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Journalism / Mass Communication QUESTION #6401

The persistence of vision principle explains why cinema creates an illusion of continuous motion. At what frame rate do motion picture projectors present images, and how many times is each frame flashed on the screen?

48 frames per second, each flashed once
24 frames per second, each flashed twice✔️
12 frames per second, each flashed four times
60 frames per second, each flashed once

Correct Answer Logic:

The textbook explains the technical basis of cinema's illusion of motion: “Motion picture projectors present images much faster, at 24-frames per-second, with each of those frames flashed on the screen twice. This high speed makes the transition between images virtually invisible.” This means the human eye receives 48 flashes per second (24 frames × 2 flashes each), which is faster than the eye's ability to detect individual frames, creating the perception of smooth, continuous motion. The double-flash of each frame was introduced to reduce flicker — at 24 frames per second with a single flash, the lower light frequency caused visible flickering. Doubling the flash rate with a rotating shutter solved this problem. This 24fps standard was established in the early sound film era and remained the global cinema standard for most of the 20th century. Modern digital cinema can shoot at 48fps or higher.

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Law QUESTION #9522

Question 202

A woman W is a judgment-debtor against whom a decree for recovery of money has been passed. The decree-holder applies for W's arrest in execution. W objects, citing her gender. Should the Court order W's arrest?

Yes; a decree for money can be executed by arrest against anyone
Yes; the prohibition applies only to women in purdah
No; but W can be detained if she is a businesswoman
No; Section 56 CPC absolutely prohibits the Court from ordering the arrest or detention in prison of a woman in execution of a decree for payment of money, regardless of her financial capacity✔️

Correct Answer Logic:

Section 56 CPC contains an absolute prohibition: notwithstanding anything in Part II of the CPC, the Court shall not order the arrest or detention in prison of a woman in execution of a decree for the payment of money. This is an unconditional bar based solely on gender.

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Chemistry QUESTION #5568

Question 203

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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English QUESTION #8487

Question 204

Select the word SIMILAR in meaning to: Cumbersome

Awkward✔️
Decline
Handsome
Beautiful

Correct Answer Logic:

Cumbersome means awkward or difficult to handle.

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General Abilities QUESTION #3970

Question 205

A $132$-inch wire is shaped into various geometric forms. Which of the following shapes will enclose the greatest surface area?

Circle✔️
Square
Regular Hexagon
Equilateral Triangle

Correct Answer Logic:

No explanation provided for this question.

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Electronics QUESTION #3773

Question 206

Identify the process described by the partial differential equation $\frac{\partial \phi}{\partial t} + a \frac{\partial \phi}{\partial x} = 0$, where $a$ is a non-zero constant.

Linear wave propagation✔️
Transient heat conduction
Newton’s law of cooling
Radiative transfer

Correct Answer Logic:

This is the linear advection equation representing a wave moving at speed $a$.

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Chemistry QUESTION #7369

Question 207

A particle moves at 3 times the speed of an electron. If the ratio of de Broglie wavelength of the particle to that of the electron is $1.8 \times 10^{-4}$, the particle is:

Neutron
$\alpha$-particle✔️
Deuteron
Tritium

Correct Answer Logic:

de Broglie wavelength: $\lambda = \dfrac{h}{mv}$

$\dfrac{\lambda_p}{\lambda_e} = \dfrac{m_e v_e}{m_p v_p} = \dfrac{m_e}{m_p \times 3} = 1.8 \times 10^{-4}$

$m_p = \dfrac{m_e}{3 \times 1.8 \times 10^{-4}} = \dfrac{9.1 \times 10^{-31}}{5.4 \times 10^{-4}} \approx 6.68 \times 10^{-27}$ kg

This is approximately 4 times the proton mass, matching the $\alpha$-particle (He nucleus, mass $\approx 4$ u).

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Paper-I (Pharmaceutics II (Industrial and Quality Control) and Pharmaceutics III (Hospital and Community Pharmacy)) QUESTION #5700

Question 208

The 'White's Method' is used in the calculation of which of the following?

Eutectic point
Isotonicity✔️
Body Surface Area
Displacement value

Correct Answer Logic:

White's method is a volume-based method used to adjust the tonicity of pharmaceutical solutions.

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Physics QUESTION #371

Question 209

Which one is most stable element on the basis of binding energy?

