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Dairy Food Science and Technology QUESTION #5874

The Methylene Blue Reduction Test (MBRT) estimates milk quality by measuring:

Somatic cell count
Fat content
Bacterial metabolic activity that decolorizes methylene blue✔️
Antibiotic residues

Correct Answer Logic:

MBRT is a reductase test. Bacterial enzymes reduce methylene blue (blue) to leucomethylene blue (colorless). Faster decolorization indicates higher bacterial load and poorer milk quality.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3450

Question 1682

'Vitamin B2' is also known as:

Thiamine
Riboflavin✔️
Niacin
Biotin

Correct Answer Logic:

It is part of the co-enzymes $FAD$ and $FMN$.

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Pakistan Affairs QUESTION #324

Question 1683

Who is Pakistan's first female mountaineer to conquer Mount Everest?

Nazia Parveen
Samina Baig✔️
Mahoor Shahzad
Benazir Bhutto

Correct Answer Logic:

Samina Baig became the first Pakistani woman to reach the summit of Mount Everest in 2013.

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Chemistry QUESTION #7367

Question 1684

Based on the energy equation $E = -2.178 \times 10^{-18} \text{ J} \left(\dfrac{Z^2}{n^2}\right)$, which conclusion is INCORRECT?

For $n=1$, the electron has more negative energy than at $n=6$, so it is more loosely bound in the smallest orbit✔️
The negative sign means energy of bound electron is lower than that of a free electron at infinite distance
Larger $n$ means larger orbital radius
This equation can calculate energy change during electron transitions

Correct Answer Logic:

Analysing option (1):
At $n=1$, $E$ is most negative ($-2.178 \times 10^{-18}$ J for H). Most negative = most tightly bound (lowest energy state). Saying it is loosely bound is WRONG — it is the most tightly bound state.

The other statements are all correct interpretations of the Bohr energy equation. The electron at $n=1$ is hardest to remove (highest ionisation energy).

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MCQs Section QUESTION #4846

Question 1685

Pick the word nearly opposite in meaning to "PHLEGMATIC"

Dull
Active✔️
Lymphatic
Frigid

Correct Answer Logic:

Phlegmatic means having a calm, unemotional, and stolidly sluggish temperament. Its antonym is 'active,' implying energetic and lively behavior.

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Mathematics QUESTION #6014

Question 1686

How many values of $k$ allow the system of equations $(k+1)x + 8y = 4k$ and $kx + (k+3)y = 3k-1$ to have no solution?

Infinite
1✔️
2
3

Correct Answer Logic:

For no solution, the determinant of the coefficient matrix must be zero but the system must be inconsistent.

$\Delta = (k+1)(k+3) - 8k = k^2+4k+3-8k = k^2-4k+3 = (k-1)(k-3) = 0$

So $k=1$ or $k=3$. Check each:

$k=1$: Equations become $2x+8y=4$ and $x+4y=2$ — same line (infinite solutions). Not "no solution".

$k=3$: Equations become $4x+8y=12$ and $3x+6y=8$. Simplify: $x+2y=3$ and $x+2y=8/3$ — contradiction! No solution.

So exactly $\mathbf{1}$ value of $k$ gives no solution.

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Tourism & Hospitality Management QUESTION #1643

Question 1687

The Accounting and Finance course covers five categories of financial ratio analysis. Which of the following correctly lists all five ratio categories covered in the curriculum?

Profitability, Liquidity, Efficiency, Leverage, and Growth ratios
Liquidity ratio, Activity ratio, Solvency ratio, Profitability ratio, and Cost Analysis✔️
Revenue ratio, Expense ratio, Profit ratio, Asset ratio, and Equity ratio
Current ratio, Quick ratio, Debt ratio, Return on equity, and Earnings per share

Correct Answer Logic:

Module 5 (Financial Analysis) of the Accounting and Finance course explicitly identifies five analytical frameworks: Liquidity Ratio (short-term solvency), Activity Ratio (asset utilization efficiency), Solvency Ratio (long-term debt capacity), Profitability Ratio (return generation), and Cost Analysis — alongside Vertical, Horizontal, and Ratio Analysis methods.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3216

Question 1688

'Ovulation' is triggered by a sudden surge in which hormone?

Estrogen
Progesterone
Luteinizing Hormone (LH)✔️
Follicle Stimulating Hormone (FSH)

Correct Answer Logic:

The LH surge on day 14 of the cycle causes the release of the egg.

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Economics QUESTION #1712

Question 1689

Pakistan's water crisis is widely recognised as a compound problem with multiple reinforcing drivers. Which comprehensive assessment best captures the causality behind the country's deepening water stress?

Inefficient irrigation systems and poor canal maintenance leading to massive water losses
Rapid population growth and urbanisation expanding water demand beyond sustainable supply
Glacial retreat, erratic precipitation patterns, and rising temperatures from climate change
All of these✔️

Correct Answer Logic:

Pakistan's water scarcity is a multi-causal crisis: (1) Governance and infrastructure failures — the Indus Basin irrigation system loses an estimated 40% of water to seepage and evaporation; (2) Demand pressure — Pakistan's population growth (one of the highest in Asia) and urban expansion continuously expand water demand; (3) Climate change — accelerating glacial melt (short-term flood risk), long-term reduction in glacier-fed river flows, and shifting monsoon patterns all exacerbate supply-side constraints.

