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Volcanic bombs are large, coarse fragments of solidified or partially solidified lava ejected from a volcano during an eruption. They are typically larger than 64 mm in diameter and acquire a rounded or aerodynamic shape while in flight. Volcanic ash refers to tiny particles (less than 2 mm), and dust refers to the finest particles.

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Math Physics Chemistry Biology QUESTION #513

Question 4285

Which of the following receptors produce sensation of pain?

Mechanoreceptor
Nociceptors✔️
Chemoreceptors
Thermoreceptors

Correct Answer Logic:

Nociceptors detect pain

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Civil Engineering QUESTION #6581

Question 4286

If the 5-day BOD ($\text{BOD}_5$) of a wastewater sample is $150\,\text{mg/L}$ at $20°C$ with a rate constant $K = 0.23\,\text{day}^{-1}$, the Ultimate BOD ($L_0$) is approximately:

102.5 mg/L✔️
473.7 mg/L
219.5 mg/L
47.5 mg/L

Correct Answer Logic:

Using $\text{BOD}_5 = L_0(1 - e^{-Kt})$: $150 = L_0(1 - e^{-0.23 \times 5}) = L_0(1 - e^{-1.15}) = L_0 \times 0.683$. Therefore $L_0 = \dfrac{150}{0.683} \approx 219.6\,\text{mg/L}$. Note: Answer key states (a) — verify with base-10 form $K_{10} = 0.1/\text{day}$: $L_0 = \dfrac{150}{1-10^{-0.1\times5}} \approx 219\,\text{mg/L}$.

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General Knowledge QUESTION #4709

Question 4287

What was described as the major challenge facing China's rapidly growing economy around 2005?

Population Explosion✔️
Shortage of Energy
Challenges of WTO regime
Environmental Pollution

Correct Answer Logic:

While China faced multiple challenges, population pressure and managing growth were considered the most significant issues. The question reflects the context of early 2000s debates.

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Boilers Mechanical Engineering QUESTION #4010

Question 4288

'Thermal Efficiency' of a boiler is the ratio of:

Fuel used to steam produced
Heat absorbed by water/steam to the heat available from fuel combustion✔️
Pressure to temperature
Water volume to drum size

Correct Answer Logic:

It measures how well the boiler converts the energy in the fuel into steam.

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Planning QUESTION #4999

Question 4289

What is the recommended minimum population threshold for supporting a secondary school in neighborhood planning?

2,000-3,000
5,000-7,000
10,000-12,000✔️
15,000-20,000

Correct Answer Logic:

Planning standards typically recommend 10,000-12,000 population to support one secondary school (approximately 800-1,200 students assuming school-age population is 8-10% of total), ensuring viable enrollment and efficient resource utilization.

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Mathematics QUESTION #981

Question 4290

Let $E:\dfrac{x^2}{a^2}+\dfrac{y^2}{b^2}=1,\ a>b$ and $H:\dfrac{x^2}{A^2}-\dfrac{y^2}{B^2}=1$. Let the distance between the foci of $E$ and the foci of $H$ be $2\sqrt{3}$. If $a-A=2$ and the ratio of eccentricities of $E$ and $H$ is $\dfrac{1}{3}$, then the sum of the lengths of their latus rectums is equal to:

10
9
8✔️
7

Correct Answer Logic:

Let $e_E=e$ and $e_H=3e$. Focal distances: $2ae=2\sqrt{3}\Rightarrow ae=\sqrt{3}$ and $2Ae_H=2\sqrt{3}\Rightarrow 3Ae=\sqrt{3}\Rightarrow Ae=\frac{1}{\sqrt{3}}$. Then $\frac{a}{A}=3$ and $a-A=2\Rightarrow A=1, a=3$. So $e=\frac{\sqrt{3}}{3}=\frac{1}{\sqrt{3}}$, $b^2=a^2(1-e^2)=9\cdot\frac{2}{3}=6$. For $H$: $e_H=\sqrt{3}$, $B^2=A^2(e_H^2-1)=2$. Sum of latus rectums $=\frac{2b^2}{a}+\frac{2B^2}{A}=\frac{12}{3}+\frac{4}{1}=4+4=8$.

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MCQs Section QUESTION #4889

Question 4291

Which word is opposite to "LIBERTY"

Permission
Licence
Serfdom✔️
Bound

Correct Answer Logic:

Liberty means the state of being free. Its antonym is Serfdom, meaning the state of complete bondage and lack of freedom.

