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Dairy Food Science and Technology QUESTION #5937

In cheese making, the role of $\text{CaCl}_2$ added to pasteurized milk is to:

Provide flavor to the cheese
Restore ionic calcium ($\text{Ca}^{2+}$) levels reduced during pasteurization, improving gel firmness and reducing coagulation time✔️
Act as a preservative against spoilage bacteria
Lower the $\text{pH}$ to the isoelectric point of casein

Correct Answer Logic:

Pasteurization shifts calcium from ionic ($\text{Ca}^{2+}$) to colloidal/casein-bound forms, reducing ionic calcium concentration. This impairs rennet gel formation. $\text{CaCl}_2$ addition ($0.01\text{–}0.02\%$ w/v) restores $\text{Ca}^{2+}$ levels, improving gel firmness and cutting properties.

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Dairy Food Science and Technology QUESTION #5936

Question 3962

The purpose of 'aging' (tempering) cream at $8\text{–}13^{\circ}\text{C}$ before churning in butter production is to:

Increase the cream's water content
Promote partial crystallization of fat into stable polymorphic crystal forms ($\beta'$) to facilitate efficient churning and improve butter texture✔️
Lower the cream's viscosity for better separation
Allow lactose to ferment producing diacetyl

Correct Answer Logic:

Cream tempering involves temperature cycling to promote formation of stable $\beta'$ and $\beta$ polymorphic crystal forms of triglycerides. Properly crystallized fat churns efficiently and produces butter with good texture, spreadability, and body.

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English QUESTION #4443

Question 3963

The repeated breakdown of negotiations only ____ the view that the two sides were not truly committed to the goal of ____ a military confrontation.

established, escalating
reinforced, averting✔️
undermined, avoiding
None of these

Correct Answer Logic:

Failures in negotiation 'reinforce' (strengthen) the idea that the parties aren't trying to 'avert' (prevent) war.

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Basic Mathematics QUESTION #4523

Question 3964

If $x < 5$, then $x + 3$:

$< 8$✔️
$> 8$
$= 8$
$\geq 8$

Correct Answer Logic:

Adding same value to both sides preserves inequality. $x < 5 \Rightarrow x + 3 < 5 + 3 \Rightarrow x + 3 < 8$

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Physics QUESTION #4387

Question 3965

For two equal positive charges, the electric field is weakest:

Midway between them✔️
Along the perpendicular bisector
Close to either charge
At infinity

Correct Answer Logic:

At the midpoint between two equal positive charges, the electric fields due to each charge are equal in magnitude but opposite in direction, so they cancel out. The resultant electric field is zero (weakest) at this point.

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Chemistry QUESTION #814

Question 3966

How many zones does the charge pass through in a rotary kiln?

4
2
3✔️
5

Correct Answer Logic:

In a rotary kiln used in cement manufacture, the material passes through 3 zones: the drying/preheating zone, the calcination zone, and the clinkering (burning) zone.

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Biology Zoology Botany QUESTION #1334

Question 3967

What is the term for the process by which a caterpillar becomes a butterfly?

Fragmentation
Budding
Metamorphosis✔️
None of these

Correct Answer Logic:

Metamorphosis is the biological process of transformation from an immature larval stage (caterpillar) to a mature adult form (butterfly). In complete metamorphosis (holometabolism), the four stages are egg, larva (caterpillar), pupa (chrysalis), and adult (imago). Fragmentation and budding are asexual reproduction strategies in simpler organisms.

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Geography QUESTION #1244

Question 3968

The colour of a star is an indication of its:

Size
Distance away
Surface temperature✔️
None of these

Correct Answer Logic:

The colour of a star directly indicates its surface temperature. Cool stars (around 3,000 K) appear red; medium-temperature stars like the Sun (~5,500 K) appear yellow-white; hot stars (30,000+ K) appear blue-white. This is described by Wien's Displacement Law. A star's colour does not directly indicate its size or distance.

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Chemistry QUESTION #441

Question 3969

Name the partially miscible liquids from the following?

Alcohol-ether
Nicotine-water✔️
Benzene-water
Both A and B

Correct Answer Logic:

Nicotine-water is partially miscible

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Urdu QUESTION #5090

Question 3970

میر تقی میر کی مشہور مثنوی کون سی ہے؟

خوابِ خیال
شعلۂ عشق
دریائے عشق✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

دریائے عشق میر تقی میر کی مشہور مثنوی ہے۔

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Physics QUESTION #1025

Question 3971

The intensity of transmitted light when a polaroid sheet is placed between two crossed polaroids at $22.5°$ from the polarization axis of one of them is ($I_0$ = intensity after first polaroid):

$\dfrac{I_0}{8}$✔️
$\dfrac{I_0}{16}$
$\dfrac{I_0}{2}$
$\dfrac{I_0}{4}$

Correct Answer Logic:

After first polaroid: $I_0$. After middle polaroid (at $22.5°$): $I_1 = I_0\cos^2 22.5°$. The remaining angle to the second crossed polaroid is $90°-22.5°=67.5°$. After second: $I = I_1\cos^2 67.5° = I_0\cos^2 22.5°\cos^2 67.5°$. Using $\cos22.5°\cos67.5° = \frac{1}{2}\sin45° = \frac{\sqrt{2}}{4}$: $I = I_0\cdot\frac{1}{4}\cdot\sin^2 45° = I_0\cdot\frac{1}{4}\cdot\frac{1}{2} = \frac{I_0}{8}$.

