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Chemistry QUESTION #5543

Which of the following diatomic molecules is expected to show diamagnetic behaviour according to Molecular Orbital Theory?

$C_2$
$N_2$✔️
$O_2$
$S_2$

Correct Answer Logic:

$N_2$ has the electronic configuration $(\sigma_{1s})^2(\sigma^*_{1s})^2(\sigma_{2s})^2(\sigma^*_{2s})^2(\pi_{2p})^4(\sigma_{2p})^2$ — all electrons are paired → diamagnetic. $O_2$ and $S_2$ have unpaired electrons in $\pi^*$ orbitals → paramagnetic. $C_2$ has all electrons paired in $\pi$ orbitals and is also diamagnetic. Both $C_2$ and $N_2$ are diamagnetic, but $N_2$ is the more standard textbook answer.

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Dairy Food Science and Technology QUESTION #5956

Question 8122

The 'cheddaring' process in cheddar cheese making refers to:

Adding cheddar-specific starter cultures
Piling the curd slabs and turning them repeatedly to expel whey through self-compression, allowing lactic acid fermentation to continue (pH drops from $\approx 6.1$ to $5.4$) and curd to mat and develop plasticity✔️
Pressing cheddar in hoops at high pressure for 24 hours
Waxing and coating the cheese wheels for ripening

Correct Answer Logic:

Cheddaring: after whey drainage, curd is cut into slabs stacked $2\text{–}4$ high and turned every $15$ minutes for $60\text{–}90$ minutes at $35\text{–}38^{\circ}\text{C}$. Acid development continues ($\text{pH}$ drops from $\approx 6.1$ to $5.4$) and the curd's own weight expels residual whey.

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MBBS QUESTION #10261

Question 8123

A patient with severe secretory diarrhea loses large amounts of bicarbonate-rich intestinal fluid and develops metabolic acidosis. Using $pH = 6.1 + \log_{10}\dfrac{[HCO_3^-]}{0.03 \times PaCO_2}$, which combination of changes is expected as the body compensates?

A primary fall in plasma bicarbonate, with compensatory hyperventilation lowering PaCO2 to partially normalize pH✔️
A primary rise in plasma bicarbonate with an unchanged PaCO2
A primary rise in PaCO2 with a normal bicarbonate level
No change in either bicarbonate or PaCO2, since diarrhea does not affect acid-base status

Correct Answer Logic:

Diarrhea causes direct loss of bicarbonate, producing a primary metabolic acidosis (low HCO3-). The resulting fall in pH stimulates chemoreceptor-driven hyperventilation, lowering PaCO2 as a rapid respiratory compensation that partially restores the HCO3-/PaCO2 ratio and pH toward normal, though full renal compensation takes longer.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3519

Question 8124

An 'Allergen' is a substance that:

Causes a disease
Triggers an allergic reaction (hypersensitivity)✔️
Cures a headache
Increases energy

Correct Answer Logic:

Allergens stimulate the immune system to react excessively.

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General Science and Ability QUESTION #195

Question 8125

The amount of data transmitted for a given amount of time is called:

Noise
Bandwidth✔️
Frequency
None of these

Correct Answer Logic:

Bandwidth is the capacity of a wired or wireless network communications link.

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Logical Reasoning QUESTION #3940

Question 8126

Select the pair with a similar relationship: BREAD : FLOUR

Candy : Sugar✔️
Tire : Rubber
Meat : Animal
Wine : Grapes

Correct Answer Logic:

3

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Chemistry QUESTION #7369

Question 8127

A particle moves at 3 times the speed of an electron. If the ratio of de Broglie wavelength of the particle to that of the electron is $1.8 \times 10^{-4}$, the particle is:

Neutron
$\alpha$-particle✔️
Deuteron
Tritium

Correct Answer Logic:

de Broglie wavelength: $\lambda = \dfrac{h}{mv}$

$\dfrac{\lambda_p}{\lambda_e} = \dfrac{m_e v_e}{m_p v_p} = \dfrac{m_e}{m_p \times 3} = 1.8 \times 10^{-4}$

$m_p = \dfrac{m_e}{3 \times 1.8 \times 10^{-4}} = \dfrac{9.1 \times 10^{-31}}{5.4 \times 10^{-4}} \approx 6.68 \times 10^{-27}$ kg

This is approximately 4 times the proton mass, matching the $\alpha$-particle (He nucleus, mass $\approx 4$ u).

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Accounting & Finance QUESTION #6139

Question 8128

A sales ledger control account included: (1) Contra with purchases ledger: $500 debit; (2) Discount allowed: $600 debit; (3) Irrecoverable debts written off: $1,200 debit. Which entries must be corrected?

1, 2 and 3✔️
1 and 2 only
1 and 3 only
2 and 3 only

Correct Answer Logic:

Option A (all three) is correct.

Contra entry should be a credit (reduces receivables), not debit.
Discount allowed should be a credit (reduces amount owed by customers), not debit.
Irrecoverable debts written off should be a credit (reduces receivable), not debit.

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Accounting & Finance QUESTION #6216

Question 8129

In the context of 'Audit Risk', if the Auditor assesses the 'Control Risk' ($CR$) as $1$ (100%), what is the logical implication for the audit strategy?

The auditor can reduce the amount of substantive testing
The auditor should rely on the internal control questionnaire
The auditor must adopt an extensive substantive approach✔️
The auditor should issue a modified report immediately

Correct Answer Logic:

If controls are weak ($CR$ is high), the auditor cannot rely on them and must perform extensive testing of transactions and balances (substantive approach).

