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Chemistry QUESTION #7528

Two liquids A and B form an ideal solution. At 350 K, the vapour pressures of pure A and pure B are $7\times10^3$ Pa and $12\times10^3$ Pa respectively. For a solution with 40 mol% A, what is the composition of the vapour in equilibrium?

$x_A=0.37;\ x_B=0.63$
$x_A=0.28;\ x_B=0.72$✔️
$x_A=0.4;\ x_B=0.6$
$x_A=0.76;\ x_B=0.24$

Correct Answer Logic:

Mole fraction in liquid: $x_A = 0.40,\ x_B = 0.60$

By Raoult's Law:

$P_A = x_A \cdot P_A^0 = 0.40 \times 7000 = 2800\ \text{Pa}$

$P_B = x_B \cdot P_B^0 = 0.60 \times 12000 = 7200\ \text{Pa}$

$P_{\text{total}} = 2800 + 7200 = 10000\ \text{Pa}$

In vapour phase: $y_A = \dfrac{P_A}{P_{\text{total}}} = \dfrac{2800}{10000} = \mathbf{0.28}$

$y_B = 1 - 0.28 = \mathbf{0.72}$

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Education QUESTION #7594

Question 10602

The method of descriptive research that seeks to describe behavior under natural conditions without manipulation is called:

Interview
Observation✔️
In-depth interview
None of these

Correct Answer Logic:

Observation as a research method involves systematically watching and recording behavior in natural settings without artificially manipulating conditions.

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English QUESTION #8490

Question 10603

Select the word SIMILAR in meaning to: Imperious

proud✔️
temper
tamper
distant

Correct Answer Logic:

Imperious means arrogant or domineering; proud is closest.

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General Knowledge QUESTION #11543

Question 10604

Which category describes a medium-sized multi-user computer system?

Microcomputer
Mainframe
Supercomputer
Minicomputer✔️

Correct Answer Logic:

A Minicomputer (minicomputer) is a medium-sized computer, smaller than a mainframe but larger and more powerful than a microcomputer (PC). Minicomputers emerged in the 1960s (e.g. DEC PDP series), supported multiple simultaneous users, and were used in scientific research and business. They were superseded by powerful workstations and servers.

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Physics and Math QUESTION #782

Question 10605

$\dfrac{1 - \cos\alpha}{\sin\alpha} = ?$

$\tan\dfrac{\alpha}{2}$✔️
$\cot\dfrac{\alpha}{2}$
$\sin\dfrac{\alpha}{2}$
None

Correct Answer Logic:

Using half-angle identities: $1 - \cos\alpha = 2\sin^2\dfrac{\alpha}{2}$ and $\sin\alpha = 2\sin\dfrac{\alpha}{2}\cos\dfrac{\alpha}{2}$, so the ratio $= \tan\dfrac{\alpha}{2}$.

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Chemistry QUESTION #7183

Question 10606

How much water (in litres) must be added to $1 \text{ L}$ of an aqueous $HCl$ solution with a $pH$ of $1$ to result in a final solution with a $pH$ of $2$?

$0.1 \text{ L}$
$0.9 \text{ L}$
$2.0 \text{ L}$
$9.0 \text{ L}$✔️

Correct Answer Logic:

Using the definition of $pH = -\log[H^{+}]$:

Initial $[H^{+}] = 10^{-1} = 0.1 \text{ M}$.
Final $[H^{+}] = 10^{-2} = 0.01 \text{ M}$.
Using dilution formula $M_{1}V_{1} = M_{2}V_{2}$:
$0.1 \times 1 = 0.01 \times V_{2} \implies V_{2} = 10 \text{ L}$.
Volume to be added = $V_{2} - V_{1} = 10 - 1 = 9 \text{ L}$.

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MBBS QUESTION #10306

Question 10607

A breastfed neonate develops vomiting, jaundice, hepatomegaly, and reducing substances in the urine shortly after birth. This presentation, classic for severe (classic) galactosemia, most commonly results from deficiency of:

Galactokinase
Galactose-1-phosphate uridyltransferase (GALT)✔️
UDP-glucose 4-epimerase
Lactase

Correct Answer Logic:

GALT deficiency causes classic galactosemia, with toxic accumulation of galactose-1-phosphate causing liver, kidney, and brain damage if untreated; galactokinase deficiency instead causes a much milder form limited mainly to cataract formation, without the severe hepatic and systemic toxicity.

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Accounting & Finance QUESTION #9665

Question 10608

In accounting for Non-Profit Organizations, the Accumulated Fund (Capital Fund) is computed as:

Total subscriptions collected during the year
Total income minus total expenditure for the year
Assets minus Liabilities as on the opening date via Statement of Affairs✔️
Donations plus grants received during the year

Correct Answer Logic:

The opening balance of Capital Fund is computed through the Statement of Affairs on the opening date: Capital Fund = Total Assets – Total Liabilities. This mirrors the owner's equity calculation in business entities. Subsequent surpluses/deficits and capital receipts are then adjusted to arrive at the closing balance.

