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Physics QUESTION #6995

A parallel plate capacitor of capacitance 12 pF is charged to 10 V and then disconnected from the battery. A porcelain slab of dielectric constant 6.5 is slipped between the plates. What is the work done by the capacitor on the slab?

692 pJ
508 pJ✔️
560 pJ
600 pJ

Correct Answer Logic:

Since the battery is disconnected, charge $Q$ is constant:

$Q = C_0 V_0 = 12 \times 10^{-12} \times 10 = 120\ \text{pC}$

Initial energy: $U_i = \frac{Q^2}{2C_0} = \frac{(120\times10^{-12})^2}{2\times12\times10^{-12}} = 600\ \text{pJ}$

New capacitance: $C = KC_0 = 6.5 \times 12 = 78\ \text{pF}$

Final energy: $U_f = \frac{Q^2}{2C} = \frac{(120)^2 \times 10^{-24}}{2\times78\times10^{-12}} \approx 92.3\ \text{pJ}$

Work done by capacitor on slab $= U_i - U_f = 600 - 92.3 \approx 508\ \text{pJ}$

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Law QUESTION #9679

Question 782

Under Article 37, a confession made by an accused person is irrelevant in criminal proceedings if it was caused by inducement, threat or promise — from whom must such inducement come?

Any person
A co-accused
A person in authority✔️
A police officer only

Correct Answer Logic:

Article 37 specifies that the inducement, threat or promise must proceed from 'a person in authority' and must be sufficient in the Court's opinion to give the accused reasonable grounds for making the confession.

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Pakistan Affairs QUESTION #9047

Question 783

The appointment of the Chief Justice of Pakistan is made by:

The Prime Minister
The President✔️
The Supreme Judicial Council
Parliament

Correct Answer Logic:

The President appoints the Chief Justice on the advice of the Prime Minister.

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Maths QUESTION #2888

Question 784

The sum of two numbers is 25 and their difference is 7. Find the larger number.

14
16✔️
18
20

Correct Answer Logic:

Let numbers be $x, y$. $x+y=25$ and $x-y=7$. Adding gives $2x=32 \implies x=16$.

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Islamic Studies QUESTION #7925

Question 785

What is the oldest Mosque on the Earth?

Ka'aba Bait Ullah✔️
Masjid-i-Zarrar
Masjid-i-Nabvi
Masjid-i-Aqsa

Correct Answer Logic:

Ka'aba Bait Ullah is the oldest mosque on Earth. It was originally built by Prophet Adam (AS), then rebuilt by Prophet Ibrahim (AS) and his son Prophet Ismail (AS) around 2000 BCE. It is the holiest site in Islam and the direction (Qibla) Muslims face during prayer worldwide.

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English QUESTION #8463

Question 786

Regular exercise is beneficial _______ health.

with
for
to✔️
of

Correct Answer Logic:

'Beneficial to' is the correct preposition.

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Biology Zoology Botany QUESTION #1377

Question 787

Which organelle is involved in modifying, sorting, and packaging proteins for secretion?

Endoplasmic reticulum
Golgi apparatus✔️
Lysosome
Peroxisome

Correct Answer Logic:

The Golgi apparatus (Golgi complex) is the cell's main processing and distribution centre for proteins and lipids. Proteins synthesised in the rough endoplasmic reticulum are transported to the Golgi where they are modified (glycosylation, phosphorylation), sorted, and packaged into vesicles for secretion, delivery to lysosomes, or incorporation into the plasma membrane.

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Education QUESTION #7564

Question 788

The Council of Technical Education was recommended to be established under which policy or commission?

Education conference 1947
National Education commission 1959✔️
National education policy 1970
National education policy 1972

Correct Answer Logic:

The National Education Commission of 1959 (also known as the Commission on National Education) recommended the establishment of a Council of Technical Education to promote technical and vocational training.

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Physics and Math QUESTION #781

Question 789

$\sinh^2 x + \cosh^2 x = ?$

$\cosh 2x$✔️
$\cosh x$
$\sinh 2x$
None

Correct Answer Logic:

Using hyperbolic identities: $\cosh^2 x + \sinh^2 x = \cosh 2x$.

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General Knowledge QUESTION #179

Question 790

The G20 Summit meeting was held in _______ in 2024.

