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Chemistry QUESTION #7521

A 10 mg effervescent tablet releases 0.25 mL of CO$_2$ at $T = 298.15$ K and $p = 1$ bar. The molar volume of CO$_2$ under these conditions is 25.0 L. The tablet contains sodium bicarbonate (NaHCO$_3$, molar mass = 84 g mol$^{-1}$). What is the percentage of NaHCO$_3$ in each tablet?

0.84%
33.60%
16.80%
8.40%✔️

Correct Answer Logic:

Moles of CO$_2 = \dfrac{0.25 \times 10^{-3}\ \text{L}}{25.0\ \text{L mol}^{-1}} = 1.0 \times 10^{-5}\ \text{mol}$

Reaction: $\text{NaHCO}_3 + \text{H}^+ \to \text{Na}^+ + \text{H}_2\text{O} + \text{CO}_2$

Moles of NaHCO$_3 = 1.0 \times 10^{-5}\ \text{mol}$

Mass of NaHCO$_3 = 1.0 \times 10^{-5} \times 84 = 8.4 \times 10^{-4}\ \text{g} = 0.84\ \text{mg}$

$\% = \dfrac{0.84}{10} \times 100 = \mathbf{8.4\%}$

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English QUESTION #8518

Question 2

The opposite of Hostile is:

aggressive
friendly✔️
cunning
lovely

Correct Answer Logic:

Hostile means unfriendly; opposite is friendly.

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Maths QUESTION #4633

Question 3

If a car travels $180$ km in $3$ hours, what is its average speed?

$60$ km/h✔️
$183$ km/h
$177$ km/h
$540$ km/h

Correct Answer Logic:

Speed = $\frac{\text{distance}}{\text{time}} = \frac{180}{3} = 60$ km/h

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Math Physics Chemistry Biology QUESTION #814

Question 4

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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Federal Rules of Evidence (US) QUESTION #3784

Question 5

In a civil case, the court takes 'judicial notice' of the fact that it was raining in the city on July 4th, 2023, based on certified weather records. The court instructs the jury that they 'must accept this fact as conclusive.' Is this instruction proper?

No, in civil cases, the jury has the discretion to reject judicially noticed facts.
Yes, in civil cases, the court must instruct the jury to accept a judicially noticed fact as conclusive under Rule 201(f).✔️
No, judicial notice is only for 'law,' not 'facts.'
Yes, but only if the parties stipulated to the fact beforehand.

Correct Answer Logic:

Rule 201(f) states that in a civil action, the court must instruct the jury to accept the noticed fact as conclusive. In a criminal case, however, the court must instruct the jury that it *may or may not* accept the fact as conclusive.

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HR and Management QUESTION #6479

Question 6

The concept of 'retention of workforce' specifically focuses on:

Preventing any employee departures
Preventing undesirable detachments of talented and motivated workers✔️
Reducing total headcount systematically
Eliminating performance-based terminations

Correct Answer Logic:

Retention focuses on preventing undesirable detachments of talented and motivated workers. The goal isn't zero turnover (some turnover is healthy), but rather keeping high-value employees who contribute significantly to organizational success.

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Bio-Technology QUESTION #10621

Question 7

Metabolic flux analysis (MFA) uses stoichiometric models to:

Predict the three-dimensional structure of metabolic enzymes
Quantify intracellular fluxes through metabolic pathways from measured extracellular rates✔️
Determine the genome sequence of industrially relevant microorganisms
Control bioreactor temperature and pH in real time

Correct Answer Logic:

Metabolic Flux Analysis (MFA) uses a stoichiometric model of intracellular reactions and measured extracellular rates (substrate uptake, product secretion, O₂ consumption, CO₂ evolution) to calculate intracellular fluxes by solving the mass balance equation: $\mathbf{S} \cdot \mathbf{v} = 0$ at pseudo-steady state. ¹³C-MFA uses isotope labelling to resolve fluxes in parallel pathways. MFA is essential for identifying bottlenecks in metabolic engineering projects.

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Library Sciences QUESTION #1544

Question 8

Sajjad-ur-Rehman's (1993) 'Elm-e-Intezamyat' is significant for Pakistani library science because it:

Introduced Western cataloguing standards to Pakistan
Provided a comprehensive treatment of management theory applied to libraries in the Urdu language✔️
Established the first library school in Pakistan
Documented the history of public libraries in Punjab

Correct Answer Logic:

Sajjad-ur-Rehman's 'Elm-e-Intezamyat: Taaruf aur kutub khano par etlaq' is significant as one of the few comprehensive works on library management written in Urdu, making management theory and its application to Pakistani library settings accessible to local professionals and students.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3160

Question 9

'Jaundice' is characterized by yellowing of the skin due to high levels of:

Iron
Bilirubin✔️
Glucose
Calcium

Correct Answer Logic:

Bilirubin buildup is often a sign of liver or gallbladder problems.

