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Physics QUESTION #4382

The work done by the gravitational force on an object as it moves from a reference level to a higher point is:

Always positive
Always negative✔️
Zero
Depends on the path taken

Correct Answer Logic:

Gravitational force acts downward. When an object moves upward (against gravity), the force and displacement are in opposite directions ($\theta = 180°$), so $W = Fd\cos180° < 0$. Work done by gravity is always negative when moving upward.

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Electrical Engineering QUESTION #2179

Question 5562

A lossless $50\,\Omega$ transmission line of electrical length $\lambda/4$ is terminated with $Z_L = 25\,\Omega$. The input impedance seen at the source is:

$100\,\Omega$✔️
$25\,\Omega$
$50\,\Omega$
$12.5\,\Omega$

Correct Answer Logic:

Quarter-wave transformer property: $Z_{in} = \frac{Z_0^2}{Z_L} = \frac{(50)^2}{25} = \frac{2500}{25} = 100\,\Omega$.

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English QUESTION #2719

Question 5563

Which word is spelled correctly?

Separate✔️
Seperate
Saparate
Seperat

Correct Answer Logic:

A common mistake is using 'e' instead of 'a' in the middle of 'separate'.

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English QUESTION #8430

Question 5564

Identify the correctly spelled word:

Challenge✔️
Chalange
Challenge
Chalang

Correct Answer Logic:

Correct spelling is 'Challenge' (option a).

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3662

Question 5565

'Balsams' are resins that contain a high proportion of:

Benzoic or Cinnamic acids✔️
Water
Sugar
Alkaloids

Correct Answer Logic:

Balsam of Tolu and Balsam of Peru are examples.

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Library Sciences QUESTION #1565

Question 5566

Which protocol enables interoperability between different library systems by allowing one system to query the catalogues of another using a standard search interface?

HTTP
FTP
Z39.50✔️
SMTP

Correct Answer Logic:

Z39.50 is a client-server protocol that enables one library system (client) to search and retrieve records from another system's database (server) using a standardized interface. It is fundamental to union catalogue searching, shared cataloguing, and federated search systems.

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Geography QUESTION #1247

Question 5567

The process involved in Himalayan orogeny is:

Volcanism
Plate convergence✔️
Plate divergence
None of these

Correct Answer Logic:

The Himalayan mountain range was formed by the convergence (collision) of the Indian Plate and the Eurasian Plate, which began approximately 50 million years ago. As the Indian subcontinent moved northward and collided with Eurasia, the intervening Tethys Sea sediments were folded and uplifted to form the Himalayas. This is a classic example of continent-continent collision.

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Electrical Engineering QUESTION #2153

Question 5568

In Power Electronics, a Freewheeling Diode is used in an inductive load circuit to:

Increase the output voltage
Prevent high-voltage spikes $L\frac{di}{dt}$ during turn-off✔️
Rectify the AC input
Smooth the ripple in the capacitor

Correct Answer Logic:

The diode provides a path for the inductive current to continue flowing when the switch opens, preventing damaging $L\frac{di}{dt}$ voltage spikes.

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MCQs Section QUESTION #5167

Question 5569

اقبالِ جرم کس کتاب کا دیباچہ ہے؟

سرخ فیتہ
شہاب نامہ✔️
نفسانے
ان میں سے کوئی نہیں

Correct Answer Logic:

اقبالِ جرم شہاب نامہ کا دیباچہ ہے۔

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Chemistry QUESTION #5536

Question 5570

Which isotope of hydrogen emits low-energy $\beta^-$ particles?

Proton $H^+$
Tritium $^3_1H$✔️
Protium $^1_1H$
Deuterium $^2_1H$

Correct Answer Logic:

Tritium ($^3_1H$) is a radioactive isotope of hydrogen containing 1 proton and 2 neutrons. It undergoes beta decay: $^3_1H \to ^3_2He + \beta^- + \bar{\nu}_e$. The emitted $\beta^-$ particles have very low energy (~18 keV max). Protium and deuterium are stable; $H^+$ is simply a proton with no radioactivity.

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Physics QUESTION #7081

Question 5571

A pendulum clock loses $12\text{ s/day}$ at $40^{\circ}\text{C}$ and gains $4\text{ s/day}$ at $20^{\circ}\text{C}$. Find the temperature for correct time and the coefficient of linear expansion $\alpha$.

$60^{\circ}\text{C}$, $\alpha=1.85 \times 10^{-4}/^{\circ}\text{C}$
$30^{\circ}\text{C}$, $\alpha=1.85 \times 10^{-3}/^{\circ}\text{C}$
$55^{\circ}\text{C}$, $\alpha=1.85 \times 10^{-2}/^{\circ}\text{C}$
$25^{\circ}\text{C}$, $\alpha=1.85 \times 10^{-5}/^{\circ}\text{C}$✔️

Correct Answer Logic:

The change in time is given by $\Delta t = \frac{1}{2} \alpha \Delta \theta \times t$.

