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Bio-Technology QUESTION #10586

The volumetric oxygen transfer coefficient $k_La$ in a stirred bioreactor can be increased by:

Decreasing agitation speed and reducing aeration rate
Increasing agitation speed, aeration rate, and reducing broth viscosity✔️
Adding antifoam agents, which increase bubble coalescence
Operating at lower temperature to increase oxygen solubility

Correct Answer Logic:

$k_La$ (h⁻¹) quantifies the rate of oxygen transfer from gas bubble to liquid per unit driving force. It increases with: (1) higher agitation speed (breaks bubbles, increases interfacial area $a$), (2) higher aeration rate (more gas hold-up), and (3) lower broth viscosity (faster liquid-film renewal). Adding antifoam reduces bubble coalescence resistance but can also reduce $k_La$ by coating bubble surfaces. Temperature increase raises $k_La$ but lowers $O_2$ solubility ($C^*$).

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General Knowledge QUESTION #9015

Question 82

Myanmar is the new name for which former country?

Barma (Burma)✔️
Nepal
Bhutan
Tibet

Correct Answer Logic:

Myanmar was formerly known as Burma.

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Physics QUESTION #422

Question 83

The heat produced by a current I in the wire of resistance R during time interval t is

I?/Rt
I?Rt✔️
I?/R/t
IR?t

Correct Answer Logic:

Heat = I?Rt (Joule heating formula)

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Civil Procedure QUESTION #5678

Question 84

A party moves for a new trial under Rule 59. What is the maximum time limit for filing this motion after the entry of judgment?

14 days.
21 days.
28 days.✔️
30 days.

Correct Answer Logic:

Rule 59(b) and (e) both specify a time limit of no later than 28 days after the entry of judgment.

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English QUESTION #2682

Question 85

Select the correct preposition: 'She has been waiting for the bus ___ 8:00 AM.'

for
since✔️
from
at

Correct Answer Logic:

'Since' is used to denote a specific point in time in the past up to the present.

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Mathematics QUESTION #11134

Question 86

The vector field $\mathbf{V} = (-4x-6y+3z)\,\mathbf{i} + (-2x+y-5z)\,\mathbf{j} + (5x+6y+az)\,\mathbf{k}$ is solenoidal for $a=$

$1$
$2$
$3$✔️
$4$

Correct Answer Logic:

For a solenoidal field, $\nabla \cdot \mathbf{V} = 0$. Computing: $\dfrac{\partial}{\partial x}(-4x-6y+3z) + \dfrac{\partial}{\partial y}(-2x+y-5z) + \dfrac{\partial}{\partial z}(5x+6y+az) = -4 + 1 + a = 0$. Therefore $a - 3 = 0$, giving $\boxed{a = 3}$.

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General Knowledge QUESTION #11511

Question 87

Which key allows entering spaces or navigating within active cells or dialogs in Excel?

Shift
Esc
Tab
Space✔️

Correct Answer Logic:

Space bar inserts a space character in an active cell or allows movement within dialog boxes. In cell navigation, Tab moves to the next cell; Shift+Tab moves to the previous cell; Esc cancels editing. The Space key specifically allows entering space content in cells.

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Islamic Studies QUESTION #8247

Question 88

Which one of these is a Modni Surah?

Al-Namal
Al-Qasas
Al-Baqarah✔️
Al-Luqman

Correct Answer Logic:

Surah Al-Baqarah is a Madani Surah (revealed in Medina). Madani Surahs were revealed after the Hijrah and typically deal with legal, social, and community matters. Surah Al-Baqarah is the longest Surah with 286 verses and covers various topics including laws of marriage, divorce, inheritance, fasting, Hajj, and jihad. Al-Namal, Al-Qasas, and Al-Luqman are all Makki Surahs revealed in Makkah before the migration.

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Contracts QUESTION #5866

Question 89

A Seller repudiates a contract three weeks before the delivery date. Can the Buyer sue immediately?

No, the Buyer must wait until the date of performance.
Yes, the Buyer can treat the anticipatory repudiation as an immediate breach.✔️
Yes, but only if the Buyer is a merchant.
No, unless the contract is for more than $10,000.

Correct Answer Logic:

Under UCC §2-610, when either party repudiates the contract with respect to a performance not yet due, the aggrieved party may resort to any remedy for breach.