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Paper-II (Pharmacology and Social Behaviour, Law & Ethics and Computer Sciences) QUESTION #5771

Question 8130

Schizophrenia is associated with overactivity of which pathway?

Cholinergic
GABAergic
Dopamine (mesolimbic/mesocortical)✔️
Adrenergic

Correct Answer Logic:

Schizophrenia is linked to excess dopamine activity in specific brain pathways.

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Nursing QUESTION #9287

Question 8131

The Rule of Nines is used in burn assessment. A patient has burns covering the entire right arm and anterior trunk. What percentage of TBSA (Total Body Surface Area) is burned?

27%
✔️
36%
18%
45%

Correct Answer Logic:

The Rule of Nines for adult burn assessment:

Body Region	TBSA %
Head and neck	9%
Each upper limb (arm)	9%
Anterior trunk	18%
Posterior trunk	18%
Each lower limb (leg)	18%
Perineum/genitalia	1%
Total	100%

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Chemistry QUESTION #5524

Question 8132

Match the following: Column I — (A) Allosteric effect, (B) Competitive inhibitor, (C) Receptor, (D) Poison; Column II — (P) Molecule binding to the active site, (Q) Molecule crucial for body communication, (R) Molecule binding to a site other than the active site, (S) Molecule binding covalently to the enzyme

$(A)\to(R);\ (B)\to(P);\ (C)\to(Q);\ (D)\to(S)$✔️
$(A)\to(P);\ (B)\to(R);\ (C)\to(Q);\ (D)\to(S)$
$(A)\to(R);\ (B)\to(P);\ (C)\to(S);\ (D)\to(Q)$
$(A)\to(P);\ (B)\to(R);\ (C)\to(S);\ (D)\to(Q)$

Correct Answer Logic:

Allosteric effect: A molecule binds to a site other than the active site, altering enzyme activity → (R). Competitive inhibitor: A molecule structurally similar to the substrate binds the active site → (P). Receptor: Molecules (like hormones/neurotransmitters) crucial for body communication bind receptors → (Q). Poison: Poisons like heavy metal ions bind enzymes covalently and permanently inactivate them → (S).

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General Knowledge QUESTION #11489

Question 8133

MS Word includes built-in graphical images that can be inserted into files, called:

Clip Art✔️
Hyperlinks
Captions
Bookmarks

Correct Answer Logic:

Clip art is the collection of pre-made illustrations and images included with Microsoft Office that can be inserted into documents. In older Word versions it was accessed via Insert → Picture → Clip Art. In Office 365/Word Online, it was replaced by online image search via Bing.

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Nursing QUESTION #9167

Question 8134

In nursing staff scheduling, the cyclic scheduling method refers to:

Scheduling based on seniority
A fixed, repeating pattern of work schedules✔️
Scheduling that changes every week
Random assignment of shifts

Correct Answer Logic:

Cyclic Scheduling in nursing management is a method where a fixed pattern of work schedules repeats in cycles (e.g., every 4, 6, or 8 weeks). Advantages include:

Fairness — all staff rotate equally through shifts
Predictability — staff can plan personal activities in advance
Reduced administrative burden for Head Nurse
Improved staff satisfaction and retention

As a Head Nurse, choosing the right scheduling method directly impacts nursing staff morale, workload distribution, and patient care quality.

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Agronomy QUESTION #2036

Question 8135

Physiological maturity in cereal crops is best identified by:

The date 30 days after heading
Formation of the black layer at the base of the grain (in maize) or when grain moisture reaches 30–35% and maximum dry weight is achieved✔️
When the entire crop canopy turns golden yellow
When combine harvester settings indicate optimum grain moisture

Correct Answer Logic:

Physiological maturity marks the cessation of dry matter accumulation in the grain. In maize it is identified by the black layer (abscission layer) at the kernel base. In wheat/rice, grain moisture of 30–35% at maximum dry weight is the indicator — harvesting before this causes yield loss; after causes field losses.

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Education QUESTION #11635

Question 8136

Systematic, progressive change in mental processes that supports all learning and performance across development is referred to as:

Moral development
Cognitive development✔️
Social-emotional development
None of these

Correct Answer Logic:

Cognitive development refers to the systematic growth and change in thinking, reasoning, memory, and problem-solving abilities across the lifespan. Jean Piaget is its most prominent theorist. It is distinct from moral development (values and ethical reasoning) and social-emotional development (interpersonal skills and emotional regulation).

Correct Answer: B — Cognitive development.

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Pakistan Affairs QUESTION #4669

Question 8137

Which district of Pakistan has the lowest population density?

Khuzdar
Kalat
Kharan✔️
Chagai

Correct Answer Logic:

Kharan district in Balochistan has one of the lowest population densities in Pakistan, given its vast desert terrain and sparse settlements.

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General Knowledge QUESTION #2624

Question 8138

THERMAL PASTE is used in a computer to:

Lubricate the moving parts inside a hard disk drive
Better connect the CPU and heat sink so heat transfers more efficiently between them✔️
Protect the motherboard from electrical surges and short circuits
Improve the connection speed between RAM and the CPU

Correct Answer Logic:

Thermal paste is a substance used to better connect our CPU and heat sink so that heat transfers from one to the other more efficiently. It fills microscopic gaps between the CPU surface and the heatsink base, improving thermal conductivity and cooling effectiveness.

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