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Biology QUESTION #7284

Question 1690

Membrane-bound organelles are absent in:

Plasmodium
Saccharomyces
Streptococcus✔️
Chlamydomonas

Correct Answer Logic:

Streptococcus is a prokaryote (bacterium) and therefore completely lacks membrane-bound organelles such as mitochondria, endoplasmic reticulum, Golgi apparatus, and nucleus. Plasmodium is a eukaryotic parasite; Saccharomyces is a eukaryotic yeast; Chlamydomonas is a eukaryotic green alga — all have membrane-bound organelles.

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Physics QUESTION #6998

Question 1691

What is the minimum energy needed to launch a satellite of mass $m$ from the surface of a planet of mass $M$ and radius $R$ into a circular orbit at altitude $2R$?

$\dfrac{5GmM}{6R}$✔️
$\dfrac{2GmM}{3R}$
$\dfrac{GmM}{2R}$
$\dfrac{GmM}{3R}$

Correct Answer Logic:

The orbit radius is $r = R + 2R = 3R$.

Orbital KE: $KE = \frac{GmM}{2r} = \frac{GmM}{6R}$

Total mechanical energy in orbit: $E_{orbit} = -\frac{GmM}{2r} = -\frac{GmM}{6R}$

Energy on surface: $E_{surface} = -\frac{GmM}{R}$

Minimum energy required:

$\Delta E = E_{orbit} - E_{surface} = -\frac{GmM}{6R} + \frac{GmM}{R} = \frac{GmM}{R}\left(1 - \frac{1}{6}\right) = \frac{5GmM}{6R}$

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Economics QUESTION #1683

Question 1692

In consumer theory, the marginal utility of consuming a good is most precisely defined as the:

Total utility derived from the good before the last unit is consumed
Additional utility gained from consuming one more unit of the good✔️
Utility derived from consuming a different, substitute good
Consumer surplus generated from the consumption of an alternative good

Correct Answer Logic:

Marginal utility (MU) is the additional (incremental) utility or satisfaction a consumer derives from consuming one more unit of a good, holding all else constant. Mathematically: $MU = \dfrac{\Delta TU}{\Delta Q}$. The Law of Diminishing Marginal Utility states that MU typically declines as more units are consumed. It is the foundational concept in cardinal utility analysis and the derivation of the demand curve.

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General Abilities QUESTION #4562

Question 1693

What is the reciprocal of $\frac{5}{7}$?

$\frac{-5}{7}$
$\frac{7}{5}$✔️
$\frac{5}{7}$
$\frac{1}{35}$

Correct Answer Logic:

Reciprocal of $\frac{a}{b}$ is $\frac{b}{a}$. So reciprocal of $\frac{5}{7}$ is $\frac{7}{5}$

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Physics QUESTION #375

Question 1694

For atomic hydrogen spectrum

which of the following series lies in visible region of electromagnetic spectrum?✔️
Lyman series
Paschen series
Balmer series

Correct Answer Logic:

2

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Civil / Architecture QUESTION #2365

Question 1695

In the design of steel plate girders, the proportioning of the web panel to prevent shear buckling without tension field action requires the shear buckling coefficient $k_v$. For an unstiffened web with $a/h \to \infty$ (no transverse stiffeners), the value of $k_v$ used in calculating the critical shear stress is:

4.0
5.34✔️
6.34
2.0

Correct Answer Logic:

For a web plate with no transverse stiffeners (pure shear panel, $a/h \to \infty$), the shear buckling coefficient is $k_v = 5.34$. When transverse stiffeners are present with aspect ratio $a/h \leq 1$: $k_v = 4.0 + \dfrac{5.34}{(a/h)^2}$. The critical shear stress is $F_{cr} = \dfrac{k_v \pi^2 E}{12(1-\nu^2)(h/t_w)^2}$. AISC uses $k_v = 5.34$ as the baseline for unstiffened webs.

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Dairy Food Science and Technology QUESTION #5985

Question 1696

In dairy, 'thermophilic' starter cultures (used in yoghurt, Swiss cheese, mozzarella) have an optimal growth temperature of:

$10\text{–}20^{\circ}\text{C}$
$37\text{–}45^{\circ}\text{C}$✔️
$55\text{–}65^{\circ}\text{C}$
$25\text{–}30^{\circ}\text{C}$

Correct Answer Logic:

Thermophilic LAB ($S.\;thermophilus$, $L.\;bulgaricus$, $L.\;helveticus$) have optimum growth temperatures of $37\text{–}45^{\circ}\text{C}$. Mesophilic starters ($Lc.\;lactis$, $Leuconostoc$) have optimum at $20\text{–}30^{\circ}\text{C}$. This distinction determines incubation temperature: yoghurt at $40\text{–}43^{\circ}\text{C}$.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3344

Question 1697

'Tuberculin' test (Mantoux test) is an example of which hypersensitivity?

Type I
Type II
Type III
Type IV (Delayed)✔️

Correct Answer Logic:

It takes $48-72$ hours for a positive skin reaction to appear.

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Economics QUESTION #1695

Question 1698

The empirical inverse relationship between the inflation rate and the unemployment rate — suggesting a short-run trade-off between the two — is represented by which of the following economic concepts?

Okun's Law
The Phillips Curve✔️
Say's Law
The U-shaped average cost curve

Correct Answer Logic:

The Phillips Curve (A.W. Phillips, 1958) depicts the empirical inverse relationship between unemployment and inflation: when unemployment is low, inflation tends to be high, and vice versa. It represents the short-run trade-off policymakers face. Okun's Law relates unemployment to GDP growth. Say's Law states supply creates its own demand. The short-run Phillips Curve has been challenged by stagflation and the natural rate hypothesis.

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