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Electrical Engineering QUESTION #2153

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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Chemistry QUESTION #1432

Question 3102

Potentiometric titration involves measurement of:

Current in the reaction
Volume at equivalence
Electrode potential as a function of titrant added✔️
None of these

Correct Answer Logic:

Potentiometric titration involves monitoring the electrode potential (voltage) of the solution as a function of the volume of titrant added. The equivalence point is identified by a sharp change (inflection point) in the potential-volume curve. It uses a reference electrode and an indicator electrode immersed in the analyte solution, and is particularly useful for coloured or turbid solutions.

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General Ability and Fire Fighting QUESTION #5596

Question 3103

Which fire class involves live electrical equipment?

Class A
Class C✔️
Class D
Class K

Correct Answer Logic:

Class C fires involve live electrical equipment. CO2 and dry chemical extinguishers are used because they are non-conductive and will not cause electric shock.

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Chemistry QUESTION #1090

Question 3104

Molar conductivity $\Lambda_m = 90\ \text{S cm}^2\text{mol}^{-1}$ for $0.050\ \text{mol L}^{-1}$ monobasic weak acid. Degree of dissociation: [$\Lambda_+^\circ = 349.6$, $\Lambda_-^\circ = 50.4\ \text{S cm}^2\text{mol}^{-1}$]

0.225✔️
0.215
0.115
0.125

Correct Answer Logic:

$\Lambda_m^\circ = \Lambda_+^\circ + \Lambda_-^\circ = 349.6+50.4=400\ \text{S cm}^2\text{mol}^{-1}$. Degree of dissociation $\alpha = \frac{\Lambda_m}{\Lambda_m^\circ}=\frac{90}{400}=0.225$.

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Architecture QUESTION #2366

Question 3105

In the context of Green Building design, the Overall Thermal Transfer Value (OTTV) is a metric used to evaluate:

The amount of heat generated by building occupants and equipment per unit floor area
The total heat gain through the building envelope (walls, roofs, and fenestration) per unit area of the building facade, used to set energy performance benchmarks✔️
The coefficient of performance (COP) of the HVAC system
The total solar radiation incident on the building roof per year

Correct Answer Logic:

OTTV (Overall Thermal Transfer Value, in W/m²) is an energy code metric used in tropical and subtropical regions (including ECBC in Pakistan/India) that quantifies the total heat gain through the building envelope per unit external wall area. It accounts for conduction through opaque walls, solar radiation through windows (WWR, SHGC), and conductive heat through glazing. A lower OTTV indicates a more thermally efficient building envelope.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3625

Question 3106

Which of the following is a common 'Inhalant Allergen'?

Peanut butter
Pollen✔️
Penicillin
Bee sting

Correct Answer Logic:

Pollens, dust, and molds are common allergens taken in through breathing.

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Pakistan Affairs QUESTION #309

Question 3107

Which Mountain Range Separates Pakistan And Afghanistan?

Pamirs
The Hindu Kush✔️
Kirthar
Karakoram

Correct Answer Logic:

The Hindu Kush range forms the natural boundary between the two countries in the northwest.+1

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Child Health QUESTION #3926

Question 3108

A 20-month-old boy becomes extremely upset when his mother refuses a treat in the store. He cries intensely, then suddenly ceases breathing, turns cyanotic, and briefly loses consciousness with a short tonic-clonic episode. What is the appropriate next step in management?

Reassure the mother and explain breath-holding spells✔️
Perform an EEG to rule out epilepsy
Order a non-contrast CT head
Refer the child to a pediatric neurologist

Correct Answer Logic:

No explanation provided for this question.

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Basic Mathematics QUESTION #2864

Question 3109

The diameter of a circle is 20 cm. Find the circumference. (Take $\pi = 3.14$)

62.8 cm✔️
64.4 cm
66.2 cm
68.4 cm

Correct Answer Logic:

Circumference $= \pi d = 3.14 \times 20 = 62.8$ cm.

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Biology QUESTION #4299

Question 3110

Enzymes belong to which class of biomolecules?

Carbohydrates
Lipids
Proteins✔️
Nucleic acids

Correct Answer Logic:

Enzymes are biological catalysts made of proteins (polypeptide chains). Their catalytic activity depends on their specific three-dimensional protein structure.