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Education QUESTION #10900

Question 10

Project method
Textbook method
Lecture method✔️
Inquiry method

Correct Answer Logic:

The lecture method is the most universally popular teaching method across all educational levels — from primary schools to universities. Despite its limitations (passive students, one-way communication, ignores individual differences), it remains dominant because it is economical, can cover large amounts of content quickly, requires minimal materials, can reach large groups simultaneously, and teachers are most trained in it. Its universality and practicality make it the most widely used method globally.

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MBBS QUESTION #10277

Question 11

A patient with syringomyelia presents with loss of pain and temperature sensation in a 'cape-like' distribution over the shoulders and upper limbs, while vibration and proprioception (dorsal column function) remain intact. This selective loss is best explained by damage to:

The decussating fibers of the lateral spinothalamic tract as they cross in the anterior white commissure near the syrinx✔️
Both dorsal columns bilaterally, sparing all other tracts
Both corticospinal tracts bilaterally
The dorsal root ganglia bilaterally, sparing the spinal cord itself

Correct Answer Logic:

A syrinx (fluid-filled cavity) typically expands in the central spinal cord, first damaging the decussating spinothalamic fibers crossing in the anterior white commissure at that level, causing a segmental, bilateral loss of pain/temperature sensation while sparing the more peripherally located dorsal columns — the classic 'cape-like' or 'suspended' sensory loss.

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FIA Act QUESTION #9987

Question 12

Pending inquiries of the Special Police at the time of repeal were to be:

Abated
Continued by the Agency✔️
Transferred to Provincial Police
Referred to the High Court

Correct Answer Logic:

Any pending inquiry/investigation continued to be conducted by the Agency.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3308

Question 13

'Aerosols' are a major route of transmission for which type of diseases?

Foodborne
Waterborne
Airborne (Respiratory)✔️
Vector-borne

Correct Answer Logic:

Tiny droplets suspended in the air can carry pathogens like those causing TB or Flu.

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Islamic Studies QUESTION #216

Question 14

Which event significantly contributed to the spread of Islam in the Peninsula?

Migration to Medina
Treaty of Hudaybiyyah
Conquest of Makka✔️
None of these

Correct Answer Logic:

The peaceful conquest of Makkah led to mass conversions across Arabia.

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General Knowledge QUESTION #8971

Question 15

The area inside a computer frame where data and instructions are stored is called:

Memory✔️
Recorder
Hopper
Interpreter

Correct Answer Logic:

Computer memory stores data and instructions.

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Civil Procedure QUESTION #5666

Question 16

A plaintiff moves for summary judgment under Rule 56. The defendant opposes the motion with an affidavit from a witness that contains hearsay. The plaintiff does not object to the affidavit. The court grants summary judgment. On appeal, can the plaintiff raise the hearsay objection for the first time?

Yes, because hearsay is inherently unreliable and the court should have excluded it sua sponte.
No, because a party must object to the admissibility of evidence in a summary judgment motion to preserve the issue for appeal.✔️
Yes, because Rule 56 requires 'admissible' evidence, and hearsay is not admissible.
No, because summary judgment rulings are reviewed de novo and the appellate court will ignore the hearsay anyway.

Correct Answer Logic:

Generally, evidentiary objections not raised in the trial court are waived. In the context of summary judgment, if a party fails to move to strike or otherwise object to an affidavit, the objection is usually waived.

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Accounting & Finance QUESTION #1217

Question 17

An auditor should not accept a loan on favourable commercial terms from an audit client because of the threat to independence. The threat would be a:

Self-interest threat✔️
Self-review threat
Advocacy threat
Familiarity threat

Correct Answer Logic:

Accepting a loan on favorable terms from an audit client creates a self-interest threat — the auditor gains a personal financial benefit from the client relationship, which could consciously or subconsciously influence their judgment. The auditor's financial interests become aligned with the client's, compromising independence.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3440

Question 18

'Ketone Bodies' (like Acetone) are produced when there is excessive metabolism of:

Glucose
Fats✔️
Proteins
Vitamins

Correct Answer Logic:

Common in untreated diabetes or very low-carb diets.

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Geography QUESTION #6315

Question 19

Which Green Revolution innovation had the most significant impact on wheat and rice yields in developing countries during 1960s-1980s?

Chemical fertilizers and pesticides
High-yielding variety (HYV) seeds with dwarfing genes✔️
Mechanization with tractors and harvesters
Irrigation infrastructure expansion

Correct Answer Logic:

HYV seeds with semi-dwarf genes (from Norman Borlaug's wheat, IR8 rice) were the cornerstone innovation. Dwarfing prevented lodging, allowing plants to support heavier grain heads and respond to fertilizer without falling over, dramatically increasing yields.

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Maths QUESTION #2853

Question 20

A cylinder has radius 5 cm and height 14 cm. Find its volume. (Take $\pi = \dfrac{22}{7}$)

1100 cm³✔️
1150 cm³
1200 cm³
1250 cm³

Correct Answer Logic:

Volume of cylinder $= \pi r^2 h = \dfrac{22}{7} \times 5^2 \times 14 = \dfrac{22}{7} \times 25 \times 14 = 22 \times 25 \times 2 = 1100 \text{ cm}^3$.

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