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Epinephrine causes local vasoconstriction, thereby reducing blood flow to the injection site. This slows systemic absorption of the local anaesthetic, prolonging its duration of action and reducing toxicity.

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English QUESTION #8341

Question 4

Tick the synonym: To disfigure (Efface/Deface/Face/Beauty)

Efface
Deface✔️
Face
Beauty

Correct Answer Logic:

'Deface' means to spoil the appearance of.

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Boilers Mechanical Engineering QUESTION #4062

Question 5

'Handholes' are smaller openings used for:

Inspection of headers and smaller areas where a man cannot enter✔️
Waving at people
Pouring fuel
Letting in birds

Correct Answer Logic:

Essential for cleaning out sludge from the bottom of headers.

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Academic/Professional (Social Sciences) QUESTION #6490

Question 6

The 'Looking Glass Self' is a concept developed by which sociologist?

George Herbert Mead
Charles Horton Cooley✔️
Erving Goffman
Robert Merton

Correct Answer Logic:

Cooley proposed that our self-image is shaped by how we perceive others see us.

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Electrical Engineering QUESTION #2155

Question 7

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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Boilers Mechanical Engineering QUESTION #2529

Question 8

For a rigid body rotating about a FIXED axis, the relationship between the velocity of a point P at position vector $\mathbf{r}$ from the axis is:

$\mathbf{v}_P = \boldsymbol{\omega}\cdot\mathbf{r}$
$\mathbf{v}_P = \boldsymbol{\omega}\times\mathbf{r}$✔️
$\mathbf{v}_P = \boldsymbol{\alpha}\times\mathbf{r}$
$\mathbf{v}_P = \omega^2\mathbf{r}$

Correct Answer Logic:

For rotation about a fixed axis, velocity of any point is $\mathbf{v}=\boldsymbol{\omega}\times\mathbf{r}$, with magnitude $v=\omega r$.

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Dairy Food Science and Technology QUESTION #5928

Question 9

Casein micelles in milk are stabilized against aggregation primarily by:

Van der Waals attraction forces
Steric stabilization by the $\kappa$-casein 'hairy layer' and electrostatic repulsion (negative surface charge, zeta potential $\approx -20\;\text{mV}$)✔️
Hydrophobic bonding to fat globule membranes
Disulfide bonds between $\beta$-casein molecules

Correct Answer Logic:

Casein micelle stability depends on: steric repulsion from the protruding GMP portion of $\kappa$-casein on the micelle surface; and electrostatic repulsion due to negative surface charge (zeta potential $\approx -20\;\text{mV}$ at milk $\text{pH}$). Removal of either causes aggregation.

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Boilers Mechanical Engineering QUESTION #4060

Question 10

'Non-Destructive Testing' (NDT) includes methods like:

Breaking the boiler with a hammer
Ultrasonic, X-ray, and Dye-penetrant testing✔️
Operating the boiler until it fails
Painting the boiler

Correct Answer Logic:

NDT allows inspection of welds and metal thickness without damaging the component.

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Physics QUESTION #7221

Question 11

The dimensional formula of torque is:

$[ML^2L^{-3}]$
$[ML^{-1}T^{-1}]$
$[ML^2T^{-2}]$✔️
$[ML^{-2}]$

Correct Answer Logic:

Torque $\tau = r \times F$ (moment of force)

$[\tau] = [r][F] = L \times MLT^{-2} = ML^2T^{-2}$

Note: Torque has the same dimensional formula as energy ($ML^2T^{-2}$), but they are physically different quantities. Torque is a vector while energy is a scalar.

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Urdu QUESTION #5191

Question 12

درست محاورہ بتائیں؟

ٹانگ ٹانگے مارنا
ناچ نہ جانے آنگن ٹیڑھا✔️
تارے دکھائی دینا
ان میں سے کوئی نہیں

Correct Answer Logic:

صحیح ضربِ مثل ہے: 'ناچ نہ جانے آنگن ٹیڑھا' یعنی اپنی غلطی کو چھپانے کے لیے بہانہ ڈھونڈنا۔

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General Science and Ability QUESTION #259

Question 13

In dementia a person:

Loses weight
Loses thinking and writing
Loses thinking, remembering, and reasoning✔️
All of these

Correct Answer Logic:

Dementia is a decline in mental ability severe enough to interfere with daily life.+2

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Islamic Studies QUESTION #357

Question 14

"Ghazwa e Mouta" was fought in:

6 AH
7 AH
8 AH✔️
10 AH

Correct Answer Logic:

The Battle of Mu'tah took place in September 629 AD, which corresponds to 8 AH.+1

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Boilers Mechanical Engineering QUESTION #4064

Question 15

'Hydro-pneumatic' systems use a combination of:

Oil and Water
Air and Water pressure✔️
Steam and Electricity
Wind and Solar

Correct Answer Logic:

Often used for surge tanks and maintaining steady pressure.

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Mathematics QUESTION #4158

Question 16

For the Laplace equation $u_{xx} + u_{yy} = 0$ on $0 < x < a$, $0 < y < b$ with $u(0,y) = u(a,y) = u(x,0) = 0$ and $u(x,b) = f(x)$, what is the general form of solution using separation of variables?

$u(x,y) = \sum_{n=1}^{\infty} B_n \sin(\frac{n\pi x}{a})\sinh(\frac{n\pi y}{a})$✔️
$u(x,y) = \sum_{n=1}^{\infty} B_n \cos(\frac{n\pi x}{a})\cosh(\frac{n\pi y}{a})$
$u(x,y) = \sum_{n=1}^{\infty} B_n \sin(\frac{n\pi x}{a})\cos(\frac{n\pi y}{b})$
$u(x,y) = \sum_{n=1}^{\infty} B_n e^{\frac{n\pi x}{a}}\sin(\frac{n\pi y}{b})$

Correct Answer Logic:

Boundary conditions $u(0,y) = u(a,y) = 0$ suggest $X(x) = \sin(\frac{n\pi x}{a})$. Condition $u(x,0) = 0$ gives $Y(0) = 0$, so $Y(y) = \sinh(\frac{n\pi y}{a})$.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3020

Question 17

Which base is used for 'Hydrophilic Ointment USP'?

White Petrolatum
Water-removable base✔️
Polyethylene Glycol
Anhydrous Lanolin

Correct Answer Logic:

Hydrophilic Ointment is a water-removable (O/W) emulsion base.

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Chemistry QUESTION #4343

Question 18

Chlorination of benzene in the presence of iron(III) chloride involves mechanism of:

Electrophilic addition
Electrophilic Substitution✔️
Free radical Substitution
Free radical halogenation

Correct Answer Logic:

Benzene undergoes electrophilic aromatic substitution (EAS). $FeCl_3$ acts as a Lewis acid catalyst, generating the electrophile $Cl^+$ from $Cl_2$, which then attacks the benzene ring.

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