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Urdu QUESTION #5254

Question 4292

سیرِ کوہسار کس کی تصنیف ہے؟

آغا حشر
منشی پریم چند
رتن ناتھ سرشار✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

سیرِ کوہسار رتن ناتھ سرشار کی تصنیف ہے۔

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General Knowledge QUESTION #4753

Question 4293

May 3 is annually observed worldwide as which international day?

World Environment Day
Human Rights Day
World Press Freedom Day✔️
World Health Day

Correct Answer Logic:

May 3 is observed globally as World Press Freedom Day, declared by the UN General Assembly in 1993, to evaluate press freedom worldwide.

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Mathematics QUESTION #6029

Question 4294

Let $f:\mathbb{R}\to\mathbb{R}$ be defined as $f(x)=\begin{cases}5,&x\le1\\a+bx,&1

$a=5,\,b=5$
$a=-5,\,b=10$✔️
$a=0,\,b=5$
Not continuous for any $a,b$

Correct Answer Logic:

Continuity at $x=1$: $\lim_{x\to1^+}(a+bx)=a+b=5$ ...(i)

Continuity at $x=3$: $a+3b=b+15 \Rightarrow a+2b=15$ ...(ii)

Continuity at $x=5$: $b+25=30\Rightarrow b=5$ ...(iii)

From (iii): $b=5$. From (i): $a=5-5=0$... but check (ii): $0+10=10\neq15$. Contradiction!

Try option B: $a=-5, b=10$. Check (i): $-5+10=5$ ✓. Check (ii): $-5+20=15$ ✓. Check (iii): $10+25=35\neq30$ ✗.

No values make $f$ continuous, so the answer is not continuous for any $a, b$ (option D, index 3).

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The Constitution of Pakistan QUESTION #9342

Question 4295

Under Article 48(1) as amended, the President is required to return advice for reconsideration within what period, and must act on the reconsidered advice within what period?

Seven days; five days
Fifteen days; ten days✔️
Ten days; fifteen days
Thirty days; ten days

Correct Answer Logic:

Article 48(1) proviso, as amended by the 18th Amendment, sets a 15-day window within which the President may require reconsideration, and then a 10-day window within which the President must act on the advice rendered after reconsideration. The sequence and asymmetry of these periods is frequently tested.

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English QUESTION #2704

Question 4296

What is the term for: 'A speech made without previous preparation'?

Maiden
Extempore✔️
Elocution
Debate

Correct Answer Logic:

'Extempore' (or impromptu) describes a speech given without preparation.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3406

Question 4297

'Glycolysis' occurs in which part of the cell?

Mitochondria
Nucleus
Cytoplasm✔️
Ribosome

Correct Answer Logic:

Glycolysis breaks down glucose into pyruvate in the cytosol.

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General Knowledge QUESTION #8730

Question 4298

Which strait is called 'The Gate of Tears' (Bab-el-Mandeb)?

Strait of Gibraltar
Strait of Hormuz
Strait of Bab-el-Mandeb✔️
Malacca Strait

Correct Answer Logic:

Bab-el-Mandeb means 'Gate of Tears' in Arabic.

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General Knowledge QUESTION #2628

Question 4299

What does it mean when hardware is described as 'BACKWARD COMPATIBLE'?

Older hardware can only work with other older hardware of the same generation
Newer hardware works exclusively with only the newest components available
Older hardware works with newer hardware✔️
Hardware that has been returned to the manufacturer for refurbishment

Correct Answer Logic:

Backward compatible means older hardware works with newer hardware. For example, a USB 3.0 port is backward compatible with USB 2.0 devices — you can plug in an older USB 2.0 flash drive into a newer USB 3.0 port and it will still function.

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General Abilities QUESTION #2841

Question 4300

Find the Compound Interest on Rs. 5000 at $10\%$ per annum for 2 years (compounded annually).

Rs. 950
Rs. 1000
Rs. 1050✔️
Rs. 1100

Correct Answer Logic:

Amount $= P\left(1 + \dfrac{r}{100}\right)^n = 5000 \times \left(\dfrac{110}{100}\right)^2 = 5000 \times 1.21 = 6050$. CI $= 6050 - 5000 = Rs.\ 1050$.

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