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Electrical Engineering QUESTION #2160

A signal $x(t) = 5\cos(200\pi t) + 3\sin(400\pi t)$ is sampled at $f_s = 300\,\text{Hz}$. Which frequency component(s) experience aliasing?

Both $100\,\text{Hz}$ and $200\,\text{Hz}$✔️
$100\,\text{Hz}$ only
$200\,\text{Hz}$ only
No aliasing occurs

Correct Answer Logic:

The two components have frequencies $100\,\text{Hz}$ and $200\,\text{Hz}$. The Nyquist limit is $f_s/2 = 150\,\text{Hz}$. Since both exceed $150\,\text{Hz}$, both components alias.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3204

Question 5782

Where does the majority of glucose and amino acid reabsorption occur in the nephron?

Proximal Convoluted Tubule (PCT)✔️
Loop of Henle
Distal Convoluted Tubule
Collecting Duct

Correct Answer Logic:

Under normal conditions, $100\%$ of glucose is reabsorbed in the PCT.

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Civil Engineering QUESTION #6601

Question 5783

For a #3 stirrup or tie bar, the minimum required inside diameter of a standard hook bend is:

1.5 in
2.0 in
2.5 in
3.0 in✔️

Correct Answer Logic:

ACI 318 specifies that for $\#3$ through $\#5$ bars, the minimum inside bend diameter for stirrup/tie hooks is $4d_b$. For $\#3$ bar, $d_b = 0.375\,\text{in}$, so minimum inside diameter $= 4 \times 0.75 = 3\,\text{in}$ (using outside diameter relation — per ACI Table 25.3.2, inside diameter $= 4d_b = 1.5\,\text{in}$ — refer to applicable edition).

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General Abilities QUESTION #2885

Question 5784

Solve for $x$: $4x - 7 = 2x + 5$

3
6✔️
4
12

Correct Answer Logic:

$4x - 2x = 5 + 7 \implies 2x = 12 \implies x = 6$.

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English QUESTION #2661

Question 5785

Which word is similar in meaning to: 'ENIGMATIC'?

Simple
Mysterious✔️
Clear
Loud

Correct Answer Logic:

'Enigmatic' refers to something difficult to understand or 'mysterious'.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3458

Question 5786

'Bicarbonate' is the most important buffer in:

The stomach
The blood (extracellular fluid)✔️
The cell nucleus
The skin

Correct Answer Logic:

The $CO_2$ / $HCO_3^-$ system maintains blood $pH$.

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Math Physics Chemistry Biology QUESTION #7760

Question 5787

The hind leg bones found in whales are best described as:

Analogous to fish fins
Fossil structures from extinct ancestor
Homologous to bat wings
Vestigial structures✔️

Correct Answer Logic:

Vestigial structures are remnants of organs that had a function in ancestors but are reduced/non-functional in current species. Whale hind limb bones indicate evolution from four-legged land mammals.

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Math Physics Chemistry Biology QUESTION #522

Question 5788

Humming birds belong to the category

Heterotherms✔️
Endotherms
Ectotherms
None of these

Correct Answer Logic:

Hummingbirds are heterotherms (can vary body temperature)

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Physics QUESTION #368

Question 5789

What is emitted by a hot metal filament in a cathode ray tube?

X-ray
Proton
Electron✔️
Photon

Correct Answer Logic:

Hot metal filaments emit electrons through thermionic emission

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English QUESTION #8472

Question 5790

Select the word OPPOSITE in meaning to: Fugitive

Immigrant
Refugee
Absconder
Captive✔️

Correct Answer Logic:

Fugitive means a person who flees; opposite is captive (one who is confined).

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Library Sciences QUESTION #1535

Question 5791

According to Stueart and Moran (2007), which type of planning establishes an organization's long-term direction, mission, and broad goals, typically covering a 3–5 year horizon?

Operational planning
Contingency planning
Strategic planning✔️
Tactical planning

Correct Answer Logic:

Strategic planning in library management sets the long-term direction of the institution — defining mission, vision, and broad goals over a multi-year horizon. Operational planning deals with day-to-day activities, while tactical planning addresses medium-term implementation steps.

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Chemistry QUESTION #7380

Question 5792

Which of the following is a WRONG statement?

