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Physics QUESTION #5588

When a potential difference of 5 V is applied across a wire of length 0.1 m, the drift speed of electrons is $2.5 \times 10^{-4}\,\text{m/s}$. If the electron number density in the wire is $8 \times 10^{28}\,\text{m}^{-3}$, the resistivity of the material is closest to:

$1.6 \times 10^{-8}\,\Omega\text{m}$
$1.6 \times 10^{-7}\,\Omega\text{m}$
$1.6 \times 10^{-6}\,\Omega\text{m}$
$1.6 \times 10^{-5}\,\Omega\text{m}$✔️

Correct Answer Logic:

Electric field: $E = \frac{V}{L} = \frac{5}{0.1} = 50\,\text{V/m}$

Current density: $J = nev_d = 8 \times 10^{28} \times 1.6 \times 10^{-19} \times 2.5 \times 10^{-4} = 3.2 \times 10^{6}\,\text{A/m}^2$

Resistivity: $\rho = \frac{E}{J} = \frac{50}{3.2 \times 10^{6}} \approx 1.56 \times 10^{-5}\,\Omega\text{m}$

Closest option: $1.6 \times 10^{-5}\,\Omega\text{m}$. Answer: D.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3161

Question 3802

'Arthritis' is a condition primarily affecting the:

Heart
Lungs
Joints✔️
Skin

Correct Answer Logic:

Arthritis involves inflammation, pain, and stiffness in the joints.

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Security Measures to Maintain Law and Order QUESTION #949

Question 3803

What is 'Cyber Security' in the context of airport order?

Locking the server room
Protecting digital systems and networks✔️
Fixing broken computers
Monitoring staff emails

Correct Answer Logic:

Protecting navigation, communication, and security systems from digital attacks is vital for maintaining airport order.

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Basic Mathematics QUESTION #2831

Question 3804

Simplify: $\dfrac{2^5 \times 4^3}{8^2 \times 2}$

4
8✔️
16
32

Correct Answer Logic:

$2^5 = 32$, $4^3 = (2^2)^3 = 2^6 = 64$, $8^2 = (2^3)^2 = 2^6 = 64$. Numerator $= 2^5 \times 2^6 = 2^{11}$. Denominator $= 2^6 \times 2^1 = 2^7$. Result $= 2^{11-7} = 2^4 = 16$.

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English QUESTION #2745

Question 3805

Identify the ERROR in: 'She is more smarter than her sister.'

She
is
more
smarter✔️

Correct Answer Logic:

'Smarter' is already a comparative adjective. Adding 'more' creates a double comparative, which is grammatically incorrect. It should be either 'smarter' or 'more smart'.

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Physics QUESTION #1189

Question 3806

The Ultraviolet catastrophe means:

The spectral energy concentration towards longer wavelength.
The spectral energy concentration at the middle of the spectrum.
The spectral energy concentration towards shorter wavelength side.✔️
None of these

Correct Answer Logic:

The ultraviolet catastrophe was a prediction of classical physics (Rayleigh-Jeans law) that a blackbody should radiate infinite energy at very short (ultraviolet) wavelengths: $u(\nu) \propto \nu^2 T$. The spectral energy density was predicted to increase without bound towards shorter wavelengths, which was catastrophically wrong and was resolved by Planck's quantum hypothesis.

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Mechanical Engineering QUESTION #2522

Question 3807

For a rigid body in general planar motion, the angular momentum principle about the center of mass G gives:

$\sum M_G = I_G\,\alpha$✔️
$\sum M_G = I_G\,\omega^2$
$\sum M_G = m\,a_G$
$\sum M_G = I_G\,\omega + m v_G r$

Correct Answer Logic:

For a rigid body, the rotational equation about the center of mass G is $\sum M_G = I_G\,\alpha$, where $I_G$ is the mass moment of inertia about G and $\alpha=\dot{\omega}$ is the angular acceleration.

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General Ability and Fire Fighting QUESTION #5597

Question 3808

Class D fires involve which type of fuel?

Cooking fats and oils
Flammable liquids
Combustible metals✔️
Ordinary combustibles

Correct Answer Logic:

Class D fires involve combustible metals such as magnesium and potassium. They require specialized dry powder extinguishing agents.

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Chemistry QUESTION #479

Question 3809

Name the oxide in which N has the highest oxidation number.

Nitrous oxide
Nitric oxide
Nitrogen peroxide
Nitrous anhydride✔️

Correct Answer Logic:

N?O? (nitrous anhydride) has N in +5 state

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Chemistry QUESTION #5568

Question 3810

An organic compound A reacts with $NH_3$ to give B. On heating, B gives C. C reacts with $Br_2$/KOH to give $CH_3CH_2NH_2$ (ethylamine). Identify compound A.

$CH_3COOH$
$CH_3CH_2CH_2COOH$
$CH_3CH(CH_3)COOH$ (2-methylpropanoic acid)
$CH_3CH_2COOH$✔️

Correct Answer Logic:

Working backwards: $CH_3CH_2NH_2$ (ethylamine) is produced by Hofmann bromamide degradation of $CH_3CH_2CONH_2$ (propionamide). Propionamide (C) is produced by heating propanoic acid ammonium salt (B). B is formed when $CH_3CH_2COOH$ (propanoic acid = A) reacts with $NH_3$. So A = $CH_3CH_2COOH$.