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Mechanical Engineering QUESTION #2521

Question 3111

D'Alembert's principle converts a dynamics problem into an equivalent statics problem by introducing:

A fictitious potential energy
An inertial force $-m\mathbf{a}$ applied to the body so that $\sum\mathbf{F}-m\mathbf{a}=0$✔️
The work done by the net force
The angular momentum about the center of mass

Correct Answer Logic:

D'Alembert's principle: by adding the inertial force $-m\mathbf{a}$ to the real forces, the equation $\sum\mathbf{F}=m\mathbf{a}$ becomes $\sum\mathbf{F}+(-m\mathbf{a})=0$, which has the form of a static equilibrium equation.

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Electrical Engineering QUESTION #2155

Question 3112

In a series RLC circuit, the quality factor $Q$ is defined as the ratio of resonant frequency to bandwidth. If $R = 10\,\Omega$, $L = 100\,\text{mH}$, and $C = 10\,\mu\text{F}$, what is the Q-factor?

$Q = 10$✔️
$Q = \sqrt{10}$
$Q = 1$
$Q = 0.1$

Correct Answer Logic:

Resonant frequency $\omega_0 = \frac{1}{\sqrt{LC}} = \frac{1}{\sqrt{0.1 \times 10^{-5}}} = 1000\,\text{rad/s}$. $Q = \frac{\omega_0 L}{R} = \frac{1000 \times 0.1}{10} = 10$.

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Professional QUESTION #1912

Question 3113

Under Rule 5(1) no important policy decision shall be taken except with whose approval?

The Cabinet
The Minister-in-Charge
The Prime Minister✔️
The Secretary of the Division

Correct Answer Logic:

Rule 5(1) unambiguously provides that no important policy decision shall be taken except with the approval of the Prime Minister.

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Physics QUESTION #1157

Question 3114

The angle of incidence for which polarization is maximum is called:

Scattering angle
Angle of reflection
Polarization angle✔️
None of these

Correct Answer Logic:

The angle of incidence at which reflected light is completely polarized is called the polarization angle or Brewster's angle ($\theta_B$), given by $\tan\theta_B = n$, where $n$ is the refractive index of the denser medium.

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Federal Rules of Evidence (US) QUESTION #3781

Question 3115

A defendant is on trial for a drive-by shooting. A witness testifies she saw the car but couldn't see the driver. The prosecution then offers a recording of a 911 call made by a bystander (who has since died) 30 seconds after the shooting, saying, 'I just saw [Defendant] driving that car!' Is the recording admissible?

No, because it violates the Confrontation Clause.
Yes, as a Present Sense Impression under Rule 803(1).✔️
No, it is hearsay not subject to an exception.
Yes, as a Dying Declaration under Rule 804(b)(2).

Correct Answer Logic:

Rule 803(1) allows statements describing or explaining an event or condition, made while or immediately after the declarant perceived it. 30 seconds after the event usually qualifies. (Note: Crawford/Confrontation Clause issues may exist, but purely under FRE, 803(1) is the fit).

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Electrical Engineering QUESTION #2143

Question 3116

In a power system, the 'Ferranti Effect' occurs when the receiving end voltage $V_r$ is higher than the sending end voltage $V_s$. This is typically observed under which condition?

Full load with lagging power factor
No load or light load on long lines✔️
Short circuit at the receiving end
Heavy inductive loading

Correct Answer Logic:

The Ferranti effect is caused by the charging current of the line (capacitance) when it is energized but lightly loaded, leading to $V_r > V_s$.

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Pharmacokinetics and Pharmacodynamics QUESTION #3829

Question 3117

A paediatric patient weighing $30$ kg is prescribed metronidazole $250$ mg every $8$ hours. Each mL of a $500\ \text{mg}/500\ \text{mL}$ ampoule contains $0.135\ \text{mmol/mL}$ sodium. What is the total sodium intake over $24$ hours?

$33.8$ mmol
$101.3$ mmol✔️
$202.5$ mmol
$1852$ mmol

Correct Answer Logic:

Three doses of $250$ mg each $= 3 \times 250\ \text{mL}$ of the solution. Volume per dose $= 250\ \text{mL}$, total $= 750\ \text{mL}$. Sodium $= 750 \times 0.135 = 101.3\ \text{mmol}$.

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Agronomy QUESTION #2020

Question 3118

In Pakistan's seed multiplication system, which class of seed is produced directly from Breeder seed and is used to produce Registered seed?

Certified seed
Foundation seed✔️
Truthfully Labeled seed
Commercial seed

Correct Answer Logic:

The seed multiplication chain in Pakistan follows: Breeder Seed → Foundation Seed → Registered Seed → Certified Seed. Foundation seed is produced from breeder seed under strict supervision and maintains very high genetic and physical purity standards.

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