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English QUESTION #2766

Question 3972

Find the word SIMILAR IN MEANING to 'Melancholy'.

Joyful
Cheerful
Sorrowful✔️
Excited

Correct Answer Logic:

'Melancholy' means a feeling of pensive sadness. 'Sorrowful' means feeling or showing grief and sadness — the closest synonym. The other options (Joyful, Cheerful, Excited) are antonyms.

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Mechanical Engineering QUESTION #2435

Question 3973

The undamped natural circular frequency $\omega_n$ of a spring-mass system (mass $m$, spring stiffness $k$) is:

$\omega_n = \sqrt{k/m}$✔️
$\omega_n = \sqrt{m/k}$
$\omega_n = k/m$
$\omega_n = 2\pi\sqrt{m/k}$

Correct Answer Logic:

From the equation of motion $m\ddot{x}+kx=0$, dividing by $m$ gives $\ddot{x}+\omega_n^2 x=0$ where $\omega_n^2=k/m$, hence $\omega_n=\sqrt{k/m}$ rad/s.

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Economics QUESTION #1714

Question 3974

Pakistan's rising public debt-to-GDP ratio — exceeding 70% in recent years — is most comprehensively explained by which combination of fiscal and macroeconomic factors?

Persistently high real interest rates on domestic government borrowing
Over-dependence on concessional bilateral and multilateral foreign loans
Structural primary fiscal deficits compounded by sharp depreciation of the Pakistani Rupee inflating external debt in local currency
All of these✔️

Correct Answer Logic:

Pakistan's public debt accumulation is driven by multiple reinforcing factors: (1) primary deficits — the government consistently spends more than it collects even before debt service, reflecting structural fiscal weakness; (2) high domestic borrowing costs — double-digit policy rates have made debt servicing a dominant budget item; (3) rupee depreciation — each depreciation episode dramatically increases the PKR value of USD-denominated external debt. All three factors have simultaneously operated to inflate Pakistan's debt burden.

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Biology QUESTION #4333

Question 3975

Reversible inhibitors differ from irreversible inhibitors because they:

Bind permanently and cannot be removed
Bind temporarily and can be removed✔️
Permanently inactivate the enzyme
Change enzyme structure permanently

Correct Answer Logic:

Reversible inhibitors bind through weak, non-covalent interactions and can be removed, restoring enzyme activity. Irreversible inhibitors form permanent covalent bonds with the enzyme.

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Pakistan Affairs QUESTION #160

Question 3976

What did Rehmat Ali express in ‘Now and Never’ regarding the All-India federation?

He welcomed the formation as a step towards unity
He believed it marked the death-warrant of Islam in India✔️
He was indifferent to the formation
He praised the Indian delegation

Correct Answer Logic:

Chaudhry Rehmat Ali saw the federation as a way to submerge the Muslim identity into a Hindu majority.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3517

Question 3977

Which drug is used as a 'Demulcent' and is obtained from 'Plantago ovata'?

Ispaghula (Psyllium)✔️
Senna
Digitalis
Cinnamon

Correct Answer Logic:

Ispaghula husk is a bulk-forming laxative and demulcent.

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Chemistry QUESTION #5534

Question 3978

Sucrose undergoes acid hydrolysis via first-order kinetics with a half-life of 3.33 h at 25°C. After 9 h, the fraction of sucrose remaining is $f$. Find the value of $\log_{10}\!\left(\dfrac{1}{f}\right)\times10^{-2}$ (nearest integer). [Given: $\ln 10 = 2.303$, $\ln 2 = 0.693$]

81✔️
90
135
27

Correct Answer Logic:

$k = \frac{0.693}{3.33} = 0.208\ h^{-1}$. After $t=9$ h: $\ln\left(\frac{1}{f}\right) = kt = 0.208\times9 = 1.872$. $\log_{10}\left(\frac{1}{f}\right) = \frac{1.872}{2.303} = 0.8127$. Answer $= 0.8127\times10^{-2}\times10^{2}\approx81\times10^{-2}$, so the value is $\approx 81\times10^{-2}$, meaning the answer = 81.

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