of Hamlet's most famous soliloquy on the nature of existence and death.

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English QUESTION #819

Question 7545

Spot the error: 'He (A)borrowed the money (B)so he could (C)finish his (D)education.'

borrowed
so he could✔️
finish his
education

Correct Answer Logic:

The error is at (B). 'so he could' should be 'so that he could'. The conjunction 'so that' is correct for expressing purpose.

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General Science and Ability QUESTION #249

Question 7546

If the radius of a circle is increased three times then its area is increased:

Three times
Six times
Nine times✔️
None of these

Correct Answer Logic:

Area A=πr2. If r becomes 3r, then A becomes π(3r)2=9πr2.

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Boilers Mechanical Engineering QUESTION #4072

Question 7547

'Purging' the furnace before ignition is done to:

Clean the dust
Remove any unburnt fuel/gases to prevent an explosion (mishap)✔️
Heat the furnace
Cool the burner

Correct Answer Logic:

A high-volume air purge is the first step in any safe burner start-up sequence.

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Statistics QUESTION #2001

Question 7548

A company has 800 employees; 20% hold college degrees, half of whom are in non-management. Of the non-degree employees, 30% are in management. The total number of managers is:

272✔️
260
304
240

Correct Answer Logic:

Degree holders: $0.20 \times 800 = 160$; of these, managers $= 80$. Non-degree: $640$; managers among them $= 0.30 \times 640 = 192$. Total managers $= 80 + 192 = 272$.

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English Literature QUESTION #716

Question 7549

Hester Prynne's daughter in "The Scarlet Letter" is named:

Ruth
Pearl✔️
Mary
Sarah

Correct Answer Logic:

Pearl is the living embodiment of the scarlet letter, a constant reminder of Hester's sin and her spirit.

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Quantitative Reasoning QUESTION #8134

Question 7550

Some researchers argue that carbon compounds are so central to life on Earth due to the possibility of _______ arising from the carbon atom's capacity to form an endless variety of different molecules.

diversity✔️
deviation
reproduction
stability

Correct Answer Logic:

The sentence says carbon can form an unending series of different molecules — this chemical versatility leads to diversity of life forms. Carbon's ability to create countless molecule types is precisely what generates biological variety. 'Variety' is the synonym pair in the original exam. 'Deviation' implies abnormality. 'Reproduction' refers to biological copying. 'Stability' is the opposite of variety.

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Mathematics QUESTION #7467

Question 7551

If sum of all the solutions of the equation $8\cos x \cdot (\cos(\frac{\pi}{6}+x) \cdot \cos(\frac{\pi}{6}-x) - \frac{1}{2}) = 1$ in [0, π] is kπ, then k is equal to:

$\frac{8}{9}$
$\frac{20}{9}$
$\frac{2}{3}$
$\frac{13}{9}$✔️

Correct Answer Logic:

Simplifying the product: $\cos(\frac{\pi}{6}+x)\cos(\frac{\pi}{6}-x) = \frac{1}{2}[\cos(\frac{\pi}{3}) + \cos(2x)] = \frac{1}{2}[\frac{1}{2} + \cos 2x] = \frac{1}{4} + \frac{\cos 2x}{2}$. The equation becomes: $8\cos x(\frac{1}{4} + \frac{\cos 2x}{2} - \frac{1}{2}) = 1$, which gives $8\cos x(\frac{\cos 2x}{2} - \frac{1}{4}) = 1$, or $4\cos x(\cos 2x - \frac{1}{2}) = 1$. Since $\cos 2x = 2\cos^2 x - 1$: $4\cos x(2\cos^2 x - 1 - \frac{1}{2}) = 1$, giving $4\cos x(2\cos^2 x - \frac{3}{2}) = 1$, or $8\cos^3 x - 6\cos x - 1 = 0$. Solving this cubic and finding solutions in [0,π], then summing them gives $k = \frac{2}{3}$.

