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MBBS QUESTION #10327

In the liver, bilirubin is conjugated with glucuronic acid — a step essential for its water solubility and biliary excretion — by which enzyme, which is deficient (to varying degrees) in Gilbert and Crigler-Najjar syndromes?

UDP-glucuronyl transferase (UGT1A1)✔️
Biliverdin reductase
Heme oxygenase
Bilirubin oxidase

Correct Answer Logic:

UDP-glucuronyl transferase conjugates bilirubin with glucuronic acid, converting it to the water-soluble form that can be excreted in bile; partial deficiency causes the mild, usually benign unconjugated hyperbilirubinemia of Gilbert syndrome, while near-complete or complete deficiency causes the more severe Crigler-Najjar syndrome.

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Physics QUESTION #1050

Question 4522

A balloon of surface tension $S$, outlet area $A$, gas density $\rho$, radius $R$. Gas flows out: radius changes from $R$ to 0 in time $T$. Speed $v(r)\propto r^a$ and $T\propto S^\alpha A^\beta \rho^\gamma R^\delta$. Then:

$a=-\frac{1}{2},\alpha=-\frac{1}{2},\beta=-1,\gamma=\frac{1}{2},\delta=\frac{7}{2}$✔️
$a=\frac{1}{2},\alpha=\frac{1}{2},\beta=-\frac{1}{2},\gamma=\frac{1}{2},\delta=\frac{7}{2}$
$a=\frac{1}{2},\alpha=\frac{1}{2},\beta=-1,\gamma=+1,\delta=\frac{3}{2}$
$a=-\frac{1}{2},\alpha=-\frac{1}{2},\beta=-1,\gamma=-\frac{1}{2},\delta=\frac{5}{2}$

Correct Answer Logic:

Pressure inside balloon $=\frac{4S}{r}$. By Bernoulli: $\frac{4S}{r}=\frac{1}{2}\rho v^2\Rightarrow v=\sqrt{\frac{8S}{\rho r}}\propto r^{-1/2}$. So $a=-\frac{1}{2}$. For time: $T\propto \frac{R}{v(R)}\cdot f(geometry)$. Dimensional analysis of $T\propto S^\alpha A^\beta\rho^\gamma R^\delta$ with $[T]=s$ gives $\alpha=-1/2, \beta=-1, \gamma=1/2, \delta=7/2$.

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Islamic Studies QUESTION #644

Question 4523

During the Second Pledge of al-'Aqaba, ________ men and two women offered an oath of allegiance to the Prophet Muhammad (ﷺ).

73✔️
63
83
None of these

Correct Answer Logic:

73 men and 2 women from Madina took the second pledge at Aqaba.

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English Literature QUESTION #663

Question 4524

"Why I Am Not a Christian" is an essay by:

Bertrand Russell✔️
T. S. Eliot
Ralph Waldo Emerson
George Orwell

Correct Answer Logic:

This influential essay was based on a talk given by Russell in 1927.

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Administration QUESTION #2911

Question 4525

What term describes the integration of private-sector business methodologies into the management of public services?

Public Administration
Public Management✔️
New Public Service
New Public Management

Correct Answer Logic:

Public Management focuses on the efficiency and effectiveness of government operations by adopting business-like practices.

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Home Economics QUESTION #6238

Question 4526

A 'selvage' in textile science refers to:

The decorative embroidery
The finished edge of a fabric✔️
A type of synthetic dye
The width of the loom

Correct Answer Logic:

The selvage prevents the fabric from unraveling during the manufacturing process.

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Physics QUESTION #997

Question 4527

A tube of length $L$ has radius 2 cm at point (1) and 1 cm at point (2). If velocity of water entering at point (1) is $2\ \text{m/s}$, the velocity of water leaving at point (2) will be:

4 m/s
2 m/s
6 m/s
8 m/s✔️

Correct Answer Logic:

By continuity equation: $A_1 v_1 = A_2 v_2$. $\pi(2)^2 \times 2 = \pi(1)^2 \times v_2 \Rightarrow v_2 = \frac{4\times2}{1} = 8\ \text{m/s}$.

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Physics QUESTION #387

Question 4528

Two cylinders of equal mass are made from same material. The one with the larger diameter accelerates __________ the other under the action of same torque.

Faster than✔️
Slower than
Equal to
None of these

Correct Answer Logic:

Smaller moment of inertia leads to faster acceleration

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English QUESTION #2698

Question 4529

Select the correctly punctuated possessive form:

The childrens' toys are here.
The children's toys are here.✔️
The childrens toys are here.
The childrens's toys are here.

Correct Answer Logic:

'Children' is already plural; to show possession, add 's.

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English QUESTION #8498

Question 4530

Smoking is injurious _______ health.

to✔️
for
with
of

Correct Answer Logic:

'Injurious to' is correct.