Costa Rica
Rio de Janeiro✔️
Tokyo
None of these

Correct Answer Logic:

Brazil hosted the 2024 G20 summit in Rio de Janeiro.

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English QUESTION #8339

Question 791

Tick the synonym: To introduce ideas (instil/inspire/invigorate/impress) — choose the best match.

instil✔️
Inspire
Invigorate
Impress

Correct Answer Logic:

'Instil' means to gradually introduce ideas.

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MCQs Section QUESTION #4859

Question 792

Choose the correct synonym of "GROTTO"

Statue
Cavern✔️
Neighbourhood
Type of moth

Correct Answer Logic:

A grotto is a small picturesque cave or an artificial ornamental cave. Cavern is its closest synonym, both referring to a cave-like structure.

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English QUESTION #8531

Question 793

The synonym of 'Hypothetical' is:

Speculative✔️
Variable
Real
Assembling

Correct Answer Logic:

Hypothetical means based on speculation or assumption.

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Pakistan Affairs QUESTION #602

Question 794

The Third Battle of Panipat (1761) was fought between Ahmad Shah Abdali and:

The Mughals
The Marhattas✔️
The British
None of These

Correct Answer Logic:

The battle was a major conflict between the Durrani Empire and the Maratha Empire.

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MCQs Section QUESTION #5139

Question 795

فردوسِ بریں کس ادیب کا مشہور تاریخی ناول ہے؟

صادق الخیری
ضیا شنکر نسیم
نذیر احمد
عبدالحلیم شرر✔️

Correct Answer Logic:

فردوسِ بریں عبدالحلیم شرر کا مشہور تاریخی ناول ہے جو فرقہ باطنیہ کے موضوع پر لکھا گیا۔

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Chemistry QUESTION #1428

Question 796

Fugacity is used to measure:

Real gas behavior✔️
Ideal gas compressibility
Equilibrium constant
None of these

Correct Answer Logic:

Fugacity is a thermodynamic property introduced by G.N. Lewis to describe the effective pressure of a real gas — it accounts for non-ideal behaviour. For an ideal gas, fugacity equals pressure, but for real gases it deviates due to intermolecular interactions. It is used in place of pressure in thermodynamic equations (like chemical potential) when dealing with real gases.

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Math Physics Chemistry Biology QUESTION #11301

Question 797

Which effect is produced by a pair of genes located at the same locus in a chromosome, but one gene masks the effect of the other?

Epistasis
Dominance✔️
Recessiveness
Complementary

Correct Answer Logic:

Dominance is the effect where one allele masks the effect of another at the same locus.

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Security Measures to Maintain Law and Order QUESTION #866

Question 798

The ultimate goal of combining "Security Measures" with "Ethics" is to ensure:

Total fear
Public Trust and Safety✔️
Faster boarding
Higher fines

Correct Answer Logic:

Effective law and order are only sustainable if the public trusts that security measures are applied fairly, legally, and ethically.

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Accounting & Finance QUESTION #1220

Question 799

A progressive tax system is one where:

Marginal tax rates are high
Higher income taxpayers pay more taxes than do lower income taxpayers.
Marginal tax rates are low.
Higher income taxpayers pay a greater percentage of their income in taxes than do lower income taxpayers.✔️

Correct Answer Logic:

A progressive tax system is one where the tax rate increases as taxable income increases — higher earners pay a larger percentage (not just a larger amount) of their income in taxes. Option (B) is also partially true but less precise; any tax (even flat) means higher earners pay more in absolute terms. Option (D) is the precise definition of a progressive system.

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Verbal Reasoning QUESTION #8174

Question 800

Given that $st = \sqrt{10}$, compare:

Quantity A: $s^2$

Quantity B: $\dfrac{10}{t^2}$

Quantity A is greater
Quantity B is greater
The two quantities are equal✔️
The relationship cannot be determined from the information given

Correct Answer Logic:

From $st = \sqrt{10}$, squaring both sides: $(st)^2 = 10$, so $s^2 t^2 = 10$.

Therefore $s^2 = \dfrac{10}{t^2}$.

Quantity A $= s^2 = \dfrac{10}{t^2} =$ Quantity B.

The two quantities are equal.

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