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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).

Uploaded by: Fani Warraich
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)
Uploaded by: Fani Warraich
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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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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