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Chemistry QUESTION #4360

Acetaldehyde undergoes oxidation to produce acetic acid. In this reaction, the oxidizing agent used is:

HI
$LiAlH_4$
$K_2Cr_2O_7$✔️
$NaBH_4$

Correct Answer Logic:

$CH_3CHO$ is oxidized to $CH_3COOH$ (acetic acid). $K_2Cr_2O_7$ (potassium dichromate) is the oxidizing agent. $LiAlH_4$ and $NaBH_4$ are reducing agents.

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English QUESTION #499

Question 2

A day later he reached his first glimpse of Lahore.

A day later he reached his first glimpse of Lahore.
A day later he took his first glimpse of Lahore.
A day later he found his first glimpse of Lahore.
A day later he caught his first glimpse of Lahore.✔️

Correct Answer Logic:

'Caught his first glimpse' is idiomatic

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3343

Question 3

'Lysis' of a cell means the cell:

Divides
Bursts or dissolves✔️
Shrinks
Moves faster

Correct Answer Logic:

Bacteriophages (viruses) often cause lysis of their bacterial hosts.

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English QUESTION #4421

Question 4

'She was elated when she got first position in exams.' What is the meaning of 'elated' in this sentence?

Disappointed
Worried
Excited✔️
Mad

Correct Answer Logic:

'Elated' means extremely happy, joyful, or thrilled. It is used to describe a feeling of great happiness and pride — in this context, the happiness of getting first position. 'Excited' is the closest in meaning among the options.

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Boilers Mechanical Engineering QUESTION #4040

Question 5

'Total Dissolved Solids' (TDS) is measured using:

A thermometer
A conductivity meter✔️
A weighing scale
A ruler

Correct Answer Logic:

Electrical conductivity of water increases with the amount of dissolved salts.

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The Title 28 of the United States Code QUESTION #3717

Question 6

A buyer and seller agree on the sale of a unique antique vase for $\text{\$50,000}$. Before delivery, the vase is destroyed in a fire through no fault of the seller. What is the status of the contract?

The seller must find an identical vase or pay damages.
The contract is discharged by impossibility/frustration of purpose.✔️
The buyer must still pay the $\text{\$50,000}$ because risk of loss passed at the time of the contract.
The seller is in breach for failure to deliver.

Correct Answer Logic:

Under the doctrine of impossibility (or impracticability), if the subject matter of the contract is destroyed without the fault of either party, the duties under the contract are discharged.

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Basic Mathematics QUESTION #2824

Question 7

Solve for $x$: $3x - 7 = 2x + 5$

10
12✔️
14
15

Correct Answer Logic:

$3x - 7 = 2x + 5$. Subtract $2x$ from both sides: $x - 7 = 5$. Add 7: $x = 12$.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3636

Question 8

The term 'Biological Source' includes:

The Genus and Species only
The Genus, Species, Family, and Part used✔️
The price of the drug
The name of the farmer

Correct Answer Logic:

A complete biological source specifies the exact identity and the part of the plant.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3480

Question 9

Which classification system is most useful for detecting 'Adulteration' in organized drugs?

Chemical
Taxonomical
Morphological✔️
Alphabetical

Correct Answer Logic:

Morphological classification studies the external features, making it easier to spot physical substitutes.

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Agronomy QUESTION #2093

Question 10

Osmotic adjustment in crops under drought stress is the process by which:

Plants shed their leaves to reduce total transpiring surface area
Cells actively accumulate compatible solutes (proline, glycine betaine, soluble sugars, K⁺) in the cytoplasm and vacuole, lowering osmotic potential and maintaining turgor pressure and metabolic function at lower soil water potentials — enabling continued growth and gas exchange✔️
Roots lose their selective permeability, allowing free water movement into depleted cells
Stomata permanently close to prevent any further water loss

Correct Answer Logic:

Osmotic adjustment (osmoregulation) is an active cellular response to water deficit: solutes accumulate without causing toxicity, lowering $\psi_s$ (osmotic potential) and maintaining positive turgor pressure ($\psi_p = \psi_w - \psi_s$) at lower leaf water potentials. This sustains stomatal opening, photosynthesis, root elongation into dry soil, and metabolic processes — a key drought tolerance mechanism quantified by the Pressure-Volume curve.

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Others section QUESTION #4810

Question 11

An index that estimates the true purchasing power exchange rate among different currencies is called?

Human Development Index
Exchange Rate
Purchasing Power Parity✔️
Trade Weighted Index

Correct Answer Logic:

Purchasing Power Parity (PPP) is an economic theory and index that adjusts exchange rates to reflect the relative purchasing power of currencies in their home countries, enabling more accurate economic comparisons.

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Biology QUESTION #4250

Question 12

Receptors that are located in the retina of eye are called:

Merkel disc
Ruffini endings
Pacinian corpuscles
Rod and Cone✔️

Correct Answer Logic:

Rod and cone cells are photoreceptors in retina.

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Commerce QUESTION #1211

Question 13

In a sales mix decision, the product with the highest contribution margin per unit should be:

Sold exclusively, regardless of customer demand.
Prioritized when resources are constrained.✔️
Avoided to reduce risk.
Discounted to maximize revenue.

Correct Answer Logic:

When resources (such as machine hours or materials) are constrained, products should be ranked by contribution margin per unit of the limiting factor (not just per unit). The product yielding the highest contribution margin per scarce resource should be prioritized to maximize total contribution and profit. Selling exclusively ignores demand and other constraints.

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Pakistan Affairs QUESTION #593

Question 14

In 1945 Maulana Abul kalam Azad was the President of:

All-India Muslim League
Indian National Congress✔️
Jamiat al Ulama i Hind
None of These

Correct Answer Logic:

He served as the President of the INC from 1940 to 1946.

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Basic Mathematics QUESTION #2894

Question 15

What comes next? $3, 6, 11, 18, 27, \dots$

36
38✔️
34
40

Correct Answer Logic:

The pattern of differences is $+3, +5, +7, +9$. Next is $+11$, so $27+11=38$.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3336

Question 16

Which of the following is a 'Primary' lymphoid organ?

Lymph nodes
Spleen
Bone Marrow✔️
Tonsils

Correct Answer Logic:

Bone marrow and thymus are primary; nodes and spleen are secondary.

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Basic Mathematics QUESTION #2843

Question 17

At what rate of Simple Interest will Rs. 4500 amount to Rs. 5400 in 4 years?

4%
5%✔️
6%
7%

Correct Answer Logic:

SI $= 5400 - 4500 = 900$. Using $SI = \dfrac{P \times R \times T}{100}$: $900 = \dfrac{4500 \times R \times 4}{100} \Rightarrow 900 = 180R \Rightarrow R = 5\%$.

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