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$5x - 15 = 2x + 12$. $5x - 2x = 12 + 15$. $3x = 27$. $x = 9$. Wait: $5(9-3)=5\times6=30$ and $2(9+6)=2\times15=30$ ✓. So $x=9$, which is option index 1 (option_2).

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FIA Act QUESTION #9963

Question 5628

The Director General exercises powers analogous to which office under the Police Act, 1861?

Superintendent of Police
Inspector General of Police✔️
Deputy Inspector General
Station House Officer

Correct Answer Logic:

The DG exercises such powers of an Inspector General of Police as may be prescribed by rules.

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Psychology QUESTION #9912

Question 5629

Which of the following is the best example of a primary reinforcer?

Food✔️
Money
Pay check
New clothes

Correct Answer Logic:

A primary reinforcer directly satisfies a biological need without prior learning. Food is the classic example, satisfying the hunger drive immediately. Money, pay checks, and clothes are secondary (conditioned) reinforcers.

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MBBS QUESTION #10229

Question 5630

A patient with chronic kidney disease develops normocytic normochromic anemia. The most direct physiological explanation is:

Reduced erythropoietin production by damaged renal peritubular interstitial cells✔️
Increased splenic sequestration and destruction of red cells
Vitamin B12 malabsorption
Chronic blood loss from the gastrointestinal tract

Correct Answer Logic:

Progressive nephron loss in chronic kidney disease reduces the renal mass responsible for erythropoietin synthesis, leading to inadequate erythropoietic stimulation and normocytic anemia — correctable with recombinant erythropoietin therapy.

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General Knowledge QUESTION #4751

Question 5631

WAFA is the official news agency of which entity?

Syria
Jordan
Egypt
Palestine✔️

Correct Answer Logic:

WAFA (Wakalat Anba'a Falastiniyya) is the official Palestinian news agency, established in 1972 and operating under the Palestinian Authority.

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Physics QUESTION #7083

Question 5632

A solid sphere (radius $r$, bulk modulus $K$) is in a liquid. A mass $m$ is placed on a piston of area $a$ to compress the liquid. Find the fractional decrease in radius $\frac{dr}{r}$.

$\frac{mg}{3Ka}$✔️
$\frac{mg}{Ka}$
$\frac{Ka}{mg}$
$\frac{3Ka}{mg}$

Correct Answer Logic:

Bulk Modulus $K = \frac{\Delta P}{-\Delta V/V}$.

The change in pressure is $\Delta P = \frac{mg}{a}$.
The fractional change in volume for a sphere is $\frac{\Delta V}{V} = 3\frac{dr}{r}$.
$K = \frac{mg/a}{3dr/r} \implies \frac{dr}{r} = \frac{mg}{3Ka}$.

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Islamic Studies QUESTION #645

Question 5633

Dozy is the author of:

The Spirit of Islam
Spanish Islam✔️
History of Saracens
None of these

Correct Answer Logic:

Reinhart Dozy was a famous scholar known for his work Spanish Islam.

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Physics QUESTION #1059

Question 5634

The electric field in a plane EM wave is $E_z=60\cos(5x+1.5\times10^9t)\ \text{V/m}$. The corresponding magnetic field expression is:

$B_z=60\cos(5x+1.5\times10^9t)\ \text{T}$
$B_y=60\sin(5x+1.5\times10^9t)\ \text{T}$
$B_y=2\times10^{-7}\cos(5x+1.5\times10^9t)\ \text{T}$✔️
$B_x=2\times10^{-7}\cos(5x+1.5\times10^9t)\ \text{T}$

Correct Answer Logic:

Amplitude of B: $B_0=\frac{E_0}{c}=\frac{60}{3\times10^8}=2\times10^{-7}\ \text{T}$. Wave travels in $-x$ direction (since $5x+\omega t$). E is in z-direction, wave in $-x$: B must be in y-direction ($\hat{k}\times(-\hat{i})=\hat{j}$... checking: $\vec{E}\times\vec{B}\propto$ direction of propagation $=-\hat{x}$). So $B_y=2\times10^{-7}\cos(5x+1.5\times10^9t)\ \text{T}$.

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Math Physics Chemistry Biology QUESTION #11391

Question 5635

During the menstrual cycle, after the female gamete is released from the ovary in the ovulation, the remains of the ovary is:

FSH
LH
Corpus luteum✔️
Testosterone

Correct Answer Logic:

After ovulation, the ruptured follicle transforms into the corpus luteum ('yellow body'). Under LH stimulation, the corpus luteum secretes progesterone and estrogen to maintain the uterine lining for potential implantation. If fertilization does not occur, the corpus luteum degenerates (corpus albicans) and hormone levels fall, triggering menstruation.

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Physics QUESTION #401

Question 5636

A 2m long pipe is open at both ends. What is its harmonic frequency?

42.5 Hz
85 Hz✔️
220 Hz
None of these

Correct Answer Logic:

For open pipe: f = v/2L = 340/(2?2) = 85 Hz

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Physics QUESTION #7217

Question 5637

The equation of state of a real gas is expressed as $\left(P + \dfrac{a}{V^2}\right)(V - b) = RT$, where $P$ is pressure, $V$ is volume, $T$ is absolute temperature, and $a$, $b$, $R$ are constants. What are the dimensions of the constant $a$?

$[ML^5T^{-2}]$✔️
$[ML^{-1}T^{-2}]$
$[L^3]$
$[L^6]$

Correct Answer Logic:

Since quantities added or subtracted must have the same dimensions, $\dfrac{a}{V^2}$ must have the same dimensions as pressure $P$.

$[P] = [ML^{-1}T^{-2}]$ and $[V^2] = [L^6]$

Therefore: $[a] = [P][V^2] = [ML^{-1}T^{-2}][L^6] = [ML^5T^{-2}]$

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Chemistry QUESTION #7810

Question 5638

Acetic acid can be prepared by hydrolysis of:

Ethanol
Ethene
Methanoic acid
Methyl cyanide✔️

Correct Answer Logic:

Hydrolysis of methyl cyanide (acetonitrile, CH₃CN) yields acetic acid: $\mathrm{CH_3CN + 2H_2O \rightarrow CH_3COOH + NH_3}$.

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The Constitution of Pakistan QUESTION #9377

Question 5639

Article 184 on the Original Jurisdiction of the Supreme Court was omitted by:

The 18th Amendment 2010
The 26th Amendment 2024
The 27th Amendment 2025✔️
The 21st Amendment 2015

Correct Answer Logic:

Article 184, which previously granted the Supreme Court original jurisdiction in certain matters (including suo motu jurisdiction via Article 184(3)), was omitted by the Constitution (Twenty-Seventh Amendment) Act, 2025. Its counterpart jurisdiction was transferred to the newly created Federal Constitutional Court under Articles 175B-175L.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3314

Question 5640

The 'Minimum Inhibitory Concentration' (MIC) is defined as the:

Lowest dose of a drug that kills the patient
Lowest concentration of an antibiotic that prevents visible growth of a microbe✔️
Maximum dose allowed
Concentration of bacteria in a sample

Correct Answer Logic:

MIC is a key measure of the potency of an antimicrobial agent.

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