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Geology QUESTION #10683

Question 7552

A horizontal mine excavation developed along the strike of a tabular ore body is called a:

Crosscut
Raise
Drive (drift)✔️
Shaft

Correct Answer Logic:

A drive (or drift) is a horizontal mine excavation developed along the strike of an ore body, following the mineralisation. In contrast:

Crosscut: horizontal excavation driven across the strike of the ore body (from a shaft or level)
Raise: vertical or steeply inclined excavation driven upward from a lower level
Shaft: vertical or inclined excavation providing primary access to the mine from surface

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Maths QUESTION #2885

Question 7553

Solve for $x$: $4x - 7 = 2x + 5$

3
6✔️
4
12

Correct Answer Logic:

$4x - 2x = 5 + 7 \implies 2x = 12 \implies x = 6$.

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Biology QUESTION #7281

Question 7554

In which of the following are male and female gametophytes independent and free-living?

Sphagnum✔️
Mustard
Castor
Pinus

Correct Answer Logic:

In Sphagnum (a moss), the gametophyte is the dominant, free-living, independent phase of the life cycle. Both male and female gametes are produced on the free-living gametophyte. In seed plants like mustard, castor, and Pinus, the gametophytes (pollen grain and embryo sac) are microscopic and completely dependent on the sporophyte.

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Planning QUESTION #4995

Question 7555

Which Act is considered foundational for modern UK planning legislation?

Town and Country Planning Act 1947✔️
Housing Act 1930
Public Health Act 1875
Building Act 1909

Correct Answer Logic:

The Town and Country Planning Act 1947 revolutionized UK planning by nationalizing development rights, introducing development control requiring planning permission, creating comprehensive development plans, and establishing the framework for modern statutory planning systems.

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Security Measures to Maintain Law and Order QUESTION #849

Question 7556

The rank of "Assistant Director" in ASF is equivalent to which military rank for administrative purposes?

Captain
Major✔️
Lieutenant
Colonel

Correct Answer Logic:

Per Section 3, an Assistant Director is equivalent to a Captain (while Deputy Director is Major).

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Agronomy QUESTION #2051

Question 7557

Conservation agriculture (CA) is based on three core principles. Which combination correctly identifies all three?

Deep plowing + high input use + crop rotation
Minimum soil disturbance (no/minimum tillage) + permanent soil cover (mulch/crop residues) + crop species diversification (rotation/intercropping)✔️
Organic farming + biological pest control + rainwater harvesting
Precision irrigation + slow-release fertilizers + integrated pest management

Correct Answer Logic:

FAO defines Conservation Agriculture by three linked principles: (1) minimum mechanical soil disturbance, (2) permanent organic soil cover with crop residues or cover crops, and (3) species diversification through crop rotations and/or intercropping. All three must be practiced simultaneously for CA to deliver its full benefits.

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Nursing QUESTION #9299

Question 7558

A patient has a wound with a sinus tract 8 cm deep. The appropriate method for wound packing is:

Pack tightly to obliterate all dead space
Loosely fill the sinus tract with moistened gauze without overpacking✔️
Leave the wound open without any packing
Apply dry gauze dressing only to the surface

Correct Answer Logic:

Wound packing with sinus tracts (tunnels) requires:

Loose packing to fill dead space without pressure — tight packing impairs circulation and healing
Use moistened gauze (saline-moistened) — maintains a moist wound environment that promotes healing
Packing prevents premature surface closure while the wound heals from the base upward (primary intention vs. secondary intention healing)

Wound packing principles:

Measure depth and width at each dressing change
Document amount of packing material inserted and removed
Pack gently to avoid trauma
Do not pack so tightly that it creates pressure necrosis
Use sterile technique throughout

Failure to pack sinus tracts properly leads to premature wound closure with abscess formation underneath.

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Maths QUESTION #7971

Question 7559

One side of a rectangle is 22 feet. Which of the following could be the perimeter of the rectangle?

28 feet
33 feet
44 feet
54 feet✔️

Correct Answer Logic:

Perimeter $= 2(l + w)$. If one side $= 22$, then perimeter $= 2(22 + w)$. This must be greater than $2 \times 22 = 44$ feet (as $w > 0$) and must be even. From the options, 54 is the only value $> 44$ and achievable: $54 = 2(22+5) \Rightarrow w = 5$ ✓

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English QUESTION #8393

Question 7560

Fill in the blank: 'He did not pay _______ to his brother's advice.'

For
On
To✔️
In

Correct Answer Logic:

'Pay heed to' means pay attention to.

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