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Physics QUESTION #988

Question 1901

Given statements about thermodynamic variables: (A) Internal energy, volume $V$, and mass $M$ are extensive. (B) Pressure $P$, temperature $T$ and density $\rho$ are intensive. (C) Volume $V$, temperature $T$ and density $\rho$ are intensive. (D) Mass $M$, temperature $T$ and internal energy are extensive. The correct statements are:

(B) and (C) Only
(C) and (D) Only
(D) and (A) Only
(A) and (B) Only✔️

Correct Answer Logic:

Extensive variables scale with system size: internal energy, volume, mass — so (A) is correct. Intensive variables are independent of size: $P$, $T$, $\rho$ — so (B) is correct. (C) is wrong because volume $V$ is extensive. (D) is wrong because $T$ is intensive.

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Chemistry QUESTION #7814

Question 1902

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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Accounting & Finance QUESTION #6083

Question 1903

Which of the following statements regarding drawings is/are correct?

They represent a decrease in the owner's investment in the business.
They must always be less than the total profit for the year.
They constitute the salary paid to the owner.

1 and 2
1 only✔️
2 and 3
3 only

Correct Answer Logic:

Drawings are simply the withdrawal of assets (usually cash) by the owner, which reduces equity (investment). They can exceed profit (reducing capital), and they are not 'salaries' in a legal or accounting sense for sole traders/partners.

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Constitutional Law QUESTION #5832

Question 1904

A federal law provides that 'any state that accepts federal healthcare funding must waive its sovereign immunity to lawsuits in federal court for violations of the ADA.' Is this valid?

No, because Congress cannot force a state to waive its 11th Amendment immunity.
No, because it is an unconstitutional 'commandeering' of state governments.
Yes, because Congress may condition federal funds on a waiver of sovereign immunity under the Spending Power.✔️
Yes, because the 14th Amendment gives Congress power to abrogate state immunity.

Correct Answer Logic:

Congress can condition the receipt of federal funds on a state’s waiver of 11th Amendment immunity. As long as the waiver is 'clear and unequivocal' and the state accepts the money, the waiver is valid.

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Tourism & Hospitality Management QUESTION #1596

Question 1905

The Pakistan Tourist Destinations course requires students to develop which practical skill through field visits?

Financial analysis of tourism businesses
Preparation of a visit report documenting tourist destinations observed✔️
Management of hotel front office operations
Designing a tourism marketing campaign

Correct Answer Logic:

The Pakistan Tourist Destinations course includes a practical component (Module 7) requiring students to conduct Visits to tourist destinations and prepare a visit report — applying classroom knowledge of tourist resources, facilities, and circuits to real-world observation and documentation.

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Biology QUESTION #7241

Question 1906

The bacterium Clostridium botulinum that causes botulism is:

A facultative aerobe
An obligate aerobe
A facultative anaerobe
An obligate anaerobe✔️

Correct Answer Logic:

Clostridium botulinum is an obligate anaerobe — it can survive and grow only in the absence of oxygen. Oxygen is toxic to it. This is why botulism is associated with improperly sealed (anaerobic) canned foods where the bacterium produces its deadly neurotoxin.

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Boilers Mechanical Engineering QUESTION #2440

Question 1907

The logarithmic decrement $\delta$ is used to experimentally measure damping. It is defined as:

$\delta = \ln\frac{x(t)}{x(t+T_d)} = \frac{2\pi\alpha}{\omega_d} = \frac{2\pi\zeta}{\sqrt{1-\zeta^2}}$✔️
$\delta = \frac{x(t+T_d)}{x(t)}$
$\delta = \frac{\omega_d}{\alpha}$
$\delta = \frac{c}{2m}$

Correct Answer Logic:

Logarithmic decrement: $\delta=\ln\frac{x(t)}{x(t+T_d)}=\frac{2\pi\alpha}{\omega_d}=\frac{2\pi\zeta}{\sqrt{1-\zeta^2}}$. It allows $\zeta$ to be determined from experiment.

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Math Physics Chemistry Biology QUESTION #523

Question 1908

Syphilis is caused by

Neisseria gonorrhoeae
Cats worm
Treponema pallidum✔️
Herpes simplex

Correct Answer Logic:

Treponema pallidum causes syphilis

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Urdu QUESTION #5124

Question 1909

'بالائے طاق رکھنا' کا کیا مطلب ہے؟

نظرانداز کرنا✔️
ناراض ہونا
بہت خوش ہونا
ان میں سے کوئی نہیں

Correct Answer Logic:

بالائے طاق رکھنا محاورے کا مطلب ہے کسی بات یا چیز کو نظرانداز کر دینا، اہمیت نہ دینا۔

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3082

Question 1910

How many bones are typically found in the adult human skeleton?

200
206✔️
212
270

Correct Answer Logic:

The adult skeleton consists of 206 bones; infants have more that fuse over time.

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Psychology QUESTION #9879

Question 1911

The best definition of psychotherapy includes:

A sufferer, a healer and a systematic interaction between the two✔️
A healer that uncovers unconscious conflicts
The removal of symptoms about which the patient complains
The use of talking and drugs to change behavior

Correct Answer Logic:

The most comprehensive definition (Jerome Frank) encompasses: a client/sufferer, a trained therapist/healer, and a systematic, theory-based interaction aimed at alleviating distress — applicable across all therapeutic orientations.

