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Chemistry QUESTION #5564

Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution? (A free hemiacetal/anomeric –OH is required for reducing sugar property)

The furanose with two free –OH groups on anomeric carbon✔️
The furanose with –OCH₃ at anomeric position
The furanose with –OCOCH₃ at anomeric position
The pyranose with –CH₂OCH₃ group

Correct Answer Logic:

A reducing sugar must have a free anomeric –OH (hemiacetal) that can open to give an aldehyde/ketone form. Option A shows a furanose ring with a free –OH at the anomeric carbon, which can open and reduce. Options B and C have the anomeric –OH blocked as an ether or ester (non-reducing). Option D also has a blocked anomeric position.

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Physics QUESTION #7843

Question 1842

Lenz's law is consistent with:

Ampere's law
Faraday's law
Conservation of energy✔️
Ohm's law

Correct Answer Logic:

Lenz's law ensures energy conservation; induced current opposes change, so work must be done.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3034

Question 1843

'Hygroscopic' powders are those that:

Release water
Absorb moisture from the air but do not liquefy✔️
Absorb moisture and turn into liquid
Explode when wet

Correct Answer Logic:

Hygroscopic powders absorb moisture; if they liquefy, they are called 'Deliquescent'.

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General Knowledge QUESTION #4790

Question 1844

According to Rousseau, legitimate political authority is based on which concept?

Slavery
Force
Social Contract✔️
Divine Right

Correct Answer Logic:

Jean-Jacques Rousseau argued in 'The Social Contract' (1762) that legitimate political authority derives from a social contract among citizens, not from divine right or force.

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Boilers Mechanical Engineering QUESTION #4055

Question 1845

'Boiler Horsepower' (BHP) is equivalent to the evaporation of:

$34.5~lb$ of water per hour from and at $212^\circ\text{F}$✔️
$1~kg$ of water
$1000~lb$ of water
$1~hp$ motor

Correct Answer Logic:

This is an old unit of measure still used in North America for smaller boilers.

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Economics QUESTION #1682

Question 1846

Pareto efficiency encompasses three conditions — productive, allocative, and consumptive efficiency. Which of the following concepts is deliberately excluded from the Pareto efficiency framework?

Consumptive efficiency
Productive efficiency
Allocative efficiency
Equity✔️

Correct Answer Logic:

Pareto efficiency (Pareto optimality) is achieved when no one can be made better off without making someone else worse off. It encompasses three conditions: (1) productive efficiency (on the PPF), (2) allocative efficiency (producing the right mix of goods), and (3) consumptive efficiency (optimal distribution of goods among consumers). Crucially, equity (fairness of distribution) is NOT part of Pareto efficiency — a highly unequal distribution can still be Pareto efficient.

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Nursing QUESTION #9144

Question 1847

A woman with a previous uterine scar (one lower segment CS) is in active labor at 39 weeks. She suddenly develops: severe continuous abdominal pain, fetal bradycardia (FHR 80 bpm), recession of the presenting part, and maternal tachycardia (HR 120/min). The MOST likely diagnosis is:

Placental abruption
Uterine rupture✔️
Severe uterine hyperstimulation
Cord prolapse

Correct Answer Logic:

Uterine Rupture — a catastrophic obstetric emergency. Classic signs (mnemonic: ABCDE of rupture):

Abdominal pain — sudden, severe, tearing/ripping (contractions may cease)
Bleeding (intraperitoneal — minimal external bleeding)
Cessing of contractions (previously regular contractions stop)
Disappearing presenting part (head recedes from pelvis into abdomen)
Emergency fetal distress (sudden prolonged bradycardia)

Additional: Maternal shock (tachycardia, hypotension), loss of uterine contour, tender abdomen.

Risk factors:

Previous uterine scar (LSCS, myomectomy)
Grand multiparity
Prolonged obstructed labor
Oxytocin misuse
Instrumental delivery

Management: Call crash team → IV access × 2, fluids, crossmatch → Immediate laparotomy → Primary repair or hysterectomy depending on extent → Deliver baby (perinatal mortality 50–75% in complete rupture).

Incidence of rupture in scarred uterus: $\approx 0.5{-}1\%$ with LSCS scar (higher with classical CS scar $\approx 4{-}9\%$).

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Chemistry QUESTION #5574

Question 1848

Arrange the following amines in increasing order of basicity: (A) $CH_3CH_2NH_2$, (B) Diethylamine, (C) Trimethylamine, (D) $N$-methyl aniline (Ph–NH–CH₃)

(D) < (C) < (B) < (A)
(D) < (C) < (A) < (B)✔️
(A) < (B) < (C) < (D)
(A) < (B) < (D) < (C)

Correct Answer Logic:

In aqueous solution, basicity order for aliphatic amines: secondary > primary > tertiary (due to solvation). Aromatic amine (D) has lone pair delocalized into benzene ring → least basic. Order: (D) < (C) < (A) < (B). Trimethylamine (C) is tertiary and less basic than primary (A) in aqueous medium due to steric hindrance to solvation.

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Mathematics QUESTION #1253

Question 1849

In the group $(Q^+, *)$ with $a * b = \dfrac{ab}{2}$, what is the inverse of element $a$?

