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General Knowledge QUESTION #9022

Question 1241

10 Downing Street is the official residence of which leader?

Queen of England
British Prime Minister✔️
French President
American President

Correct Answer Logic:

10 Downing Street is the UK Prime Minister's residence.

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Math Physics Chemistry Biology QUESTION #11262

Question 1242

The primary site of gas exchange in the human respiratory system is:

Trachea
Bronchi
Bronchioles
Alveoli✔️

Correct Answer Logic:

Alveoli are tiny air sacs in the lungs where gas exchange occurs. They have extremely thin walls (one cell thick) and are surrounded by capillaries, allowing efficient diffusion of O$_2$ into blood and CO$_2$ out of blood.

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Dairy Food Science and Technology QUESTION #5970

Question 1243

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.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3065

Question 1244

Which process involves the 'Sublimation' of water from a frozen product under vacuum?

Spray drying
Lyophilization (Freeze drying)✔️
Tray drying
Vacuum drying

Correct Answer Logic:

Freeze drying (lyophilization) is used for very heat-sensitive biological products.

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Statistics QUESTION #1996

Question 1245

The first three moments about $a = 16$ are $\mu_1' = -0.35$, $\mu_2' = 2.09$, $\mu_3' = -1.93$. The mean of the distribution is:

15.65✔️
16.35
16
15.35

Correct Answer Logic:

The mean $\bar{x} = a + \mu_1' = 16 + (-0.35) = 15.65$. The first raw moment about any arbitrary origin $a$ equals the deviation of the true mean from $a$, so adding $\mu_1'$ to $a$ recovers the mean.

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Maths QUESTION #7984

Question 1246

What is the set of all prime numbers from 60 to 80?

{61}
{61, 41}
{61, 71}
{61, 67, 71}✔️

Correct Answer Logic:

Prime numbers between 60 and 80:

61 ✓ (prime)
67 ✓ (prime)
71 ✓ (prime)
73 ✓ (prime)

The option listing {61, 67, 71} is the closest correct subset. (73 should also be included but is not listed as a distinct option.)

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Boilers Mechanical Engineering QUESTION #2502

Question 1247

The relationship between the shear force $V$ and bending moment $M$ in a beam is:

$V = \frac{d^2M}{dx^2}$
$M = \frac{dV}{dx}$
$V = \frac{dM}{dx}$✔️
$\frac{dV}{dx} = M$

Correct Answer Logic:

From beam equilibrium: $V = dM/dx$. This means the shear force equals the slope of the bending moment diagram. Similarly, $dV/dx = -w$, where $w$ is the distributed load intensity.

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General Knowledge QUESTION #11443

Question 1248

An error or flaw in a software program that prevents it from running correctly is called a:

Boot
Bug✔️
Biff
Strap

Correct Answer Logic:

A bug is an error, flaw, or fault in a computer program producing incorrect or unexpected results. The term was popularised after Grace Hopper's team found an actual moth causing a malfunction in the Harvard Mark II computer in 1947. Debugging is the systematic process of finding and fixing bugs.

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Mathematics QUESTION #4132

Question 1249

For subspaces $W_1, W_2$ of $\mathbb{R}^3$ with $\dim(W_1) = 2$ and $\dim(W_2) = 2$, what is the minimum $\dim(W_1 \cap W_2)$?

$0$
$1$✔️
$2$
$4$

Correct Answer Logic:

By dimension formula: $\dim(W_1 + W_2) = \dim(W_1) + \dim(W_2) - \dim(W_1 \cap W_2)$. Since $\dim(W_1 + W_2) \leq 3$, we have $2 + 2 - \dim(W_1 \cap W_2) \leq 3$, so $\dim(W_1 \cap W_2) \geq 1$.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3397

Question 1250

Which vitamin is 'Fat-Soluble' and essential for blood clotting?

Vitamin B12
Vitamin C
Vitamin K✔️
Vitamin A

Correct Answer Logic:

Vitamins A, D, E, and K are fat-soluble; B and C are water-soluble.

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Math Physics Chemistry Biology QUESTION #4217

Question 1251

Which of the following hormone is not produced in older women?

Estrogen✔️
Gastrin
Secretin
Renin

Correct Answer Logic:

Estrogen production decreases after menopause.

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Chemistry QUESTION #1448

Question 1252

The resonance energy of benzene is approximately:

150 kJ/mol✔️
200 kJ/mol
250 kJ/mol
None of these

Correct Answer Logic:

The resonance (delocalisation) energy of benzene is approximately 150 kJ/mol (about 36 kcal/mol). This is experimentally determined by comparing the actual heat of hydrogenation of benzene (~208 kJ/mol) with the theoretical value calculated for a hypothetical cyclohexatriene (~360 kJ/mol). The difference (~150 kJ/mol) represents the extra stability due to aromatic delocalisation.

