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Chemistry QUESTION #7134

An ideal gas undergoes an isothermal expansion from $1\text{ dm}^3$ to $10\text{ dm}^3$ at $300\text{ K}$ against a constant external pressure of $1\text{ bar}$. Determine the change in entropy of the surroundings ($\Delta S_{surr}$) in $\text{J K}^{-1}$.

$3.0$
$-3.0$✔️
$2.5$
$-2.5$

Correct Answer Logic:

In an irreversible expansion against constant external pressure, the work done by the gas is $w = -P_{ext}\Delta V = -1 \text{ bar} \times (10 - 1) \text{ dm}^3 = -900\text{ J}$. For an isothermal process of an ideal gas, $\Delta U = 0$, so $q_{sys} = -w = 900\text{ J}$. The heat gained by the surroundings is $q_{surr} = -q_{sys} = -900\text{ J}$. Thus, $\Delta S_{surr} = \frac{q_{surr}}{T} = \frac{-900}{300} = -3.0\text{ J K}^{-1}$.

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Social Studies QUESTION #10016

Question 5462

As per the WEF Global Gender Gap Report 2023, where was Pakistan ranked among 146 countries?

145
142✔️
140
None of these

Correct Answer Logic:

Pakistan was ranked 142nd out of 146 countries in the 2023 report.

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The Elections Act 2017 QUESTION #9459

Question 5463

Under Section 142(1), an election petition must be presented to the Election Tribunal within how many days of publication of the returned candidate's name in the official Gazette?

Thirty days
Sixty days
Forty-five days✔️
Twenty-one days

Correct Answer Logic:

Section 142(1) states: 'An election petition shall be presented to the Election Tribunal within forty-five days of the publication in the official Gazette of the name of the returned candidate.'

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Accounting & Finance QUESTION #6125

Question 5464

Sales $800,000; Variable costs $480,000; Fixed costs $280,000. What sales revenue is required for a profit of $200,000?

$520,000
$960,000
$1,000,000✔️
$1,200,000

Correct Answer Logic:

Option C ($1,000,000) is correct.

CS ratio = ($800,000 − $480,000) ÷ $800,000 = 40%

Required sales = (Fixed costs + Target profit) ÷ CS ratio = ($280,000 + $200,000) ÷ 0.40 = $1,000,000

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Home Economics QUESTION #6244

Question 5465

Which style of parenting is characterized by high demands but low responsiveness?

Authoritative
Permissive
Uninvolved
Authoritarian✔️

Correct Answer Logic:

Authoritarian parents establish strict rules with little room for open dialogue or emotional support.

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Medicinal Chemistry and Biopharmaceutics QUESTION #3815

Question 5466

Which quality control test listed below is NOT considered an official pharmacopoeial test for solid oral dosage forms such as tablets?

Dissolution
Hardness✔️
Disintegration
Friability

Correct Answer Logic:

Hardness is a manufacturing quality check but is not an official pharmacopoeial test. Dissolution, disintegration, and friability are official.

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Physics QUESTION #7343

Question 5467

A projectile is launched from the ground with initial velocity $\vec{u} = u_0\hat{i} + v_0\hat{j}$. Gravity acts in the $-y$ direction. The maximum displacement in the $x$-direction is:

$\dfrac{u_0^2}{2g}$
$\dfrac{2u_0 v_0}{g}$✔️
$\dfrac{v_0^2}{2g}$
$\dfrac{4u_0 v_0}{g}$

Correct Answer Logic:

Time of flight $= \dfrac{2v_0}{g}$ (time for vertical displacement to return to zero).

Horizontal range $= u_0 \times \dfrac{2v_0}{g} = \mathbf{\dfrac{2u_0 v_0}{g}}$

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Maths QUESTION #4522

Question 5468

Simplify: $4^2 \times 2^2$

$8^4$
$(8 \times 2)^2$
$8^2$✔️
$2^8$

Correct Answer Logic:

$4^2 \times 2^2 = (4 \times 2)^2 = 8^2 = 64$. Using $(bc)^m = b^m c^m$

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Accounting & Finance QUESTION #6176

Question 5469

If you invest $1,000 today at a 10% interest rate with 'Continuous Compounding', what is the formula to find the value after 5 years?

$1,000 \times (1.10)^5$
$1,000 \times e^{0.10 \times 5}$✔️
$1,000 \times (1 + 0.10/12)^{60}$
$1,000 + (1,000 \times 0.10 \times 5)$

Correct Answer Logic:

Lesson 04 specifies that for continuous compounding, $FV = PV \times e^{i \times n}$.

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Physics QUESTION #7088

Question 5470

A wire has length $l_1$ at tension $T_1$ and $l_2$ at tension $T_2$. Find its original length.

$\frac{T_1 l_1 - T_2 l_2}{T_2 - T_1}$
$\frac{l_1 + l_2}{2}$
$\frac{T_2 l_1 + T_1 l_2}{T_2 + T_1}$
$\frac{T_2 l_1 - T_1 l_2}{T_2 - T_1}$✔️

Correct Answer Logic:

Using Hooke's Law: $l = L + \frac{TL}{AY} \implies l = L + kT$ where $k = \frac{L}{AY}$.

