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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3162

Question 281

Which condition results from a deficiency of 'Vitamin D' in children?

Scurvy
Rickets✔️
Beriberi
Pellagra

Correct Answer Logic:

Rickets causes softening and weakening of bones.

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Mathematics QUESTION #6982

Question 282

Two cards are drawn one after another with replacement from a well-shuffled standard deck of 52 cards. Let $X$ be the number of aces obtained. Find $P(X=1)+P(X=2)$.

$\dfrac{49}{169}$
$\dfrac{52}{169}$
$\dfrac{24}{169}$
$\dfrac{25}{169}$✔️

Correct Answer Logic:

$p=P(\text{ace})=\dfrac{4}{52}=\dfrac{1}{13}$, $q=\dfrac{12}{13}$. Binomial with $n=2$.

$P(X=1)=\binom{2}{1}\cdot\dfrac{1}{13}\cdot\dfrac{12}{13}=\dfrac{24}{169}$

$P(X=2)=\binom{2}{2}\cdot\left(\dfrac{1}{13}\right)^2=\dfrac{1}{169}$

$P(X=1)+P(X=2)=\dfrac{24}{169}+\dfrac{1}{169}=\dfrac{25}{169}$

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Biology QUESTION #7269

Question 283

Nitrogen fixation in root nodules of Alnus is brought about by:

Frankia✔️
Azorhizobium
Bradyrhizobium
Clostridium

Correct Answer Logic:

Frankia is a filamentous actinomycete that forms nitrogen-fixing root nodules (actinorhizal nodules) in non-leguminous plants like Alnus (alder), Casuarina, and Ceanothus. Rhizobium and Bradyrhizobium nodulate legumes; Azorhizobium is stem-nodulating; Clostridium is a free-living anaerobic nitrogen fixer.

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Chemistry QUESTION #7202

Question 284

Which of the following alkali or alkaline earth metals can react directly with atmospheric nitrogen ($N_{2}$) to form a nitride?

$K$
$Li$✔️
$Rb$
$Cs$

Correct Answer Logic:

Among the alkali metals, only Lithium ($Li$) is small enough and has sufficient polarizing power to react directly with $N_{2}$ to form a stable nitride ($Li_{3}N$).
This is a characteristic diagonal relationship property between Lithium and Magnesium.

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Physics QUESTION #7219

Question 285

Match the physical quantities in List I with their correct dimensional formulas in List II:

List I	List II
(A) Spring constant	(1) $M^1L^2T^{-2}$
(B) Pascal (unit of pressure)	(2) $M^0L^0T^{-1}$
(C) Hertz (unit of frequency)	(3) $M^1L^0T^{-2}$
(D) Joule (unit of energy)	(4) $M^1L^{-1}T^{-2}$

Choose the correct matching:

A-3, B-4, C-2, D-1
A-4, B-3, C-1, D-2
A-4, B-3, C-2, D-1✔️
A-3, B-4, C-1, D-2

Correct Answer Logic:

Spring constant $k$: $F = kx \Rightarrow [k] = \frac{[F]}{[x]} = \frac{MLT^{-2}}{L} = MT^{-2} = M^1L^0T^{-2}$ → (3)
Pascal (pressure): $[P] = \frac{Force}{Area} = \frac{MLT^{-2}}{L^2} = ML^{-1}T^{-2} = M^1L^{-1}T^{-2}$ → (4)
Hertz (frequency): $[f] = T^{-1} = M^0L^0T^{-1}$ → (2)
Joule (energy): $[E] = ML^2T^{-2} = M^1L^2T^{-2}$ → (1)

Correct match: A-3, B-4, C-2, D-1

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Statistics QUESTION #2009

Question 286

In the ANOVA table for an RCB design with $SS_{error} = 2.6249$ and error $df = 24$, the standard error for the difference between two treatment means $(\bar{y}_{i.} - \bar{y}_{j.})$ is:

$\sqrt{\dfrac{MS_E}{b}}$
$\sqrt{\dfrac{2 \cdot MS_E}{b}}$✔️
$\sqrt{MS_E}$
$\dfrac{MS_E}{b}$

Correct Answer Logic:

The standard error for comparing two treatment means in RCBD is $SE_{diff} = \sqrt{\dfrac{2 MS_E}{b}}$, where $b$ is the number of blocks (replications per treatment). Here $MS_E = 2.6249/24 = 0.1094$, so $SE_{diff} = \sqrt{2(0.1094)/9} \approx 0.1559$.

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Education QUESTION #6874

Question 287

Which of the following represents the MOST critical distinction between an 'authoritative' teacher and an 'authoritarian' teacher in the context of classroom management?

The authoritative teacher relies on rewards while the authoritarian relies on punishment
The authoritative teacher maintains discipline through mutual respect and firmness, while the authoritarian uses coercive commands and dictatorial control✔️
The authoritative teacher allows permissive student behavior, while the authoritarian enforces strict zero-tolerance policies
The authoritative teacher is effective only in small classes, while the authoritarian approach works in large classes

Correct Answer Logic:

The authoritative teacher establishes clear boundaries and high expectations while maintaining a warm, respectful relationship with students. The authoritarian teacher enforces compliance through power, commands, and coercion without consideration for student agency. Authoritativeness fosters internalized discipline; authoritarianism fosters compliance through fear.

