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Physics QUESTION #1058

An electron (mass $9\times10^{-31}\ \text{kg}$, charge $1.6\times10^{-19}\ \text{C}$) moves at $c/100$ in field $B=9\times10^{-4}\ \text{T}$. Electric field $E$ to prevent deflection:

E parallel to B, magnitude $27\times10^2\ \text{V/m}$
E parallel to B, magnitude $27\times10^4\ \text{V/m}$
E perpendicular to B, magnitude $27\times10^4\ \text{V/m}$✔️
E perpendicular to B, magnitude $27\times10^2\ \text{V/m}$

Correct Answer Logic:

For no deflection: electric force must balance magnetic force. $qE=qvB\Rightarrow E=vB=\frac{3\times10^8}{100}\times9\times10^{-4}=3\times10^6\times9\times10^{-4}=27\times10^2\ \text{V/m}$. E must be perpendicular to B (to oppose magnetic force direction). So E perpendicular to B, magnitude $27\times10^2\ \text{V/m}$ = option (4).

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English QUESTION #2787

Question 2242

Choose the correct word: 'You must ___ to the terms of the contract.' (Note: 'Comply' means to act in accordance with; 'Imply' means to suggest indirectly)

Imply
Comply✔️
Reply
Apply

Correct Answer Logic:

'Comply' means to act in accordance with a wish, order, or rule. 'You must comply with the terms of the contract' is correct. 'Imply' means to suggest something indirectly, which doesn't fit here.

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Reading and Writing (Module-1) QUESTION #5327

Question 2243

Regarding the bioluminescent jellyfish, when does the glow typically occur?

When the jellyfish is disturbed by a predator.✔️
During the daylight hours.
Continuously throughout the night.
Only when the water temperature rises.

Correct Answer Logic:

The text specifies the glow happens when the organism is 'disturbed.'

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Chemistry QUESTION #7791

Question 2244

Which is a strong electrolyte in aqueous solution?

Acetic acid
Ammonium hydroxide
Carbonic acid
Potassium iodide✔️

Correct Answer Logic:

Strong electrolytes dissociate completely. KI is an ionic salt → strong electrolyte. Acetic acid, NH₄OH, H₂CO₃ are weak electrolytes.

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Boilers Mechanical Engineering QUESTION #4025

Question 2245

'Differential Pressure' across an air filter indicates:

The speed of the boiler
How clogged or dirty the filter is✔️
The temperature of the room
The price of the air

Correct Answer Logic:

High 'DP' means the filter needs cleaning or replacement.

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The Elections Act 2017 QUESTION #9404

Question 2246

Under Section 4(2), directions or orders issued by the Commission shall be enforceable throughout Pakistan and shall be executed as if issued by:

The Supreme Court of Pakistan
The Federal Government
The High Court✔️
The President of Pakistan

Correct Answer Logic:

Section 4(2) specifically states that such directions shall be executed as if issued by the High Court — not the Supreme Court.

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Geography QUESTION #6339

Question 2247

The concept of 'carrying capacity' applied to tourism destinations refers to:

Maximum number of tourists that can be accommodated in hotels
Maximum number of visitors a site can sustain without unacceptable environmental or social impacts✔️
Peak season tourist arrivals
Economic threshold for tourism profitability

Correct Answer Logic:

Tourism carrying capacity is the maximum number of visitors a destination can sustain without causing unacceptable deterioration of physical environment, degradation of visitor experience, or adverse impacts on local community.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3434

Question 2248

The 'Isoelectric Point' ($pI$) of a protein is the $pH$ at which it:

Has a maximum positive charge
Has a maximum negative charge
Has a net charge of zero✔️
Is most soluble

Correct Answer Logic:

At this $pH$, the protein does not move in an electric field.

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Accounting Finance and Punjab Sales Tax on Services QUESTION #2576

Question 2249

Under section 9(1), when a service is provided over a period of time with periodic payments, how is the service treated for tax purposes?

As a single service taxable at the date of first payment
As comprising two or more separate and distinct services, each corresponding to the part of the service to which each separate payment relates✔️
The entire service is taxable when the contract is signed
Tax is chargeable only upon final completion of the service

Correct Answer Logic:

Section 9(1) treats periodically paid services as COMPRISING TWO OR MORE SEPARATE AND DISTINCT SERVICES, each corresponding to the part to which each separate payment relates. However, section 9(2) clarifies this does NOT apply to services paid on installment basis.

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English QUESTION #8324

Question 2250

Tick the word SIMILAR in meaning to: Dubious

certain
doubtful✔️
rigorous
feeble

Correct Answer Logic:

Dubious means doubtful or uncertain.

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English QUESTION #2698

Question 2251

Select the correctly punctuated possessive form:

The childrens' toys are here.
The children's toys are here.✔️
The childrens toys are here.
The childrens's toys are here.

Correct Answer Logic:

'Children' is already plural; to show possession, add 's.

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General Knowledge QUESTION #8767

Question 2252

How many member states are currently in the United Nations (UNO)?

