Reading Mode - Questions

Chemistry QUESTION #1074

Assertion (A): Alkyl iodide (R–I) undergoes S$_N$2 reaction faster than alkyl chloride (R–Cl). Reason (R): Iodine is a better leaving group because of its large size.

A is true but R is false
A is false but R is true
Both A and R are true and R is the correct explanation of A✔️
Both A and R are true but R is not the correct explanation of A

Correct Answer Logic:

Both A and R are true. R–I reacts faster in S$_N$2 than R–Cl because I$^-$ is a much better leaving group — it is larger, more polarizable, and the C–I bond is weaker. The large size of iodine means the C–I bond is longer and weaker, making it easier to break. R correctly explains A.

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Math Physics Chemistry Biology QUESTION #7739

Question 3622

Which disease is primarily transmitted through sexual contact?

Gonorrhoea✔️
Influenza
Tuberculosis
Typhoid

Correct Answer Logic:

Gonorrhoea (caused by Neisseria gonorrhoeae) is a sexually transmitted infection (STI). Influenza (respiratory), TB (airborne), typhoid (fecal-oral) are not typically STIs.

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Boilers Mechanical Engineering QUESTION #2433

Question 3623

For internal forced convection in a fully developed turbulent pipe flow (Dittus-Boelter equation), the Nusselt number is:

$Nu_D = 0.332 Re_D^{0.8} Pr^{0.4}$
$Nu_D = 0.023 Re_D^{0.8} Pr^n$ where $n=0.4$ for heating and $n=0.3$ for cooling✔️
$Nu_D = 3.66$ (constant, for laminar flow)
$Nu_D = 0.664 Re_D^{1/2} Pr^{1/3}$

Correct Answer Logic:

The Dittus-Boelter equation for turbulent pipe flow: $Nu_D=0.023Re_D^{0.8}Pr^n$ with $n=0.4$ for heating and $n=0.3$ for cooling.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3170

Question 3624

Which molecule is the main 'Energy Currency' of the cell?

Glucose
DNA
ATP✔️
RNA

Correct Answer Logic:

Adenosine Triphosphate (ATP) stores and releases energy for cellular work.

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Chemistry QUESTION #5521

Question 3625

The approximate pH of natural rainwater (unaffected by pollution) is:

5.6✔️
7.5
7
6.5

Correct Answer Logic:

Normal rainwater is slightly acidic due to dissolved $CO_2$ forming carbonic acid: $CO_2 + H_2O \rightarrow H_2CO_3$. This gives rain a pH of approximately 5.6. Acid rain (caused by $SO_x$ and $NO_x$) has a much lower pH, but natural rain pH is ~5.6.

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Reading and Writing (Module-1) QUESTION #5321

Question 3626

While many people believe that the primary function of a museum is to preserve artifacts, some curators argue that the ______ of those objects is equally important, as it allows the public to engage with history. Which choice completes the text with the most logical and precise word?

accessibility✔️
storage
origin
cost

Correct Answer Logic:

Engaging the public requires that objects be 'accessible,' making 'accessibility' the correct choice.

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Home Economics QUESTION #6261

Question 3627

Which vitamin is known as the 'Sunshine Vitamin' and is essential for calcium absorption?

Vitamin A
Vitamin C
Vitamin D✔️
Vitamin K

Correct Answer Logic:

Vitamin D is synthesized by the body when skin is exposed to sunlight and is crucial for bone health.

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General Knowledge QUESTION #8928

Question 3628

In which year did the French Revolution begin?

1775
1780
1785
1789✔️

Correct Answer Logic:

The French Revolution started in 1789.

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Urdu QUESTION #5212

Question 3629

جوئے شیر لانا محاورے کے معانی ہیں؟

بچپن کا زمانہ یاد کرنا
آسان کام کرنا
مشکل کام سر انجام دینا✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

جوئے شیر لانا محاورے کا مطلب ہے انتہائی مشکل کام کرنا۔ یہ فرہاد کی کہانی سے ماخوذ ہے۔

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Math Physics Chemistry Biology QUESTION #7741

Question 3630

What surrounds the muscle fibre (muscle cell) in skeletal muscle?

Cytoplasm
Lacunae
Myofibrils
Sarcoplasm✔️

Correct Answer Logic:

The cytoplasm of a muscle cell is called sarcoplasm. It contains myofibrils, organelles, and glycogen stores. Lacunae are in bone/cartilage.

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Geography QUESTION #6299

Question 3631

In the theory of sea-floor spreading, the age of oceanic crust:

Increases systematically from mid-ocean ridges to continental margins
Shows random distribution unrelated to ridge distance
Is oldest at mid-ocean ridges where new crust forms
Remains constant across ocean basins

Which statement is correct?