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Basic Mathematics QUESTION #4527

Question 3811

If $0 < x < 1$ and $a > 0$, then:

$x^a > x$
$x^a < x$✔️
$x^a = x$
Cannot determine

Correct Answer Logic:

For $0 < x < 1$, raising to positive power makes it smaller. Example: $0.5^2 = 0.25 < 0.5$

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Security Measures to Maintain Law and Order QUESTION #921

Question 3812

In security terms, what does 'situational awareness' involve?

Knowing the employee handbook
Being alert to one's environment✔️
Focusing only on assigned tasks
Following the daily schedule

Correct Answer Logic:

It requires constant monitoring of the environment to detect anomalies or potential security threats early.

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CISA QUESTION #1755

Question 3813

Who is responsible for defining the priorities and objectives reflected in an IT balanced scorecard (BSC)?

Chief Information Officer (CIO)
Chief Financial Officer (CFO)
Chief Executive Officer (CEO)✔️
IT Steering Committee

Correct Answer Logic:

The BSC is designed to reflect the CEO's enterprise-wide vision. IT's scorecard is a subset of the CEO's overall scorecard. The primary objective is to break down departmental silos and align all functions toward a unified cross-functional workflow controlled by the CEO or COO.

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Security Measures to Maintain Law and Order QUESTION #846

Question 3814

Which type of surveillance is most critical for law and order in the "Public Side" of the terminal?

Undercover guards
CCTV Monitoring
Dog squads
All of these✔️

Correct Answer Logic:

A combination of CCTV, K9 units, and plainclothes personnel is used to maintain order in crowded public areas.

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MCQs Section QUESTION #4852

Question 3815

Choose the word nearly opposite in meaning to "CAPTIOUS"

Tolerant✔️
Capable
Winning
Recollected

Correct Answer Logic:

Captious means tending to find fault or raise petty objections. Its antonym is 'tolerant,' meaning willing to accept views and behavior different from one's own without criticism.

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Architecture QUESTION #2369

Question 3816

In the Slope-Deflection Method for analysis of indeterminate beams and frames, the slope-deflection equation for the near-end moment $M_{AB}$ of member $AB$ with near-end rotation $\theta_A$, far-end rotation $\theta_B$, chord rotation $\psi = \Delta/L$, and Fixed-End Moment $FEM_{AB}$ is:

$M_{AB} = \dfrac{2EI}{L}(2\theta_A + \theta_B - 3\psi) + FEM_{AB}$✔️
$M_{AB} = \dfrac{EI}{L}(4\theta_A + 2\theta_B - 6\psi) + FEM_{AB}$
$M_{AB} = \dfrac{2EI}{L}(\theta_A + 2\theta_B - 3\psi) + FEM_{AB}$
$M_{AB} = \dfrac{4EI}{L}(\theta_A - \theta_B) + FEM_{AB}$

Correct Answer Logic:

The slope-deflection equation is $M_{AB} = \dfrac{2EI}{L}(2\theta_A + \theta_B - 3\psi) + FEM_{AB}$, where $\theta_A$ is near-end rotation, $\theta_B$ is far-end rotation, and $\psi = \Delta/L$ is the chord rotation due to relative settlement or sway. The near-end joint rotation carries a coefficient twice that of the far-end (reflecting the carry-over factor of 1/2). The chord rotation term $-3\psi$ accounts for sidesway. This equation is the foundation of the Slope-Deflection Method for all prismatic members.

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Therapeutics and Patient Care QUESTION #3908

Question 3817

Which of the following medications is recommended as a specific treatment for benign prostatic hyperplasia (BPH) by reducing prostate volume?

Spironolactone
Cyproterone acetate
Finasteride✔️
Tibolone

Correct Answer Logic:

Finasteride is a $5\alpha$-reductase inhibitor that reduces dihydrotestosterone (DHT) production, decreasing prostate volume and improving urinary symptoms in BPH.

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Security Measures to Maintain Law and Order QUESTION #939

Question 3818

What is the primary duty of an ASF officer during a fire emergency?

Extinguishing the fire only
Evacuation and crowd management✔️
Guarding the cafeteria
Investigating the cause

Correct Answer Logic:

The priority for the security force is the safe evacuation of people and maintaining order to prevent panic.

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Boilers Mechanical Engineering QUESTION #4027

Question 3819

'Bagging' of a boiler shell occurs when:

The boiler is put in a bag
Localized overheating causes the metal to bulge outward due to internal pressure✔️
The boiler is painted
The operator makes a mistake

Correct Answer Logic:

This is often caused by oil or scale preventing heat transfer at that spot.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3640

Question 3820

Which family does 'Opium' (Afeem) belong to?

Papaveraceae✔️
Solanaceae
Rubiaceae
Liliaceae

Correct Answer Logic:

Papaver somniferum is the Opium poppy.

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