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Physics QUESTION #7045

On a hot summer night, air's refractive index is lowest at the ground and increases with height. For a horizontal light beam, Huygens' principle suggests the beam will:

narrow down
travel straight without deflection
bend downwards
bend upwards✔️

Correct Answer Logic:

Light travels faster in a medium with a lower refractive index. Since the refractive index is lowest near the ground, the lower part of the wavefront travels faster than the upper part.

According to Huygens' principle, this causes the wavefront to tilt upwards, causing the beam to bend towards the region of higher refractive index (upwards).

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General Abilities QUESTION #7973

Question 722

$0.26 \div 100 = ?$

0.0026✔️
0.026
26
0.00026

Correct Answer Logic:

$0.26 \div 100 = 0.0026$ (move the decimal point 2 places to the left)

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Statistics QUESTION #2012

Question 723

In the LSD (Least Significant Difference) test for comparing treatment means in ANOVA, two means $\bar{y}_i$ and $\bar{y}_j$ are declared significantly different if:

Their difference exceeds $t_{\alpha/2, df_E} \cdot s_e$
Their difference exceeds $t_{\alpha/2, df_E} \cdot \sqrt{\dfrac{2 MS_E}{b}}$✔️
Their difference exceeds $F_{\alpha, 1, df_E} \cdot MS_E$
Their difference exceeds $z_{\alpha/2} \cdot SE$

Correct Answer Logic:

The LSD test declares means significantly different if $|\bar{y}_i - \bar{y}_j| > LSD$, where $LSD = t_{\alpha/2, df_E} \cdot \sqrt{\dfrac{2 MS_E}{b}}$. This is the critical difference computed from the t-distribution with error degrees of freedom and the standard error of the difference between two means.

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Chemistry QUESTION #7814

Question 724

The efficiency of a chemical reaction is determined by calculating:

Actual yield
Theoretical yield
Percentage yield✔️
Amount of unused reactant

Correct Answer Logic:

Percentage yield = (actual yield/theoretical yield)×100, directly shows reaction efficiency.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3056

Question 725

The abbreviation 'h.s.' (hora somni) means:

During the day
At bedtime✔️
In the morning
Every second hour

Correct Answer Logic:

'h.s.' means at the hour of sleep (bedtime).

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Mathematics QUESTION #1262

Question 726

Which of the following is the solution set of $x^2+x>2$?

($-\infty,-2)\cup(1,\infty)$✔️
($-2,1$)
($-\infty,-1)\cup(2,\infty)$
($-1,2$)

Correct Answer Logic:

Factor: $x^2+x-2>0\Rightarrow(x+2)(x-1)>0$. The product is positive when both factors are positive ($x>1$) or both negative ($x<-2$). Solution: $x\in(-\infty,-2)\cup(1,+\infty)$.

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General Knowledge QUESTION #8802

Question 727

Which is the world's biggest seaport by cargo volume?

Rotterdam (Netherlands)
Shanghai (China)✔️
Naples (Italy)
Seattle (USA)

Correct Answer Logic:

Shanghai is the world's busiest container port.

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Biomedical Sciences QUESTION #3807

Question 728

In respiratory acidosis caused by poor alveolar ventilation, what is the compensatory renal response to correct the blood pH?

Decrease the secretion of $\text{HCO}_3^-$ and thus increase the reabsorption of $\text{H}^+$
Increase the secretion of $\text{HCO}_3^-$ and thus decrease the reabsorption of $\text{H}^+$
Decrease the secretion of $\text{H}^+$ and thus increase the reabsorption of $\text{HCO}_3^-$
Increase the secretion of $\text{H}^+$ and thus increase the reabsorption of $\text{HCO}_3^-$✔️

Correct Answer Logic:

In respiratory acidosis, the kidneys compensate by increasing $\text{H}^+$ secretion and $\text{HCO}_3^-$ reabsorption to raise blood pH back towards normal.

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Quantitative Reasoning QUESTION #7216

Question 729

Imagine wearing special glasses whose lenses made the deep ocean fully transparent, allowing you to observe the seas as they existed centuries ago — before widespread human exploitation began. Even the most (i)_____ observer would quickly notice that fish were far more abundant back then. Similarly, many now-depleted species of marine mammals would appear (ii)_____. Yet without such glasses, the differences between past and present oceans are genuinely hard to (iii)_____.

Blank (i)	Blank (ii)	Blank (iii)
A. casual	D. threatened	G. ignore
B. prescient	E. plentiful	H. discern
C. clearheaded	F. unfamiliar	I. dismiss

Blank (i) = casual, Blank (ii) = plentiful, Blank (iii) = discern✔️
Blank (i) = prescient, Blank (ii) = threatened, Blank (iii) = ignore
Blank (i) = clearheaded, Blank (ii) = unfamiliar, Blank (iii) = dismiss
Blank (i) = casual, Blank (ii) = threatened, Blank (iii) = discern

Correct Answer Logic:

This three-blank question rewards careful reading of each clause.