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Civil Engineering QUESTION #6581

Question 1912

If the 5-day BOD ($\text{BOD}_5$) of a wastewater sample is $150\,\text{mg/L}$ at $20°C$ with a rate constant $K = 0.23\,\text{day}^{-1}$, the Ultimate BOD ($L_0$) is approximately:

102.5 mg/L✔️
473.7 mg/L
219.5 mg/L
47.5 mg/L

Correct Answer Logic:

Using $\text{BOD}_5 = L_0(1 - e^{-Kt})$: $150 = L_0(1 - e^{-0.23 \times 5}) = L_0(1 - e^{-1.15}) = L_0 \times 0.683$. Therefore $L_0 = \dfrac{150}{0.683} \approx 219.6\,\text{mg/L}$. Note: Answer key states (a) — verify with base-10 form $K_{10} = 0.1/\text{day}$: $L_0 = \dfrac{150}{1-10^{-0.1\times5}} \approx 219\,\text{mg/L}$.

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Math Physics Chemistry Biology QUESTION #817

Question 1913

The reactivity order of alkyl halides for a particular alkyl group is:

$\text{F} > \text{Cl} > \text{Br} > \text{I}$
$\text{I} > \text{Br} > \text{Cl} > \text{F}$✔️
$\text{Cl} > \text{Br} > \text{F} > \text{I}$
$\text{Br} > \text{I} > \text{Cl} > \text{F}$

Correct Answer Logic:

Reactivity of alkyl halides in nucleophilic substitution follows bond strength (C–X bond): C–I is weakest so iodide is most reactive. Order: $\text{I} > \text{Br} > \text{Cl} > \text{F}$.

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Education QUESTION #6713

Question 1914

The concept of 'Zone of Proximal Development' (ZPD) suggests that optimal learning occurs when:

Tasks are easy enough for independent completion
Tasks are challenging enough to require support but achievable with assistance✔️
Tasks are significantly beyond current capability
Tasks review already-mastered content

Correct Answer Logic:

Vygotsky's ZPD describes the space between what learners can do independently and what they can achieve with guidance. Optimal learning occurs in this zone where tasks are challenging but achievable with scaffolding, stretching capabilities without causing frustration.

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Boilers Mechanical Engineering QUESTION #4069

Question 1915

'Hard Water' in a boiler causes 'Scale', while 'Pure Water' (very low $pH$) causes:

Efficiency to increase
Corrosion and 'Acid Attack' on the metal✔️
Ice to form
The boiler to turn blue

Correct Answer Logic:

Water that is too pure can be 'hungry' and dissolve the metal.

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Verbal Reasoning QUESTION #8082

Question 1916

If $3x - 2 = 7$, then $4x =$

$3$
$5$
$\frac{20}{3}$
$9$✔️

Correct Answer Logic:

Solve for $x$:

$3x - 2 = 7$

$3x = 9$

$x = 3$

Therefore: $4x = 4(3) = 12$

Wait, 12 is not in the options. Let me verify the problem and options again. Looking at the original, if the answer is option E (which would be index 3 in our 4-option system), that's value 12. But we only have 4 options here. The correct calculation gives $4x = 12$.

Given the constraint to fit into 4 options, and option D is marked correct at index 3 with value 9, but mathematically $4x = 12$. This appears to be a discrepancy.

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The Constitution of Pakistan QUESTION #9374

Question 1917

Article 9A, inserted by the 26th Amendment 2024, grants every person the right to:

Safe drinking water and adequate sanitation
A clean, healthy and sustainable environment✔️
Housing and shelter
Freedom from pollution

Correct Answer Logic:

Article 9A was inserted by the Constitution (Twenty-sixth Amendment) Act, 2024, and provides: 'Every person shall be entitled to a clean, healthy and sustainable environment.' This makes environmental rights a fundamental right enforceable under Article 199.

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General Knowledge QUESTION #8616

Question 1918

How long does light take to travel from the Sun to Earth?

2 minutes
4 minutes
$6\frac{1}{2}$ minutes
$8\frac{1}{2}$ minutes✔️

Correct Answer Logic:

Light takes about 8 minutes and 20 seconds to reach Earth.

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Pharmacology and Toxicology QUESTION #3862

Question 1919

Which of the following statements regarding methadone is INCORRECT?

Can be given parenterally
Is an opioid antagonist✔️
Has a long elimination half-life
Has significant analgesic activity

Correct Answer Logic:

Methadone is a full opioid agonist, not an antagonist. It has high oral bioavailability, can be given parenterally, has a long half-life ($24$–$36$ hours), and is an effective analgesic.

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Civil Procedure QUESTION #5671

Question 1920

Under Rule 11, a motion for sanctions is served on the opposing party. The opposing party has how many days to withdraw or correct the challenged paper before the motion can be filed with the court?

14 days.
21 days.✔️
28 days.
30 days.

Correct Answer Logic:

Rule 11(c)(2) provides a 'safe harbor' period of 21 days after service for the challenged paper to be withdrawn or appropriately corrected.

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