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Civil / Architecture QUESTION #2364

In soil compaction, the Zero Air Voids (ZAV) curve or 100% saturation curve represents:

The maximum dry density achievable for a given soil at any compactive effort
The theoretical maximum dry density \(\gamma_{d,max}\) at a given water content \(w\) if all air voids are eliminated, given by \(\gamma_d = \dfrac{G_s \gamma_w}{1 + w G_s}\)✔️
The field density achieved by standard Proctor compaction test
The relationship between void ratio and effective stress during consolidation

Correct Answer Logic:

The ZAV curve is the theoretical upper bound of dry density at any moisture content, computed as \(\gamma_d = \dfrac{G_s \gamma_w}{1 + w G_s}\), assuming \(S = 100\%\) (all voids filled with water, no air). In practice, compaction curves plot below and to the left of the ZAV curve. The ZAV curve does not represent an achievable state during compaction but serves as a reference limit.

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Boilers Mechanical Engineering QUESTION #2447

Question 7662

The Duhamel integral gives the response of an undamped SDOF system to an arbitrary forcing function \(F(t)\) as:

\(x(t) = \frac{1}{m\omega_n}\int_0^t F(\tau)\sin[\omega_n(t-\tau)]\,d\tau\) plus homogeneous solution✔️
\(x(t) = \frac{1}{k}\int_0^t F(\tau)\,d\tau\)
\(x(t) = \int_0^t F(\tau)\cos[\omega_n(t-\tau)]\,d\tau\)
\(x(t) = F(t)/k\)

Correct Answer Logic:

The Duhamel (convolution) integral for an undamped SDOF system: \(x(t)=\frac{1}{m\omega_n}\int_0^t F(\tau)\sin[\omega_n(t-\tau)]d\tau\) plus the free-vibration homogeneous solution from initial conditions.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3568

Question 7663

Which drug is an 'Expectorant' (helps clear mucus)?

Senna
Vasaka (Adhatoda)✔️
Aloe
Castor oil

Correct Answer Logic:

Vasaka is a traditional remedy for bronchitis and cough.

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MCQs Section QUESTION #5182

Question 7664

وہ فعل جس میں موجود زمانے کے متعلق بتایا جائے اور آئندہ مستقبل کا ہونا معلوم ہو، کیا کہلاتا ہے؟

فعلِ ماضی
فعلِ مضارع✔️
فعلِ حال
فعلِ امر

Correct Answer Logic:

فعلِ مضارع وہ فعل ہے جس میں حال اور مستقبل دونوں کے معنی نکلتے ہوں۔

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Statistics QUESTION #1969

Question 7665

In the sampling distribution of a statistic, the total sum of all frequencies equals:

Sample size \((n)\)
Population size \((N)\)
Number of all possible samples✔️
Sum of all X values

Correct Answer Logic:

The frequency distribution of a sampling statistic lists all possible samples. The sum of frequencies equals the total number of possible samples that can be drawn from the population.

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Education QUESTION #7590

Question 7666

Which assessment focuses on measuring what students can actually do rather than simply recall facts?

Performance-based assessment✔️
Objective test
Oral test
Short-answer test

Correct Answer Logic:

Performance-based assessment requires students to demonstrate skills through actual tasks or activities, showing application rather than just factual recall.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3580

Question 7667

Which branch of Pharmacognosy deals with the history, commerce, selection, and preservation of crude drugs?

Ethnobotany
General Pharmacognosy✔️
Phytochemistry
Zoology

Correct Answer Logic:

General Pharmacognosy covers the broader aspects of crude drug management and history.

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Math Physics Chemistry Biology QUESTION #799

Question 7668

The maximum volume of \(\text{O}_2\) is at:

HTP
STP✔️
\(127°\text{C},\ 1\ \text{atm}\)
None

Correct Answer Logic:

At STP (Standard Temperature and Pressure: \(0°\text{C},\ 1\ \text{atm}\)), gases occupy maximum volume as temperature is lower, keeping more molecules in gaseous phase.

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Academic/Professional (Social Sciences) QUESTION #10100

Question 7669

A study following the same group of individuals over multiple time points is called a:

Cross-sectional study
Panel study✔️
Case study
Time-series study

Correct Answer Logic:

A panel study tracks the same subjects repeatedly over time.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3663

Question 7670

'Latex' is a milky fluid found in special cells called:

Vessels
Laticifers✔️
Tracheids
Parenchyma

Correct Answer Logic:

Opium and Rubber are obtained from latex.