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General Abilities QUESTION #4634

Question 288

What is the value of $2 + 3 \times 4 - 5$?

$15$
$9$✔️
$4$
$20$

Correct Answer Logic:

PEMDAS: $2 + 12 - 5 = 9$

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Security Measures to Maintain Law and Order QUESTION #844

Question 289

"Access Control" at an airport is a security measure primarily intended to:

Count passengers
Maintain Law & Order✔️
Speed up boarding
Reduce staff costs

Correct Answer Logic:

Access control ensures only authorized personnel enter sensitive areas, preventing breaches of order.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3170

Question 290

Which molecule is the main 'Energy Currency' of the cell?

Glucose
DNA
ATP✔️
RNA

Correct Answer Logic:

Adenosine Triphosphate (ATP) stores and releases energy for cellular work.

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Boilers Mechanical Engineering QUESTION #2463

Question 291

The total shear stress $\tau$ in a helical compression spring wire (spring index $C$, axial load $F$, wire diameter $d$) including the Wahl correction factor $K_W$ is:

$\tau = \frac{8FD}{\pi d^3}$
$\tau = K_W \frac{8FD}{\pi d^3} = K_W \frac{8FC}{\pi d^2}$✔️
$\tau = \frac{16FD}{\pi d^3}$
$\tau = K_W \frac{4F}{\pi d^2}$

Correct Answer Logic:

The nominal shear stress in a helical spring is $\tau_{nom}=8FD/(\pi d^3)=8FC/(\pi d^2)$. The Wahl correction factor $K_W=\frac{4C-1}{4C-4}+\frac{0.615}{C}$ accounts for curvature effect and direct shear.

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Urdu QUESTION #5250

Question 292

ریختے کے تمہیں استاد نہیں ہو غالب، یہ شعر مرزا غالب نے کس کے لیے کہا؟

مومن خان مومن
میر تقی میر✔️
ابنِ انشا
ان میں سے کوئی نہیں

Correct Answer Logic:

یہ شعر مرزا غالب نے میر تقی میر کے لیے کہا جن کی شاعری کو وہ بہت سراہتے تھے۔

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Chemistry QUESTION #463

Question 293

The mobile phase in paper chromatography is usually

An organic liquid✔️
Sulphuric acid
Water
Silver nitrate

Correct Answer Logic:

Organic solvents are typically used as mobile phase

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Geography QUESTION #6347

Question 294

The 'Brandt Line' historically divided:

Communist and capitalist countries during Cold War
Developed (Global North) and developing (Global South) countries✔️
Colonial powers and colonized territories
Democratic and authoritarian regimes

Correct Answer Logic:

The Brandt Line (1980 Brandt Report) roughly divided wealthy developed countries (Global North - above the line) from poorer developing countries (Global South - below the line) at approximately 30°N latitude, highlighting global economic inequality patterns.

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Dairy Food Science and Technology QUESTION #5968

Question 295

The 'tempering' cream before butter making promotes:

Rapid melting of all fat crystals for uniform consistency
Partial crystallization of fat into stable polymorphic forms ($\beta'$) facilitating efficient churning and good butter texture✔️
Complete solidification of all fat preventing overworking
Formation of large unstable $\alpha$-form crystals that improve spreadability

Correct Answer Logic:

Cream tempering temperature cycling (e.g. cooling to $8^{\circ}\text{C}$ then warming to $20^{\circ}\text{C}$ then re-cooling to $13^{\circ}\text{C}$) promotes $\beta'$ polymorphic crystal forms of milk fat triglycerides. With $\approx 50\%$ crystalline fat, cream churns most efficiently.

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Physics QUESTION #366

Question 296

Beta ray emitted by a radioactive substance is:

An electron which was existing outside the nucleus
An electron which was existing inside the nucleus
An electron emitted by the nucleus as a result of the decay of neutron inside the nucleus✔️
A pulse of electromagnetic wave

Correct Answer Logic:

Beta decay occurs when a neutron converts to a proton and emits an electron from the nucleus

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Dairy Food Science and Technology QUESTION #5932

Question 297

Which fatty acid is present in highest concentration in milk fat by weight?

Butyric acid (C4:0)
Oleic acid (C18:1, n-9) — approximately $25\text{–}30\%$ of total fatty acids✔️
Lauric acid (C12:0)
Linoleic acid (C18:2)

Correct Answer Logic:

Oleic acid (C18:1, n-9) is the most abundant fatty acid in bovine milk fat by weight ($\approx 25\text{–}30\%$ of total FA). Butyric acid (C4:0) gives dairy its unique flavor when released by lipolysis but is present at only $\approx 3\text{–}5\%$.

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