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Taking torques about the contact point on the floor. The angle with the wall is $60°$, so angle with floor is $30°$. Normal from wall (horizontal) $\times L\sin30° = mg\times\frac{L}{2}\cos30°$. Wait — using torque about foot: $N_w\cdot L\sin30° = mg\cdot\frac{L}{2}\cos30°\Rightarrow N_w = \frac{mg\cos30°}{2\sin30°} = \frac{20\times10\times\frac{\sqrt{3}}{2}}{2\times\frac{1}{2}}=100\sqrt{3}$. Friction $= N_w = 100\sqrt{3}\approx173\ \text{N}$. Answer: $100\sqrt{3}\ \text{N}$.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3601

Question 324

'Clove' (Eugenia caryophyllus) is used in dentistry as a local anesthetic due to its high content of:

Menthol
Eugenol✔️
Thymol
Limonene

Correct Answer Logic:

Eugenol provides the characteristic smell and numbing effect of clove oil.

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Others section QUESTION #4784

Question 325

Which province in Afghanistan is the largest opium-producing region?

Helmand✔️
Nangarhar
Badakhshan
Kandahar

Correct Answer Logic:

Helmand province in southern Afghanistan is consistently the world's largest single source of illicit opium, accounting for a significant portion of Afghanistan's total opium production.

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Others section QUESTION #4785

Question 326

Silk Air is an airline based in which country?

Sri Lanka
Switzerland
Singapore✔️
Thailand

Correct Answer Logic:

Silk Air was a regional airline and a wholly owned subsidiary of Singapore Airlines, headquartered in Singapore. It was merged into Singapore Airlines in 2021.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3001

Question 327

A 'Gargle' is usually supplied as a:

Concentrated solution to be diluted✔️
Ready-to-use thick syrup
Sterile injection
Topical powder

Correct Answer Logic:

Gargles are typically concentrated aqueous solutions meant to be diluted with warm water before use.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #2988

Question 328

How many micrograms ($\mu\text{g}$) are in $0.5\text{ milligrams}$ ($mg$)?

$50\text{ }\mu\text{g}$
$500\text{ }\mu\text{g}$✔️
$5000\text{ }\mu\text{g}$
$0.0005\text{ }\mu\text{g}$

Correct Answer Logic:

$1\text{ mg} = 1000\text{ }\mu\text{g}$, so $0.5\text{ mg} = 500\text{ }\mu\text{g}$.

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Mathematics QUESTION #1268

Question 329

The graph of $r = 2\cos\theta$ in Cartesian coordinates is:

A parabola
A circle of radius 2 centred at origin
A circle of radius 1 centred at $(1,0)$✔️
A line through the origin

Correct Answer Logic:

Multiply both sides by $r$: $r^2=2r\cos\theta\Rightarrow x^2+y^2=2x\Rightarrow (x-1)^2+y^2=1$. This is a circle of radius $1$ centred at $(1,0)$.

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Physics QUESTION #1058

Question 330

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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Islamic Studies QUESTION #337

Question 331

How many Surahs in the Quran are named after Prophets?

3
4
5
6✔️

Correct Answer Logic:

The Surahs are: Yunus, Hud, Yusuf, Ibrahim, Nuh, and Muhammad (Peace be upon them).

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Security Measures to Maintain Law and Order QUESTION #924

Question 332

What defines an 'Emergency Response Plan' (ERP)?

A list of staff birthdays
Procedures for responding to crises✔️
A financial budget
A passenger flight schedule

Correct Answer Logic:

An ERP outlines specific, coordinated steps to take during fires, attacks, or natural disasters.

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Mechanical Engineering QUESTION #2493

Question 333

In the dynamic equilibrium (D'Alembert) formulation for a rigid body in planar motion, the inertia moment $M_{in}$ about the center of mass C is:

$M_{in} = I_C\alpha$
$M_{in} = -I_C\alpha$✔️
$M_{in} = -m|\mathbf{a}_C|$
$M_{in} = I_C\omega^2$

Correct Answer Logic:

The inertia moment is $M_{in}=-I_C\alpha$, where $I_C$ is the mass moment of inertia about the center of mass and $\alpha$ is the angular acceleration.

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Mechanical Engineering QUESTION #2394

Question 334

The gain margin (GM) of a control system is defined as:

$GM = 1/|Y_1(j\omega_{pc})|$ where $\omega_{pc}$ is the phase crossover frequency (where phase $= -180°$)✔️
$GM = |Y_1(j\omega_{gc})|$ where $\omega_{gc}$ is the gain crossover frequency
$GM = \angle Y_1(j\omega_{gc})$
The maximum gain before the system becomes underdamped

Correct Answer Logic:

Gain margin: $GM=1/|Y_1(j\omega_{pc})|$ where $\omega_{pc}$ is the phase crossover frequency ($\angle Y_1=-180°$). In dB: $GM(dB)=-20\log|Y_1(j\omega_{pc})|$. GM indicates how much the gain can be increased before instability. Typically $GM\geq6$ dB is desired.

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Biology Zoology Botany QUESTION #1368

Question 335

The process of transcription involves the synthesis of:

RNA from DNA✔️
Protein from RNA
DNA from RNA
RNA from protein

Correct Answer Logic:

Transcription is the process by which a segment of DNA is used as a template to synthesise a complementary RNA molecule (specifically mRNA) by the enzyme RNA polymerase. The central dogma of molecular biology is: DNA → (transcription) → RNA → (translation) → Protein. DNA from RNA would be reverse transcription.

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