Statement 1 is correct✔️
Statement 2 is correct
Statement 3 is correct
Statement 4 is correct

Correct Answer Logic:

Sea-floor spreading at mid-ocean ridges creates new oceanic crust that moves away from the ridge. Therefore, crust age increases systematically with distance from the ridge axis - youngest at ridges (~0 Ma) and oldest near subduction zones (~200 Ma).

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Math Physics Chemistry Biology QUESTION #733

Question 3632

1 Cal = ___ J

418
400
10
4.18✔️

Correct Answer Logic:

1 calorie (small cal) = 4.18 Joules. 1 kcal = 4180 J ≈ 418 J but the standard value for 1 cal is 4.18 J.

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Nursing QUESTION #9143

Question 3633

A woman is in active labor. Partograph shows: the descent curve of fetal head has crossed the ALERT line. Contractions are 3 in 10 minutes, each lasting 35 seconds. What is the nurse's PRIORITY action?

Rupture membranes artificially (ARM) to accelerate labor
Administer oxytocin augmentation immediately
Reassess within 1 hour as crossing alert line alone is not an emergency
Inform the medical officer and prepare for transfer if in peripheral setting✔️

Correct Answer Logic:

The Partograph is a WHO tool for monitoring labor progress:

Cervicograph lines:

Alert line: Progress expected at $1\,\text{cm/hr}$ from active phase (4 cm). Crossing it = slow progress, increase vigilance.
Action line: 4 hours to the right of alert line. Crossing it = immediate obstetric action required.

Contractions: 3 in 10 minutes × 35 seconds = mild to moderate — not hyperstimulation (normal: 3–5 in 10 min, 40–60 sec)

When the alert line is crossed (not action line):

The situation requires reassessment and increased monitoring
In peripheral/basic EmOC settings: prepare for referral/transfer to a higher facility
In hospital: alert senior midwife/doctor, assess for cause of slow progress
Do NOT augment with oxytocin without medical assessment first
Crossing action line = immediate medical intervention needed

This question tests the distinction between alert line (warn and prepare) vs action line (act immediately).

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General Ability and Fire Fighting QUESTION #5597

Question 3634

Class D fires involve which type of fuel?

Cooking fats and oils
Flammable liquids
Combustible metals✔️
Ordinary combustibles

Correct Answer Logic:

Class D fires involve combustible metals such as magnesium and potassium. They require specialized dry powder extinguishing agents.

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Accounting & Finance QUESTION #9620

Question 3635

A provision for bad debts is maintained at 5% of year-end debtors. On July 1 the opening provision balance is Rs. 3,400. During the year, bad debts written off total Rs. 5,000. At June 30 the debtors' closing balance (after write-offs) is Rs. 75,000. What is the net charge/credit to the Profit & Loss Account in respect of bad debts and the provision for the year?

Charge Rs. 5,350 (bad debts Rs. 5,000 + provision increase Rs. 350)✔️
Charge Rs. 5,000 (bad debts only; provision decreases)
Credit Rs. 2,650 (net provision release)
Charge Rs. 8,750 (bad debts Rs. 5,000 + new provision Rs. 3,750)

Correct Answer Logic:

Required closing provision = 75,000 × 5% = Rs. 3,750. Opening provision = Rs. 3,400. Since the provision must increase, additional provision charged to P&L = 3,750 – 3,400 = Rs. 350. Bad debts of Rs. 5,000 are also charged to P&L. Total P&L charge = Rs. 5,000 + Rs. 350 = Rs. 5,350.

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Quantitative Reasoning QUESTION #8042

Question 3636

FREQUENCY: Choose the word most nearly opposite in meaning to this word.

unity
rarity✔️
gradualness
persistency

Correct Answer Logic:

FREQUENCY means how often something occurs — high rate of occurrence. Its direct antonym is rarity, which means occurring very seldom or infrequently. 'Unity' means oneness. 'Gradualness' means step-by-step pace. 'Persistency' means continuing steadily. Only 'rarity' directly opposes the idea of frequent occurrence.

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Civil Procedure QUESTION #3718

Question 3637

A tenant signs a lease that says 'No Pets.' The landlord sees the tenant has a cat and says, 'That's a nice cat, don't worry about the rule.' Six months later, the landlord tries to evict the tenant for having the cat. Which doctrine protects the tenant?

The Parol Evidence Rule.
Waiver or Promissory Estoppel.✔️
Unconscionability.
The Statute of Frauds.

Correct Answer Logic:

By stating the tenant shouldn't worry about the rule and allowing the cat for six months, the landlord has likely waived the right to enforce the 'no pets' clause, or the tenant has a claim under promissory estoppel for relying on the landlord's statement.

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