$\dfrac{1}{a}$
$\dfrac{2}{a}$
$\dfrac{4}{a}$✔️
$2a$

Correct Answer Logic:

For inverse $a'$: $a * a' = e = 2 \Rightarrow \dfrac{aa'}{2} = 2 \Rightarrow a' = \dfrac{4}{a}$. Since $a \in Q^+$, $\dfrac{4}{a} \in Q^+$ ✓.

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English QUESTION #8286

Question 1850

Choose the correct sentence:

India attacked on Pakistan in 1965.
India attacked Pakistan in 1965.✔️
India attacks Pakistan in 1965.
India did attacked on Pakistan in 1965.

Correct Answer Logic:

'Attack' is a transitive verb and does not require 'on'.

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Administration QUESTION #9573

Question 1851

The concept of 'public goods' is foundational to justifying government intervention in the economy. Which of the following best identifies a situation where a good that is technically public could lose its non-rival character?

A lighthouse in a busy shipping lane during normal traffic — its guidance signal is available to all ships without depletion
A public park at normal occupancy — all visitors can use it simultaneously without reducing others' enjoyment
A congested public road during peak hours — additional vehicles reduce traffic flow and increase travel time for all existing users✔️
National defence — the protection provided to one citizen does not reduce protection available to others

Correct Answer Logic:

Public goods are non-excludable (cannot prevent use) and non-rival (use by one does not reduce availability for others). Option C describes congestion — when a public road reaches capacity, additional users impose costs on existing users (reduced speed, increased travel time), making the good rival at the margin. This is the concept of 'congestible public goods' or 'club goods,' illustrating that non-rivalry is conditional on usage levels.

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Chemistry QUESTION #7378

Question 1852

Bohr's atomic model is best suited to explain which of the following?

Zeeman effect
Stark effect
Bond formation in $\text{H}_2$
Hydrogen atom spectrum✔️

Correct Answer Logic:

Successes of Bohr's model:

Explains the line spectrum of hydrogen (and hydrogen-like ions)
Correctly predicts wavelengths of Lyman, Balmer, Paschen series

Failures:

Cannot explain multi-electron atoms
Cannot explain Zeeman effect (splitting in magnetic field)
Cannot explain Stark effect (splitting in electric field)
Cannot explain bond formation

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3619

Question 1853

What is the biological source of 'Turmeric' (Haldi)?

Curcuma longa✔️
Zingiber officinale
Crocus sativus
Allium sativum

Correct Answer Logic:

Turmeric comes from the rhizomes of Curcuma longa.

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Egnlish QUESTION #720

Question 1854

"Self-Reliance" is a famous essay by:

Henry David Thoreau
Ralph Waldo Emerson✔️
Walt Whitman
Nathaniel Hawthorne

Correct Answer Logic:

The essay encourages individuals to avoid conformity and follow their own instincts.

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Pakistan Affairs QUESTION #616

Question 1855

How many seats are reserved for women in the National Assembly of Pakistan?

40
50
60✔️
None of these

Correct Answer Logic:

There are 60 seats reserved for women in the National Assembly .

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Pakistan Affairs QUESTION #9111

Question 1856

The fiscal year in Pakistan runs from:

June 1 to June 30
June 15 to July 15
July 1 to June 30✔️
July 1 to August 30

Correct Answer Logic:

Pakistan's fiscal year is July 1 to June 30.

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Administration QUESTION #2919

Question 1857

[Image comparing Merit System vs Spoil System in public employment]

Correct Answer Logic:

No explanation provided for this question.

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General Knowledge QUESTION #8732

Question 1858

The world's largest saltwater lake (by surface area) is:

Lake Baikal
Lake Superior
Caspian Sea✔️
None above

Correct Answer Logic:

The Caspian Sea is the largest enclosed inland body of water.

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English QUESTION #7878

Question 1859

Choose the sentence with the correct tense and sentence structure:

He is going to the market yesterday.
I had been waiting for the bus and it arrives.
She will finish her homework before she went to bed.
They were playing football when it started to rain.✔️

Correct Answer Logic:

Option D correctly uses past continuous ('were playing') for an ongoing action interrupted by another past action ('started to rain' - simple past). The other options mix tenses incorrectly.

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Mathematics QUESTION #4145

Question 1860

Solve $\frac{dy}{\sqrt{1-y^2}} = \frac{dx}{\sqrt{1-x^2}}$ with $y(0) = \frac{\sqrt{3}}{2}$. What is the solution?

$\sin^{-1}(y) = \sin^{-1}(x) + \frac{\pi}{3}$
$\sin^{-1}(y) = \sin^{-1}(x) + \frac{\pi}{6}$
$y = \sin(\sin^{-1}(x) + \frac{\pi}{3})$
Both (A) and (C)✔️

Correct Answer Logic:

Integrating: $\sin^{-1}(y) = \sin^{-1}(x) + C$. At $x=0$, $y=\frac{\sqrt{3}}{2}$: $\frac{\pi}{3} = 0 + C$, so $C = \frac{\pi}{3}$. Thus $\sin^{-1}(y) = \sin^{-1}(x) + \frac{\pi}{3}$, equivalent to $y = \sin(\sin^{-1}(x) + \frac{\pi}{3})$.

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