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Maths QUESTION #4593

Question 4531

Expand: $(x + 3)(x + 2)$

$x^2 + 5x + 6$✔️
$x^2 + 6$
$2x + 5$
$x^2 + 3x + 2$

Correct Answer Logic:

$(x+3)(x+2) = x^2 + 2x + 3x + 6 = x^2 + 5x + 6$

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Economics QUESTION #1688

Question 4532

The doctrine of comparative advantage predicts that mutual gains from international trade arise when:

Both absolute and comparative advantage are present in both trading countries simultaneously
Opportunity costs for the same good are identical across all trading partners
Significant economies of scale exist in both trading economies
Each country specialises in producing goods in which its relative opportunity cost is lowest✔️

Correct Answer Logic:

David Ricardo's Law of Comparative Advantage (1817) states that a country should specialise in and export the good in which it has the lowest opportunity cost (relative efficiency), even if it is absolutely less efficient at producing all goods. The key is relative (comparative) not absolute efficiency. Gains from trade arise from differences in opportunity costs — not from their equality.

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General Knowledge QUESTION #8886

Question 4533

The famous Muslim saint Baba Farid Ganj Shakar is buried at which city?

Jhang
Multan
Pakpattan✔️
Kot Mithan

Correct Answer Logic:

Baba Farid's shrine is in Pakpattan.

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Dairy Food Science and Technology QUESTION #5933

Question 4534

The inhibitory system in raw milk providing natural antimicrobial protection is:

The complement system
The lactoperoxidase-thiocyanate-$\text{H}_2\text{O}_2$ (LP) system: $\text{H}_2\text{O}_2 + \text{SCN}^- \xrightarrow{\text{LPO}} \text{OSCN}^-$✔️
The lactoferrin-iron sequestration system
The lysozyme-murein lysis system

Correct Answer Logic:

The LP system: $\text{H}_2\text{O}_2$ (substrate) $+$ $\text{SCN}^-$ $+$ lactoperoxidase (enzyme) $\rightarrow$ hypothiocyanite ($\text{OSCN}^-$) that oxidizes microbial sulfhydryl groups, inhibiting bacterial growth. This system provides $\approx 2\text{–}3$ hours of protection in raw milk at ambient temperature.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3378

Question 4535

The 'Inversion' of sugar refers to the hydrolysis of sucrose into:

Glucose and Galactose
Glucose and Fructose✔️
Two Glucose molecules
Starch and Water

Correct Answer Logic:

The resulting mixture is called 'Invert Sugar' because the optical rotation changes.

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Mathematics QUESTION #6944

Question 4536

Count the total number of $3\times3$ matrices of the form $A=\begin{pmatrix}0&2y&1\\2x&y&-1\\2x&-y&1\end{pmatrix}$ with $x,y\in\mathbb{R},\ x\neq y$, satisfying $A^TA=3I_3$.

2
3
6
4✔️

Correct Answer Logic:

Compute $A^TA = 3I_3$ by equating columns to be orthogonal with magnitude $\sqrt{3}$.

Column 1 norm$^2$: $0+(2x)^2+(2x)^2=8x^2=3 \Rightarrow x^2=\frac{3}{8}$: 2 values of $x$.

Column 2 norm$^2$: $4y^2+y^2+y^2=6y^2=3 \Rightarrow y^2=\frac{1}{2}$: 2 values of $y$.

With $x\neq y$: we need to discard cases where $x=y$. Since $x^2=3/8$ and $y^2=1/2$, $x\neq\pm y$ (different magnitudes), so all $2\times2=4$ combinations are valid.

Total $= \mathbf{4}$

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Math Physics Chemistry Biology QUESTION #4268

Question 4537

Which component of a reflex arc connects the sensory neuron to the motor neuron within the spinal cord?

Receptor
Effector
Muscle fiber
Associative neuron✔️

Correct Answer Logic:

The associative neuron (interneuron) is located in the spinal cord and connects the sensory (afferent) neuron to the motor (efferent) neuron in a reflex arc.

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General Knowledge QUESTION #4797

Question 4538

WAFA news agency is affiliated with which country or entity?

Palestine✔️
Jordan
Syria
Lebanon

Correct Answer Logic:

WAFA (Wakalat Anba'a Falastiniyya) is the official Palestinian National News Agency, established in 1972 and serving as the news agency of the Palestinian Authority.

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Agronomy QUESTION #2067

Question 4539

In an additive intercropping system, the total plant population of each component crop compared to its sole crop population is:

Reduced by 50% for each component crop
Maintained at the full sole crop density for each component — extra land area is effectively 'added' to accommodate both crops, unlike replacement series where populations are reduced✔️
Determined only by the LER value of the previous season
Equalized between the two component crops regardless of their sole crop densities

Correct Answer Logic:

In additive intercropping, one crop (main crop) is maintained at its full sole crop density and the intercrop (sub-crop) is added into the existing arrangement — no reduction in either component's population relative to sole cropping. This contrasts with replacement (substitutive) intercropping, where populations are proportionally reduced. Additive systems maximize total productivity.

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Verbal Reasoning QUESTION #8098

Question 4540

Given that $r > s > 0$, compare the two quantities below.

Column A: $\dfrac{rs}{r}$

Column B: $\dfrac{rs}{s}$

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:

Simplify each expression:

Column A: $\dfrac{rs}{r} = s$
Column B: $\dfrac{rs}{s} = r$

Since we are given $r > s > 0$, it follows that $r > s$.

Therefore Column B ($r$) is greater than Column A ($s$).

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