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Chemistry QUESTION #4361

Question 1253

Which one of the following has higher vapour pressure?

Acetone
Acetaldehyde
Isopentane✔️
Benzene

Correct Answer Logic:

Vapour pressure depends on intermolecular forces — weaker forces mean higher vapour pressure. Isopentane ($C_5H_{12}$) has only weak London dispersion forces (low boiling point: $28°C$), giving it the highest vapour pressure among the options.

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Agronomy QUESTION #2053

Question 1254

The 'source–sink' relationship in crop physiology as applied to agronomic management refers to:

The relationship between irrigation source and water sink capacity of soil
The balance between photosynthetic capacity (source: leaves producing assimilates) and the capacity of storage organs (sink: grain, tuber) to accumulate dry matter, which determines yield potential✔️
The nutrient flow between organic matter source (manure) and plant nutrient sink (roots)
The relationship between rainfall source and soil water deficit (sink)

Correct Answer Logic:

In crop physiology, source = photosynthetic organs producing assimilates; sink = organs storing assimilates (grain, tubers). Yield is co-limited by both: a large source with small sink (poor grain set) wastes photosynthate; a large sink with small source (poor canopy) starves grain fill. Agronomic practices (planting density, nutrition, irrigation) manage both.

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Pakistan Affairs QUESTION #9096

Question 1255

From which country did Pakistan purchase the Gwadar port?

Kuwait
Iran
Oman✔️
None of these

Correct Answer Logic:

Pakistan purchased Gwadar from Oman in 1958.

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Boilers Mechanical Engineering QUESTION #2537

Question 1256

For a system in static equilibrium in 3D, the necessary and sufficient conditions are:

Three force equations $\sum F=0$ only
One force and one moment equation
All six scalar equations: $\sum F_x=\sum F_y=\sum F_z=0$ and $\sum M_x=\sum M_y=\sum M_z=0$✔️
Two force equations and one moment equation

Correct Answer Logic:

For complete 3D static equilibrium, both translational ($\sum\mathbf{F}=0$) and rotational ($\sum\mathbf{M}=0$) equilibrium must be satisfied about every axis, yielding six independent scalar equations.

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Geology QUESTION #10663

Question 1257

The quantity of calcium (Ca) in a carbonate rock sample is most accurately determined using which analytical technique?

Gravimetric analysis
Volumetric (titrimetric) analysis✔️
Flame photometry
None of these

Correct Answer Logic:

Volumetric (titrimetric) analysis — specifically EDTA complexometric titration — is the standard and most widely used method for determining Ca²⁺ content in carbonate rocks. Ca²⁺ is titrated with EDTA (ethylenediaminetetraacetic acid) using Eriochrome Black T or Murexide indicator at appropriate pH. Flame photometry (AAS) is also used but requires dissolution and instrumentation. Gravimetric methods are less efficient for routine Ca determination.

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Verbal Reasoning QUESTION #8104

Question 1258

For all real numbers $a$, let $a^* = 1 - a$.

Compare:

Column A: $((-1)^*)^*$

Column B: $2^*$

Column A is greater
Column B is greater
The two quantities are equal✔️
The relationship cannot be determined from the information given

Correct Answer Logic:

Using the definition $a^* = 1 - a$:

Step 1: $(-1)^* = 1 - (-1) = 2$

Step 2: $((-1)^*)^* = (2)^* = 1 - 2 = -1$

Column A $= -1$

Column B: $2^* = 1 - 2 = -1$

Both quantities equal $-1$, so the two quantities are equal.

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Islamic Studies QUESTION #7936

Question 1259

The book of Hadith 'Mavata' was written by:

Imam Malik✔️
Imam Bukhari
Imam Muslim
Imam Tirmidhi

Correct Answer Logic:

Muwatta (not 'Mavata') was compiled by Imam Malik ibn Anas, one of the four great Imams of Islamic jurisprudence. It is one of the earliest collections of Hadith and Islamic jurisprudence, compiled in the 8th century CE. The word 'Muwatta' means 'the well-trodden path' and contains 1,720 hadiths dealing with Islamic law and practice.

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MBBS QUESTION #10234

Question 1260

An isometric muscle contraction is best defined as one in which:

Muscle tension increases while overall muscle length remains essentially unchanged✔️
Muscle length shortens while tension remains constant throughout
Both tension and length change proportionally and simultaneously
Neither cross-bridge cycling nor ATP hydrolysis occurs

Correct Answer Logic:

In an isometric contraction, the muscle generates tension against a fixed load it cannot move (e.g., pushing against an immovable wall), so length stays constant while tension rises — in contrast to an isotonic contraction, where tension remains constant as the muscle shortens (or lengthens) against a constant load.

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