Sn
Ba
Kr
Fe✔️

Correct Answer Logic:

Iron (Fe) has the highest binding energy per nucleon

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Logical Reasoning QUESTION #3956

Question 210

The meeting was quite jarring because the serious nature of the subject matter was at odds with the _____ of the speaker's delivery.

uniqueness✔️
rapidity
lightness
precision

Correct Answer Logic:

2

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Accounting & Finance QUESTION #1199

Question 211

When a corporation issues shares above their par value, the excess amount is credited to:

Retained Earnings
Share Premium Account✔️
Capital Account
Revenue Account

Correct Answer Logic:

When shares are issued at a price above par value, the par value portion is credited to the Share Capital account and the excess (premium) is credited to the Share Premium Account (also called Additional Paid-in Capital). This premium is part of equity but is kept separate from retained earnings.

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Chemistry QUESTION #455

Question 212

Which metal is commonly used to remove air bubbles from molten metals?

Aluminium✔️
Copper
Sodium
Calcium

Correct Answer Logic:

Aluminum is used for degassing molten metals

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Islamic Studies QUESTION #337

Question 213

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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Chemistry QUESTION #1422

Question 214

The Nernst equation relates electrode potential to:

Pressure
Temperature and concentration✔️
Surface area
None of these

Correct Answer Logic:

The Nernst equation: $E = E^\circ - \dfrac{RT}{nF}\ln Q$ relates the electrode potential $E$ to the standard electrode potential $E^\circ$, temperature $T$, number of electrons $n$, Faraday constant $F$, and the reaction quotient $Q$ (which depends on concentration). So electrode potential depends on both temperature and concentration of the species involved.

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Islamic Studies QUESTION #7897

Question 215

What is the serial number of the Kalimah Rad-e-Kufr among the 6 Kalimahs?

Six✔️
Four
Three
Five

Correct Answer Logic:

Kalimah Rad-e-Kufr is the 6th (Sixth) Kalimah. The six Kalimahs are: (1) Tayyab, (2) Shahadat, (3) Tamjeed, (4) Tauheed, (5) Astagfar, and (6) Rad-e-Kufr. Kalimah Rad-e-Kufr is a declaration of rejection of disbelief and false deities.

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Islamic Studies QUESTION #8245

Question 216

Which is the longest Surah of Holy Quran?

Surah Al Baqra✔️
Surah Akhlas
Surah Al-Nisa
Surah Al Imran

Correct Answer Logic:

Surah Al-Baqarah (The Cow) is the longest Surah in the Holy Quran with 286 verses (Ayaat). It is the 2nd Surah and was revealed in Medina. The name comes from the story of the cow mentioned in verses 67-73. This Surah covers various topics including faith, laws, stories of previous prophets, and contains Ayat-ul-Kursi (verse 255), which is the greatest verse of the Quran.

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Accounting & Finance QUESTION #6233

Question 217

Which ethical principle prevents an auditor from using client information for personal gain?

Integrity
Professional Behavior
Confidentiality✔️
Due Care

Correct Answer Logic:

Confidentiality dictates that the auditor should not disclose info without permission nor use it for personal benefit.

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Mathematics QUESTION #4109

Question 218

Let $\mathbb{Q}^+$ be the set of positive rational numbers with operation $a * b = \frac{ab}{2}$. What is the identity element $e$ such that $a * e = a$ for all $a \in \mathbb{Q}^+$?

$e = 0$
$e = 1$
$e = 2$✔️
$e = \frac{1}{2}$

Correct Answer Logic:

For identity: $a * e = \frac{ae}{2} = a$, so $ae = 2a$, thus $e = 2$.

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Mathematics QUESTION #4094

Question 219

In applying the Mean Value Theorem to prove $e^x\geq1+x$ for all $x\in\mathbb{R}$, define $g(t)=e^t-1-t$. Then $g'(t)=e^t-1$. For $t>0$, $g'(t)$:

Is negative, so $g$ is decreasing
Is zero, so $g$ is constant
Is positive, so $g$ is increasing, implying $g(x)>g(0)=0$✔️
Is undefined

Correct Answer Logic:

For $t>0$: $g'(t)=e^t-1>0$. So $g$ is strictly increasing for $t>0$, meaning $g(x)>g(0)=0$ for $x>0$, i.e., $e^x-1-x>0$, i.e., $e^x>1+x$. A similar argument with $g$ decreasing for $t<0$ completes the proof for all $x\in\mathbb{R}$.

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Ability / HR / Governance / Special Education QUESTION #1871

Question 220

Vacancies in posts in BPS 1 and 2 shall ordinarily be filled on what basis?

All-Pakistan basis
Provincial basis
Regional basis
Local basis✔️

Correct Answer Logic:

Rule 16 states vacancies in posts in BPS 1 and 2 and equivalent shall ordinarily be filled on local basis.

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