Blank (i): The sentence argues that even someone not paying close attention would notice the historical difference in fish abundance. This is a rhetorical device lowering the bar — even the most casual (inattentive, uninterested) observer would see it. Using “prescient” (having foresight) or “clearheaded” would raise the bar rather than lower it, weakening the rhetorical effect.

Blank (ii): The passage envisions the past ocean as healthy and full. So those formerly abundant marine mammal species would appear plentiful (abundant, numerous). “Threatened” implies danger, contradicting the image of a healthy past ocean, and “unfamiliar” does not fit the logic.

Blank (iii): Without the magic glasses, we cannot easily perceive or recognize the difference between past and present oceans. Discern means to perceive or recognize clearly — perfect. “Ignore” and “dismiss” imply active rejection, not the passive difficulty of perception described.

Correct Answers: Blank (i) = A (casual), Blank (ii) = E (plentiful), Blank (iii) = H (discern).

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English QUESTION #8326

Question 730

Tick the word SIMILAR in meaning to: Apparel

clothes✔️
luggage
impression
outlook

Correct Answer Logic:

Apparel means clothing.

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General Knowledge QUESTION #8668

Question 731

How much time do sun rays take to reach the Earth?

5 minutes
7 minutes
8 minutes✔️
10 minutes

Correct Answer Logic:

Sunlight takes about 8 minutes and 20 seconds.

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General Knowledge QUESTION #8890

Question 732

The Muslim country with the largest population is:

Bangladesh
Pakistan
Malaysia
Indonesia✔️

Correct Answer Logic:

Indonesia has the largest Muslim population.

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Islamic Studies QUESTION #230

Question 733

At what time is the Kusoof prayer performed?

Wind
Solar eclipse✔️
Lunar eclipse
None of these

Correct Answer Logic:

Salat al-Kusoof is offered during a solar eclipse; Salat al-Khusoof is for a lunar eclipse.

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Academic/Professional (Social Sciences) QUESTION #6486

Question 734

Which research method involves the researcher becoming a part of the group being studied to observe behavior in its natural setting?

Survey
Content Analysis
Participant Observation✔️
Case Study

Correct Answer Logic:

Participant observation is a qualitative method where the researcher immerses themselves in the group's environment.

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Library Sciences QUESTION #1507

Question 735

Which of the following is a major challenge in the organization of information specific to Pakistan?

Overabundance of trained cataloguers
Lack of standardized cataloguing practices and insufficient trained personnel✔️
Excessive adoption of RDA
Surplus of authority files in Urdu

Correct Answer Logic:

A major challenge in Pakistan's information organization environment includes the lack of standardized cataloguing practices, inadequate training of library personnel, limited automation, and the absence of comprehensive authority files for local names and Urdu-language resources.

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Urdu QUESTION #5280

Question 736

اردو کا لفظ پہلی بار کہاں استعمال ہوا؟

آئینِ اکبری
اردو مضامین
تذکرۂ بابری✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

لفظ اردو تذکرۂ بابری میں پہلی بار استعمال ہوا۔

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Pakistan Affairs QUESTION #9086

Question 737

Pakistan officially became the 'Islamic Republic of Pakistan' according to which constitution?

1956 Constitution✔️
1953 Constitution
1962 Constitution
1973 Constitution

Correct Answer Logic:

The 1956 Constitution declared the name.

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Math Physics Chemistry Biology QUESTION #7765

Question 738

Which organism is used in the production of Humulin (human insulin)?

Bacteria✔️
Fungi
Protozoa
Virus

Correct Answer Logic:

Recombinant E. coli (bacteria) or yeast are engineered to produce human insulin (Humulin). Bacteria are most common for large-scale production.

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Islamic Studies QUESTION #7704

Question 739

What is the literal meaning of the term "Sunnah"?

Custom or tradition
Islamic Law
The way or practice✔️
None of these

Correct Answer Logic:

The literal meaning of 'Sunnah' is 'the way' or 'practice'. In Islamic terminology, it refers to the practices, teachings, and actions of Prophet Muhammad (PBUH), which serve as a model for Muslims to follow.

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Boilers Mechanical Engineering QUESTION #4017

Question 740

'Convection' heat transfer in a boiler happens primarily when:

Heat travels through the metal wall
Hot gases flow over the tube surfaces✔️
The sun shines on the boiler
Chemicals are added to the water

Correct Answer Logic:

Radiation happens in the furnace; Conduction happens through the tube walls.

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