$12 = \frac{1}{2} \alpha (40 - \theta) \times 86400$
$-4 = \frac{1}{2} \alpha (20 - \theta) \times 86400$
Dividing the equations gives $\theta = 25^{\circ}\text{C}$.
Substituting $\theta$ back gives $\alpha = 1.85 \times 10^{-5}/^{\circ}\text{C}$.

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Mathematics QUESTION #11176

Question 5572

The boundary of a subset $B = \left\{\dfrac{1}{n}: n\in\mathbb{N}\right\}$ of $(\mathbb{R},d)$ is:

$B$
$\{0\}$
$B\cup\{0\}$✔️
$\emptyset$

Correct Answer Logic:

The boundary $\partial B = \overline{B}\cap\overline{B^c}$. The closure of $B$ is $\overline{B} = B\cup\{0\}$ (since $0$ is the only limit point of $B$). The interior of $B$ is empty (no open interval is contained in $B$). Therefore $\partial B = \overline{B}\setminus B^0 = B\cup\{0\}$.

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Bio-Technology QUESTION #10568

Question 5573

In a chemostat at steady state, the dilution rate $D$ equals:

The maximum specific growth rate $\mu_{max}$
The specific growth rate $\mu$✔️
The substrate feed concentration $S_{in}$
The maintenance coefficient $m_S$

Correct Answer Logic:

At chemostat steady state, washout of cells equals growth: $\dfrac{dx}{dt} = 0 = (\mu - D)x$. Since $x \neq 0$, we must have $\mathbf{\mu = D}$. The dilution rate $D = F/V$ (h⁻¹) therefore directly sets the specific growth rate. This is the fundamental principle of the chemostat — the operator controls $D$, which fixes $\mu$, which in turn fixes the steady-state substrate concentration via the Monod equation.

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General Knowledge QUESTION #8267

Question 5574

In MS Word 2007, which shortcut key combination increases the left indent of a paragraph?

Ctrl + L
Ctrl + M✔️
Alt + I
Ctrl + Shift + M

Correct Answer Logic:

Ctrl + M increases the left indent in MS Word.

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Biology Zoology Botany QUESTION #1335

Question 5575

The monosaccharide which is readily absorbed through the intestine independent of Sodium ions is:

Fructose✔️
Glucose
Galactose
None of these

Correct Answer Logic:

Fructose is absorbed through the intestinal epithelium via facilitated diffusion using the GLUT5 transporter — a process that is independent of sodium ions. In contrast, glucose and galactose are absorbed via the sodium-dependent secondary active transport mechanism (SGLT1 cotransporter), which requires Na$^+$ co-transport.

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Maths QUESTION #4559

Question 5576

Compare $1.83$ and $1.823$:

$1.83 > 1.823$✔️
$1.83 < 1.823$
$1.83 = 1.823$
Cannot compare

Correct Answer Logic:

Write as $1.830$ and $1.823$. Since $1830 > 1823$, we have $1.83 > 1.823$

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MCQs Section QUESTION #4888

Question 5577

Which word is opposite to "PRETEND"

Sham
Substantiate✔️
Feign
Fabricate

Correct Answer Logic:

Pretend means to act as if something is true when it is not. Its antonym is Substantiate, meaning to provide evidence to prove something as real and true.

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Biology Zoology Botany QUESTION #1383

Question 5578

In angiosperms, how many nuclei are present in a mature embryo sac?

6
7
8✔️
9

Correct Answer Logic:

A mature angiosperm embryo sac (megagametophyte) contains 8 nuclei organised into 7 cells: 3 antipodal cells (3 nuclei), 2 synergid cells (2 nuclei), 1 egg cell (1 nucleus), and 1 central cell with 2 polar nuclei (2 nuclei). Total = 3+2+1+2 = 8 nuclei in 7 cells. This is the standard Polygonum-type embryo sac.

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General Knowledge QUESTION #8601

Question 5579

Which provincial chief minister was dismissed due to the One Unit issue?

Chief Minister NWFP
Chief Minister Sindh
Chief Minister Punjab✔️
Chief Minister Baluchistan

Correct Answer Logic:

The Chief Minister of Punjab was dismissed over the One Unit scheme.

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Accounting & Finance QUESTION #6174

Question 5580

A developer is evaluating a 'Lumpy Asset' for a project. Why might the 'Percentage of Sales' method fail here?

Lumpy assets grow exactly with sales
Lumpy assets are only acquired in large, discrete units and don't scale linearly✔️
Lumpy assets have no depreciation
Lumpy assets are always current assets

Correct Answer Logic:

Lesson 05 notes that lumpy assets (like a whole new factory) are a drawback of the method because they aren't added in small increments as sales grow.

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