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HR and Management QUESTION #6439

Question 10609

In the context of managing diversity, organizations strive for workplace balance primarily as a matter of:

Legal compliance and avoiding lawsuits
Economic self-interest and improved performance✔️
Social justice and moral obligation
Government mandate enforcement

Correct Answer Logic:

While legal and moral factors exist, the text emphasizes that managers are striving for racial, ethnic, and sexual workplace balance as a matter of economic self-interest. Studies show cultural diversity contributes to improved productivity, return on equity, and market performance.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3106

Question 10610

Which vein is commonly used for venipuncture (drawing blood) in the arm?

Saphenous vein
Median cubital vein✔️
Jugular vein
Femoral vein

Correct Answer Logic:

The median cubital vein in the antecubital fossa is the most common site for blood draws.

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Civil Engineering QUESTION #6575

Question 10611

The specific energy in open channel flow is given by:

\$ E = y - \\dfrac{\\alpha V^2}{2g} \$
\$ E = y - \\dfrac{V^2}{2g\\alpha} \$
\$ E = y + \\dfrac{V^2}{2g\\alpha} \$
\$ E = y + \\dfrac{\\alpha V^2}{2g} \$✔️

Correct Answer Logic:

Specific energy is defined as energy per unit weight measured relative to the channel bed: $E = y + \dfrac{\alpha V^2}{2g}$, where $y$ = flow depth, $V$ = mean velocity, $\alpha$ = kinetic energy correction factor, $g$ = gravitational acceleration.

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Math Physics Chemistry Biology QUESTION #4222

Question 10612

The induced fit model differs from the Lock and Key model because the enzyme in this model:

Has a rigid and fixed active site
Changes shape to fit the substrate✔️
Is non-specific in its action
Is denatured during reaction

Correct Answer Logic:

Induced fit model: enzyme changes shape upon substrate binding.

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Ability / HR / Governance / Special Education QUESTION #1905

Question 10613

Under which Articles of the Constitution of Pakistan were the Rules of Business 1973 framed?

Articles 80 and 99
Articles 90 and 99✔️
Articles 90 and 100
Articles 80 and 100

Correct Answer Logic:

Rule 1 and the preamble clearly state that the Rules of Business 1973 were made in exercise of powers conferred by Articles 90 and 99 of the Constitution of the Islamic Republic of Pakistan.

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Civil Engineering QUESTION #6590

Question 10614

A continuous beam covering two spans is to be analysed using the stiffness matrix method, with two nodes assigned per element. The order of the resulting structural stiffness matrix will be:

2×2
4×4
6×6✔️
12×12

Correct Answer Logic:

With 2 spans (2 elements) and 2 nodes per element, there are 3 unique nodes. Each beam node has 2 DOFs (vertical displacement and rotation), giving $3 \times 2 = 6$ DOFs. Structural stiffness matrix order $= 6 \times 6$.

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Chemistry QUESTION #477

Question 10615

The electron present in a particular orbit __________ energy.

Releases
Does not radiate✔️
Absorbs
None of these

Correct Answer Logic:

Electron in stationary orbit does not radiate energy

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Math Physics Chemistry Biology QUESTION #11267

Question 10616

Which neurotransmitter is primarily deficient in patients with Parkinson's disease?

Acetylcholine
Dopamine✔️
Serotonin
GABA

Correct Answer Logic:

Parkinson's disease is characterized by the degeneration of dopaminergic neurons in the substantia nigra of the midbrain. This leads to dopamine deficiency, causing tremors, rigidity, bradykinesia, and postural instability.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3224

Question 10617

The 'Hypothalamus' acts as the body's thermostat. To COOL the body, it triggers:

Vasoconstriction
Shivering
Vasodilation and Sweating✔️
Increased metabolic rate

Correct Answer Logic:

Dilation of skin vessels and evaporation of sweat dissipate heat.

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Mathematics QUESTION #4121

Question 10618

By Mean Value Theorem on $f(x) = e^x$, for $x > 0$, there exists $c \in (0, x)$ such that:

$e^x - 1 = e^c \cdot x$✔️
$e^x - 1 = x$
$e^x = 1 + cx$
$\frac{e^x - 1}{x} = c$

Correct Answer Logic:

MVT: $\frac{f(x) - f(0)}{x - 0} = f'(c) = e^c$. So $\frac{e^x - 1}{x} = e^c$, giving $e^x - 1 = xe^c$.

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General Knowledge QUESTION #8745

Question 10619

Which country's flag is said to never fly at half-mast?

Jordan
Syria
Iran
Saudi Arabia✔️

Correct Answer Logic:

The Saudi flag never flies at half-mast because it bears the Shahada.

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Education QUESTION #6767

Question 10620

A testing agency wants to determine whether a new aptitude test produces scores consistent with scores from an already-validated ability test administered simultaneously. Which reliability/validity method is being employed?

Test-retest reliability
Concurrent criterion validity✔️
Predictive criterion validity
Split-half reliability

Correct Answer Logic:

Concurrent validity is a form of criterion validity where two measures are administered at the same time (concurrently) and their scores are correlated. If the new test scores align with the validated test, this is evidence of concurrent validity. It is not reliability (which involves the same test repeated or split) nor predictive validity (which requires a future criterion).

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