The uncertainty principle is $\Delta E \cdot \Delta t \geq \dfrac{h}{4\pi}$
Half-filled and fully filled orbitals are more stable due to exchange energy, symmetry, and balanced electron arrangement
In hydrogen-like atoms, the energy of the 2s orbital is less than that of 2p orbital✔️
de Broglie wavelength is $\lambda = \dfrac{h}{mv}$ where $v$ is the group velocity of the particle

Correct Answer Logic:

Analysis of option (3):
In hydrogen and hydrogen-like (one-electron) atoms, orbitals with the same $n$ are degenerate — 2s and 2p have the same energy (energy depends only on $n$). The statement that 2s energy is less than 2p is only true for multi-electron atoms (due to penetration and shielding). Hence option (3) is wrong for hydrogen-like atoms.

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Urdu QUESTION #5224

Question 5793

استعارے کے لغوی معنی ہیں؟

ادھار لینا✔️
اشارہ کرنا
نقد کی چیز لینا
ان میں سے کوئی نہیں

Correct Answer Logic:

استعارے کے لغوی معنی ادھار لینا یا مستعار لینا ہیں۔ یہی وجہ ہے کہ اس میں ایک چیز کا نام دوسری کو دیا جاتا ہے۔

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Math Physics Chemistry Biology QUESTION #4302

Question 5794

Which of the following blood vessels have the lowest blood velocity, with correct reason?

Arteries: Due to thick walls
Capillaries: due to highest overall cross-sectional area✔️
Veins: due to blood flow against gravity
Capillaries: Due to two-way blood flow in capillaries

Correct Answer Logic:

Blood velocity is lowest in capillaries because the total cross-sectional area of all capillaries combined is the greatest, so by continuity, blood slows down significantly.

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HR and Management QUESTION #6453

Question 5795

'Expertise' as a factor in HRM's growing importance refers to:

Hiring managers with advanced degrees
Sophisticated personnel activities requiring special knowledge and statistical methods✔️
Outsourcing HR functions to consultants
Using expensive HRIS software systems

Correct Answer Logic:

Expertise refers to sophisticated personnel activities that require special expertise, such as complex employee-selection procedures using statistical formulas combining interviews, test scores, and application information, replacing subjective traditional interviews.

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Law QUESTION #9502

Question 5796

A plaintiff sues on a bond. The defendant pleads payment. The Court holds that payment has been proved and dismisses the suit. The plaintiff appeals. The appellate Court, without additional evidence, reverses the trial Court and decrees the suit. The defendant files a second appeal. Is the second appeal competent?

No; second appeals on questions of fact are generally not entertained
Yes; a second appeal lies only if the High Court is satisfied that the case involves a substantial question of law, such as improper appreciation of evidence to the point of legal error, or if the appellate Court reversed findings without lawful basis✔️
No; second appeals are never maintainable in money suits
Yes; any party aggrieved by an appellate decree can file a second appeal

Correct Answer Logic:

Section 100 CPC provides that a second appeal lies only on a substantial question of law. However, if the first appellate Court misapplied legal principles in appreciating evidence or reversed findings of fact without reasoning, that can itself constitute a substantial question of law. The second appeal is competent if such a question is involved.

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Accounting & Finance QUESTION #9630

Question 5797

The Debtors Control Account had an opening balance of Rs. 70,000. Credit sales for May were Rs. 26,000, sales returns Rs. 3,400, cash/cheques received from debtors Rs. 46,000, and discounts allowed Rs. 3,700. What is the closing balance of the Debtors Control Account?

Rs. 42,900✔️
Rs. 46,600
Rs. 46,000
Rs. 39,900

Correct Answer Logic:

Debtors Control Account: Opening Dr. 70,000 + Credit Sales 26,000 = 96,000. Less: Returns 3,400 + Receipts 46,000 + Discounts 3,700 = 53,100. Closing balance = 96,000 – 53,100 = Rs. 42,900.

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English QUESTION #8509

Question 5798

The fire was finally brought _______ control.

to
on
under✔️
at

Correct Answer Logic:

'Brought under control' means subdued.

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Math Physics Chemistry Biology QUESTION #4267

Question 5799

Which part of the brain contains central chemoreceptors that monitor $CO_2$ levels in blood?

Pons
Midbrain
Hypothalamus
Medulla oblongata✔️

Correct Answer Logic:

The medulla oblongata contains central chemoreceptors that detect changes in $CO_2$ and pH of cerebrospinal fluid, regulating the breathing rate.

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Chemistry QUESTION #4374

Question 5800

Correct arrangement of orbital according to size of hybridized orbitals:

$sp > sp^2 > sp^3$
$sp^3 > sp > sp^2$
$sp^2 > sp > sp^3$
$sp^3 > sp^2 > sp$✔️

Correct Answer Logic:

The size of hybridized orbitals increases with increasing $sp^3$ character: $sp^3 > sp^2 > sp$. This is because more p-character means more diffuse, larger orbitals, and $sp^3$ has the most p-character (75%).

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