191
192
193✔️
194

Correct Answer Logic:

As of 2025, there are 193 UN member states.

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Geography QUESTION #6297

Question 2253

The hydrostatic equation governing vertical pressure gradient in atmospheric science describes which relationship?

The barometric law of pressure decrease with altitude
The relationship between pressure change with height equaling negative density times gravity✔️
The relationship between temperature and pressure in adiabatic processes
The geostrophic balance in rotating reference frames

Correct Answer Logic:

The fundamental hydrostatic equation states that pressure change with height equals negative density times gravity. It governs the vertical pressure distribution in the atmosphere under hydrostatic equilibrium.

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Civil / Architecture QUESTION #2372

Question 2254

In prestressed concrete design, the concept of the 'load balancing method' (T.Y. Lin's method) involves selecting the tendon profile such that the transverse component of prestress forces:

Maximizes the bending moment at midspan to increase the section capacity
Exactly balances a chosen portion of the applied gravity loads, resulting in a uniformly stressed (axially loaded) cross-section under the balanced load✔️
Eliminates all tensile stresses in the section at every load level
Positions the pressure line (C-line) at the kern point of the section

Correct Answer Logic:

In the load balancing method (T.Y. Lin, 1963), the tendon is profiled (typically parabolic for UDL) so its vertical component exactly counteracts a chosen portion of the gravity load (usually dead load or total service load). Under the balanced load $w_b = \dfrac{8 P e}{L^2}$, the beam is in pure axial compression with uniform stress $f = P/A$. Remaining loads (unbalanced) are analyzed by conventional elastic methods.

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Chemistry QUESTION #1009

Question 2255

The molar solubility ($s$) of zirconium phosphate with formula $(\text{Zr}^{4+})_3(\text{PO}_4^{3-})_4$ is given by the relation:

$\left(\dfrac{K_{sp}}{9612}\right)^{1/3}$
$\left(\dfrac{K_{sp}}{6912}\right)^{1/7}$✔️
$\left(\dfrac{K_{sp}}{8435}\right)^{1/7}$
$\left(\dfrac{K_{sp}}{5348}\right)^{1/6}$

Correct Answer Logic:

Dissolution: $\text{Zr}_3(\text{PO}_4)_4 \rightleftharpoons 3\text{Zr}^{4+} + 4\text{PO}_4^{3-}$. If solubility $= s$: $[\text{Zr}^{4+}]=3s$, $[\text{PO}_4^{3-}]=4s$. $K_{sp} = (3s)^3(4s)^4 = 27s^3 \cdot 256s^4 = 6912\,s^7$. So $s = \left(\dfrac{K_{sp}}{6912}\right)^{1/7}$.

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Accounting & Finance QUESTION #6216

Question 2256

In the context of 'Audit Risk', if the Auditor assesses the 'Control Risk' ($CR$) as $1$ (100%), what is the logical implication for the audit strategy?

The auditor can reduce the amount of substantive testing
The auditor should rely on the internal control questionnaire
The auditor must adopt an extensive substantive approach✔️
The auditor should issue a modified report immediately

Correct Answer Logic:

If controls are weak ($CR$ is high), the auditor cannot rely on them and must perform extensive testing of transactions and balances (substantive approach).

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Boilers Mechanical Engineering QUESTION #2452

Question 2257

For forced vibration isolation to be effective (transmissibility TR < 1), the frequency ratio $r = p/\omega_n$ must satisfy:

$r < 1$
$r = 1$
$r > \sqrt{2}$✔️
$r > 2$

Correct Answer Logic:

Isolation requires TR < 1, which occurs when $r=p/\omega_n>\sqrt{2}$. This means the machine operating speed $p$ must exceed $\sqrt{2}$ times the mounted natural frequency $\omega_n$.

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Law QUESTION #9680

Question 2258

Under Article 38, a confession made to a police officer:

Is admissible with corroboration
Is admissible if made voluntarily
Shall not be proved as against the accused✔️
Is admissible if witnessed by a Magistrate

Correct Answer Logic:

Article 38 categorically states that no confession made to a police officer shall be proved as against a person accused of any offence.

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General Abilities QUESTION #7978

Question 2259

If $\dfrac{3}{11}$ of a number is 22, what is $\dfrac{6}{11}$ of that number?

6
12
33
44✔️

Correct Answer Logic:

$\dfrac{3}{11} \times x = 22 \Rightarrow x = \dfrac{22 \times 11}{3} = \dfrac{242}{3}$
$\dfrac{6}{11} \times x = 2 \times 22 = 44$ (since $\dfrac{6}{11}$ is double $\dfrac{3}{11}$)

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Psychology QUESTION #9809

Question 2260

The term 'phenomenology' refers to:

A science of perception
Detailed analysis of our sensations
A naive description of our immediate experiences✔️
Scientific study of queer occurrences

Correct Answer Logic:

Phenomenology (Husserl, Merleau-Ponty) involves describing conscious experience as directly lived — a presuppositionless account of immediate subjective experience. It is foundational to humanistic and existential psychology.

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