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MCQs Section QUESTION #5040

Question 7671

وہ فعل جس میں گزرے ہوئے زمانے کا پتا چلے لیکن قریب یا دور کا فرق نہ ہو، کیا کہلاتا ہے؟

فعلِ ماضی
ماضی مطلق✔️
ماضی استمراری
ماضی شکیہ

Correct Answer Logic:

ماضی مطلق وہ فعل ہے جس میں کام گزرے ہوئے وقت میں ہوا ہو لیکن قریب یا بعید کا تعین نہ ہو۔

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MCQs Section QUESTION #4464

Question 7672

وہ جملہ جس میں ایک لفظ مثبت اور دوسرا منفی ہو تو اسے کیا کہتے ہیں۔ (What is a sentence called that contains both positive and negative words?)

صفت استعارہ
صفت تضاد✔️
صفت ابہام
ان میں کوئی نہیں۔

Correct Answer Logic:

'Sanat-e-Tazaad' (صفت تضاد) refers to the use of antonyms or opposing concepts in literature/grammar.

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Mathematics QUESTION #4091

Question 7673

Consider \(T:\mathbb{R}^3\to\mathbb{R}^2\) defined by \(T(x,y,z)=(|x|,y+z)\). To show \(T\) is NOT linear, the simplest counterexample uses scalar multiplication with \(c=-1\) and vector \((1,0,0)\):

Both \(T(c\mathbf{v})\) and \(cT(\mathbf{v})\) equal \((1,0)\)
Both equal \((-1,0)\)
They differ: \(T(-1,0,0)=(1,0)\) but \(-T(1,0,0)=(-1,0)\)✔️
They differ: \(T(-1,0,0)=(0,-1)\) but \(-T(1,0,0)=(0,1)\)

Correct Answer Logic:

For linearity, \(T(c\mathbf{v})=cT(\mathbf{v})\). With \(\mathbf{v}=(1,0,0)\) and \(c=-1\): \(T(-1,0,0)=(|-1|,0)=(1,0)\), but \(-1\cdot T(1,0,0)=-1\cdot(1,0)=(-1,0)\). Since \((1,0)\neq(-1,0)\), \(T\) is NOT linear — homogeneity fails.

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Physics QUESTION #7864

Question 7674

Angle swept by line perpendicular to rotation axis is called:

Angular acceleration
Angular displacement✔️
Angular momentum
Angular velocity

Correct Answer Logic:

Angular displacement (θ).

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Math Physics Chemistry Biology QUESTION #11267

Question 7675

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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English QUESTION #8543

Question 7676

They learned to cook _______ their mothers.

by
with
through
from✔️

Correct Answer Logic:

'Learned from' means acquired knowledge from.

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English QUESTION #2754

Question 7677

Which sentence is a SECOND CONDITIONAL?

If it rains✔️
I will take an umbrella.
If I were rich
I would travel the world.

Correct Answer Logic:

she would have passed.

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The Elections Act 2017 QUESTION #9425

Question 7678

Under Section 53(3), the Returning Officer must submit the list of Presiding Officers and Polling Officers (including reserved staff) to the District Returning Officer for approval at least how many days before polling day?

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

Correct Answer Logic:

Section 53(3) states: 'The Returning Officer shall, at least thirty days before the polling day, submit to the District Returning Officer for approval a list of such Presiding Officers, Assistant Presiding Officers and Polling Officers.'

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Aptitude QUESTION #10946

Question 7679

In a floor plan, a room shown as 4 cm × 3 cm at scale 1:50 would have what actual floor area?

30 m²
3 m²✔️
300 m²
0.3 m²

Correct Answer Logic:

Scale 1:50 → 1 cm on plan = 50 cm = 0.5 m in reality.

Actual length = \(4 \times 50 = 200\ \text{cm} = 2\ \text{m}\

Actual width = \(3 \times 50 = 150\ \text{cm} = 1.5\ \text{m}\

Actual area = \(2 \times 1.5 = \mathbf{3\ \text{m}^2}\

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Boilers Mechanical Engineering QUESTION #2479

Question 7680

In the vector loop method for position analysis of an RRR dyad with links \(L_2\) and \(L_3\), the vector closure equation projected onto the x-axis gives:

\(L_2\sin\phi_2 + L_3\sin\phi_3 = x_B - x_A\)
\(L_2\cos\phi_2 + L_3\cos\phi_3 = x_B - x_A\)✔️
\(L_2\cos\phi_2 - L_3\cos\phi_3 = x_B - x_A\)
\(L_2\phi_2 + L_3\phi_3 = x_B - x_A\)

Correct Answer Logic:

For the RRR dyad, the vector loop equation projected on x gives \(L_2\cos\phi_2 + L_3\cos\phi_3 = x_B - x_A\) and on y gives \(L_2\sin\phi_2 + L_3\sin\phi_3 = y_B - y_A\).

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