$l_1 = L + kT_1$ and $l_2 = L + kT_2$
Subtracting: $l_2 - l_1 = k(T_2 - T_1) \implies k = \frac{l_2 - l_1}{T_2 - T_1}$
Substitute $k$ back: $L = l_1 - T_1(\frac{l_2 - l_1}{T_2 - T_1}) = \frac{T_2 l_1 - T_1 l_2}{T_2 - T_1}$.

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English QUESTION #2724

Question 5471

Identify the CONJUNCTION in the sentence: 'I wanted to go

but it was raining.'?✔️
wanted
go
but

Correct Answer Logic:

2

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General Science and Ability QUESTION #194

Question 5472

All operating systems get their total memory initialized from:

BIOS✔️
RAM
ROM
CPU

Correct Answer Logic:

The BIOS (Basic Input/Output System) initializes hardware and memory during boot-up.

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

Question 5473

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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Planning QUESTION #4968

Question 5474

In land economics, what determines land value most significantly?

Land size only
Location and accessibility✔️
Soil quality
Historical ownership

Correct Answer Logic:

Land value is primarily determined by location and accessibility to jobs, services, and amenities, as captured by the principle 'location, location, location' in real estate.

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General Knowledge QUESTION #11545

Question 5475

The Central Processing Unit (CPU) consists of the Control Unit, Memory Unit, and:

Microprocessor Unit
Arithmetic / Logic Unit (ALU)✔️
Output Unit
ROM Unit

Correct Answer Logic:

The CPU comprises three main units: (1) Control Unit (CU) — fetches and decodes instructions; (2) Arithmetic/Logic Unit (ALU) — performs arithmetic (add, subtract, multiply, divide) and logical (AND, OR, NOT) operations; and (3) Registers — temporary fast storage. Memory (RAM) is separate from the CPU.

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Mathematics QUESTION #6986

Question 5476

Five observations have mean $= 4$ and variance $= 5.2$. Three of the observations are $3, 4, 4$. Find the absolute difference between the remaining two observations.

7✔️
5
1
3

Correct Answer Logic:

Step 1 — Find the sum: $\sum x_i = 5\times4=20$. Known three: $3+4+4=11$. So $x_4+x_5=9$.

Step 2 — Find sum of squares: Variance $=\frac{\sum x_i^2}{n}-\bar{x}^2 \Rightarrow \frac{\sum x_i^2}{5}-16=5.2 \Rightarrow \sum x_i^2=106$.

Known: $3^2+4^2+4^2=9+16+16=41$. So $x_4^2+x_5^2=65$.

Step 3 — Solve: $x_4+x_5=9$ and $x_4^2+x_5^2=65$.

$(x_4+x_5)^2=81 \Rightarrow 2x_4x_5=81-65=16 \Rightarrow x_4x_5=8$.

$(x_4-x_5)^2=(x_4+x_5)^2-4x_4x_5=81-32=49$

$|x_4-x_5|=\mathbf{7}$

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Dairy Food Science and Technology QUESTION #5873

Question 5477

Which best explains why homogenized milk does not form a cream layer?

Fat globules are chemically altered
Fat globule size is reduced below $2\;\mu\text{m}$ preventing creaming by Stokes' law✔️
Density of fat is increased to match skim milk
Casein micelles coat fat globules preventing coalescence

Correct Answer Logic:

Homogenization reduces fat globule diameter to below $2\;\mu\text{m}$. By Stokes' law, creaming velocity $v \propto r^2$; smaller globules rise negligibly slowly, preventing cream layer formation.

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Education QUESTION #6706

Question 5478

When implementing cooperative learning, a teacher notices one student dominates while others remain passive. What is the PRIMARY cooperative learning principle being violated?

Positive interdependence
Individual accountability✔️
Equal participation structures
Group processing

Correct Answer Logic:

Individual accountability ensures each member is responsible for learning and contributing. Without structured accountability mechanisms (individual assessments, assigned roles, random selection for reporting), group work can become dominated by one member while others disengage.

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Chemistry QUESTION #435

Question 5479

Name the rare halogen among the following.

F
Cl
I
At✔️

Correct Answer Logic:

Astatine (At) is the rarest halogen

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Nursing QUESTION #9230

Question 5480

A Head Nurse is interpreting a 12-lead ECG of an ICU patient who reports crushing chest pain. She identifies ST elevation $\geq 2 \text{ mm}$ in leads V1–V4. What is the MOST likely diagnosis and the target time for intervention?

Inferior STEMI — PCI within 90 minutes
Anterior STEMI — PCI within 90 minutes (door-to-balloon time)✔️
NSTEMI — medical management for 72 hours before PCI
Pericarditis — ST elevation in all leads, treat with NSAIDs

Correct Answer Logic:

Correct Answer: B — Anterior STEMI, PCI within 90 minutes

ECG Lead Localization of MI:

Leads with ST Elevation	Location	Artery
V1–V4	Anterior	Left Anterior Descending (LAD)
II, III, aVF	Inferior	Right Coronary Artery (RCA)
I, aVL, V5–V6	Lateral	Left Circumflex (LCx)
V1–V2 (tall R waves)	Posterior	RCA or LCx

Time targets (AHA/ACC Guidelines):

Door-to-ECG: $\leq 10$ minutes
Door-to-balloon (PCI): $\leq 90$ minutes
Door-to-needle (thrombolysis): $\leq 30$ minutes (if PCI unavailable)

Anterior STEMI is the most dangerous — large area of myocardium supplied by LAD. The Charge Nurse must activate the cath lab immediately.

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