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Correct Answer Logic:
- Total mass of hydrogen in a $75 \text{ kg}$ person = $10\%$ of $75 = 7.5 \text{ kg}$.
- $^1H$ has a mass of approximately $1 \text{ u}$, while $^2H$ (Deuterium) has a mass of $2 \text{ u}$.
- Replacing all $^1H$ with $^2H$ effectively doubles the mass of the hydrogen component.
- Weight gain = New mass - Original mass = $15 \text{ kg} - 7.5 \text{ kg} = 7.5 \text{ kg}$.
Uploaded by: Fani Warraich
Correct Answer Logic:
AI/ML forecasting improves causal intelligence — it captures leading indicators (social sentiment, weather) that precede demand changes, addressing the fundamental weakness of pure time-series models that only extrapolate past patterns. The critical new risk is model opacity: complex neural networks cannot explain their predictions in ways humans can verify or challenge, creating accountability failures when forecasts are wrong and reducing managerial confidence in overriding automated recommendations — the 'automation bias' and 'black box' risks.
Uploaded by: Fani Warraich
Mathematics
QUESTION #1301
Question 3
The characteristic equation of \(3y''-6y'+6y=0\) has roots:
Correct Answer Logic:
Dividing by 3: \(y''-2y'+2y=0\). Characteristic equation: \(r^2-2r+2=0\Rightarrow r=\dfrac{2\pm\sqrt{4-8}}{2}=\dfrac{2\pm 2i}{2}=1\pm i\). Complementary solution: \(y_c=e^x(C_1\cos x+C_2\sin x)\).
Uploaded by: Fani Warraich
Library Sciences
QUESTION #1501
Question 4
The International Standard Bibliographic Description (ISBD) was developed under the auspices of which organization?
Correct Answer Logic:
ISBD was developed by the International Federation of Library Associations and Institutions (IFLA). It standardizes elements and punctuation of bibliographic description to facilitate international exchange of bibliographic data.
Uploaded by: Fani Warraich
Math Physics Chemistry Biology
QUESTION #7774
Question 5
Sickle cell anemia results from what molecular abnormality?
Correct Answer Logic:
Sickle cell anemia is caused by a point mutation (GAG → GTG) in the β-globin gene, replacing glutamate (Glu) with valine (Val) at position 6, causing hemoglobin polymerization.
Uploaded by: Fani Warraich
Chemistry
QUESTION #7172
Question 6
Which of the following values represents a physically possible energy level for an excited state of a hydrogen atom?
Correct Answer Logic:
The energy of an electron in a hydrogen atom is given by $E_{n} = \frac{-13.6}{n^{2}} \text{ eV}$.
- For $n=1$, $E = -13.6 \text{ eV}$ (Ground state)
- For $n=2$, $E = \frac{-13.6}{4} = -3.4 \text{ eV}$
- For $n=3$, $E = \frac{-13.6}{9} = -1.51 \text{ eV}$
Uploaded by: Fani Warraich
General Knowledge
QUESTION #4802
Question 7
The International Day for the Elimination of Violence Against Women is observed annually on which date?
Correct Answer Logic:
The International Day for the Elimination of Violence against Women is observed on November 25 each year, designated by the United Nations to raise awareness about gender-based violence.
Uploaded by: Fani Warraich
Paper-II (Pharmacognosy and Pharmaceutics-I)
QUESTION #3002
Question 8
In an 'Oil-in-Water' (O/W) emulsion, the 'Oil' is the:
Correct Answer Logic:
In O/W, oil droplets are dispersed throughout the water (continuous phase).
Uploaded by: Fani Warraich
Paper-I (Anatomy/Physiology and Biochemistry/Microbiology)
QUESTION #3465
Question 9
'Hemolysis' in a lab tube of blood might be caused by adding:
Security Measures to Maintain Law and Order
QUESTION #868
Question 10
Which code word is internationally recognized for an aircraft "Unlawful Interference" (Hijacking)?
Correct Answer Logic:
Code 7500 is the transponder code used by pilots to discreetly signal a hijacking to Air Traffic Control.
Uploaded by: Fani Warraich
Chemistry
QUESTION #5564
Question 11
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)
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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Correct Answer Logic:
Most attacks occur during business hours when users are active and system activity can blend with normal operations. Requiring MFA only after-hours protects the lower-risk period while leaving the higher-risk business hours protected by only single-factor authentication. The security is inverted from risk-based design.
Uploaded by: Fani Warraich
Accounting & Finance
QUESTION #9662
Question 13
In which system of branch accounting are the accounts Branch Stock Account, Branch Debtors Account, Branch Adjustment Account, and Branch Stock Reserve Account all simultaneously maintained?
Correct Answer Logic:
The Stock and Debtors System uses all six accounts: Branch Stock Account, Branch Debtors Account, Branch Expenses Account, Branch Adjustment Account, Goods Sent to Branch Account, and Branch Stock Reserve Account. This system is used when goods are sent at pro-forma invoice price and the branch is large.
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Urdu
QUESTION #5042
Question 15
اردو شاعری کے علاوہ مرزا غالب نے کس صنفِ نثر میں نام پیدا کیا؟
Correct Answer Logic:
مرزا غالب اردو خطوط نگاری کے بانی سمجھے جاتے ہیں۔ ان کے خطوط اردو نثر کا سرمایہ ہیں۔
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English
QUESTION #2720
Question 16
Identify the NOUN in the sentence: 'The brave soldier fought for his country.'
Paper-I (Anatomy/Physiology and Biochemistry/Microbiology)
QUESTION #3277
Question 17
'Gram-Positive' bacteria appear which color after a successful Gram stain?
Correct Answer Logic:
Gram-positive bacteria retain the crystal violet dye due to their thick peptidoglycan layer.
Uploaded by: Fani Warraich
English
QUESTION #8577
Question 18
What does the phrase 'thinking out of the box' mean?
Correct Answer Logic:
'Think out of the box' means to think creatively and unconventionally.
Uploaded by: Fani Warraich
General Knowledge
QUESTION #4641
Question 19
Four of the following five are similar in a definite way and so form a group. Which one of them does not belong to the group?
General Knowledge
QUESTION #2615
Question 20
A Hard Disk Drive (HDD) works by using:
Correct Answer Logic:
An HDD (Hard Disk Drive) uses a spinning platter and a mechanical arm to read and write information. The platter spins at high RPM (Revolutions Per Minute) while the arm moves across it to access data.
Uploaded by: Fani Warraich
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