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MCQs Section QUESTION #5115

Question 90

چہارشنبہ ہفتے کا کون سا دن ہے؟

اتوار
پیر
منگل
بدھ✔️

Correct Answer Logic:

چہارشنبہ فارسی میں چوتھے دن یعنی بدھ کے لیے استعمال ہوتا ہے۔

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Law QUESTION #9488

Question 91

A seeks specific performance of a contract to sell land. The trial Court grants a preliminary decree directing B to execute the sale deed within 60 days. B fails to do so. A applies for a final decree. B now claims the preliminary decree itself is executable and A should have executed it; hence A's application is time-barred. Is B's argument correct?

No; only a High Court can execute a preliminary decree
Yes; all decrees are executable from the date of passing
No; a preliminary decree is one where further proceedings remain to be taken before the suit is completely disposed of; a final decree must be passed and only thereafter executed✔️
Yes; a preliminary decree is fully executable immediately

Correct Answer Logic:

The definition of decree under Section 2(2) CPC distinguishes between a preliminary decree (where further proceedings must be taken before the suit is completely disposed of) and a final decree (which completely disposes of the suit). A preliminary decree in a specific performance suit requires a final decree before full execution.

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Psychology QUESTION #11348

Question 92

As per text, Psychology can most appropriately be defined as the science/study of:

of human psyche
of human and animal behaviour✔️
of mental life
of behaviour disorders

Correct Answer Logic:

Psychology is most appropriately defined as the study of human and animal behaviour.

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English Literature QUESTION #10710

Question 93

In a list of languages ranked by number of native (L1) speakers, English comes at which position?

1st
2nd
3rd✔️
4th

Correct Answer Logic:

By number of native (L1) speakers, English ranks 3rd after Mandarin Chinese (1st) and Spanish (2nd). However, when total speakers (including L2/foreign language speakers) are counted, English ranks 1st or 2nd globally. This question specifically asks about native speakers, where the ranking is: Mandarin → Spanish → English.

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Ability / HR / Governance / Special Education QUESTION #1915

Question 94

Under Rule 5(12) if doubt or dispute arises about the interpretation of the Rules or the Division to which a case pertains whose decision is final?

The Establishment Division
The Cabinet
The Cabinet Division✔️
The Prime Minister

Correct Answer Logic:

Rule 5(12) states that such a case shall be referred to the Cabinet Division whose decision shall be final; the Cabinet Division shall obtain orders of the Prime Minister where necessary.

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Reading and Writing (Module-1) QUESTION #5427

Question 95

Rydra Wong in Delany's?*Babel-17*?is a poet, an occupation which in his work is not ____: nearly a dozen of his characters are poets.

infallible
atypical✔️
lucrative
tedious

Correct Answer Logic:

Since many characters are poets, being a poet is not "atypical" (unusual).

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3003

Question 96

What is the primary function of an 'Emulsifying Agent'?

To increase surface tension
To reduce interfacial tension✔️
To prevent the drug from dissolving
To change the color of the mixture

Correct Answer Logic:

Emulsifiers lower the interfacial tension between the two immiscible liquids to stabilize the emulsion.

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Geology QUESTION #10641

Question 97

The primary driving mechanism behind the drifting (movement) of tectonic plates and continents is:

Volcanic eruptions at the surface
Mantle convection and tectonic plate interactions✔️
Folding and faulting of surface rocks
Changes in surface landform geometry

Correct Answer Logic:

Plate tectonics — driven primarily by mantle convection currents (heat-driven flow in the viscous mantle), ridge push (elevated mid-ocean ridges push plates apart), and slab pull (dense subducting slabs drag plates toward trenches) — is the mechanism responsible for continental drift. Wegener proposed continental drift in 1912; the mechanism was later explained by seafloor spreading (Hess, 1960) and plate tectonic theory.

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Physics and Math QUESTION #780

Question 98

$R = ?$ (circumradius of a triangle)

$\dfrac{abc}{4\Delta}$✔️
$abc$
$\dfrac{abc}{\Delta}$
None

Correct Answer Logic:

The circumradius of a triangle is $R = \dfrac{abc}{4\Delta}$, where $\Delta$ is the area of the triangle.

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Physics QUESTION #1152

Question 99

The energy of a simple harmonic motion depends upon:

Mass
Frequency
Both Mass and Frequency✔️
None of these

Correct Answer Logic:

The total energy of SHM is given by $E = \frac{1}{2}m\omega^2 A^2 = 2\pi^2 m f^2 A^2$, where $m$ is mass, $f$ is frequency, and $A$ is amplitude. So energy depends on both mass and frequency.

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General Knowledge QUESTION #8276

Question 100

In computer networking, what does the term WAP service refer to?

Wireless Networking✔️
Wired Networking
Both a and b
None of these

Correct Answer Logic:

WAP (Wireless Application Protocol) is related to wireless networking.

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