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Spatial redundancy (or inter-pixel redundancy) is reduced by transform coding, which decorrelates the pixels by converting them into frequency coefficients.

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Boilers Mechanical Engineering QUESTION #4071

Question 2065

'Turndown Ratio' of a burner refers to the ratio of:

Max heat output to min heat output✔️
Height to width
Fuel to air
Day to night

Correct Answer Logic:

A burner with $10:1$ turndown can operate at $10\%$ of its full capacity without shutting off.

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Geography QUESTION #1251

Question 2066

'Spatial databases' are also known as:

Geodatabases✔️
Mono-databases
Concurrent databases
None of these

Correct Answer Logic:

Spatial databases (also called geodatabases) are databases optimized to store, query, and manipulate data that represents objects defined in geometric space — particularly geographic features. The term 'geodatabase' is widely used in GIS (especially in ESRI's ArcGIS platform) to describe a database of spatial/geographic data with both location and attribute information.

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Reading and Writing (Module-1) QUESTION #5404

Question 2067

Biologist Valentina Gómez-Bahamón and her team have investigated two subspecies of the fork-tailed flycatcher bird that live in the same region in Colombia, but one subspecies migrates south for part of the year, and the other doesn't. The researchers found that, due to slight differences in feather shape, the feathers of migratory forked-tailed flycatcher males make a sound during flight that is higher pitched than that made by the feathers of nonmigratory males. The researchers hypothesize that fork-tailed flycatcher females are attracted to the specific sound made by the males of their own subspecies, and that over time the females' preference will drive further genetic and anatomical divergence between the subspecies. Which finding, if true, would most directly support Gómez-Bahamón and her team's hypothesis?

The feathers located on the wings of the migratory fork-tailed flycatchers have a narrower shape than those of the nonmigratory birds which allows them to fly long distances.
Over several generations, the sound made by the feathers of migratory male fork-tailed flycatchers grows progressively higher pitched relative to that made by the feathers of nonmigratory males.✔️
Fork-tailed flycatchers communicate different messages to each other depending on whether their feathers create high-pitched or low-pitched sounds.
The breeding habits of the migratory and nonmigratory fork-tailed flycatchers remained generally the same over several generations.

Correct Answer Logic:

If the pitch difference increases over generations, it would support the hypothesis that female preference drives further divergence between the subspecies.

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Administration QUESTION #2937

Question 2068

In the context of Human Resource Management, what is the main goal of a "Job Analysis"?

Setting the specific salary range for a new position
Determining the duties and requirements of a specific job✔️
Conducting a final interview with potential candidates
None of these

Correct Answer Logic:

Job analysis is the systematic process of gathering information about the tasks, responsibilities, and necessary skills for a specific role.

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Mechanical Engineering QUESTION #2388

Question 2069

The standard second-order closed-loop transfer function is written as:

$Y(s) = \frac{2\zeta\omega_n}{s^2+2\zeta\omega_n s+\omega_n^2}$
$Y(s) = \frac{\omega_n^2}{s^2+2\zeta\omega_n s+\omega_n^2}$✔️
$Y(s) = \frac{\omega_n^2}{s^2+\omega_n^2}$
$Y(s) = \frac{1}{s^2+2\zeta s+1}$

Correct Answer Logic:

The standard second-order system: $Y(s)=\frac{\omega_n^2}{s^2+2\zeta\omega_n s+\omega_n^2}$ where $\omega_n$ is the undamped natural frequency and $\zeta$ is the damping ratio. Poles: $s=-\zeta\omega_n\pm\omega_n\sqrt{\zeta^2-1}$.

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Urdu QUESTION #5187

Question 2070

درست ضربِ مثل بتائیں۔

ایک ایک گیارہ
ایک ایک دو بارہ
ایک اور ایک گیارہ✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

درست ضربِ مثل ہے: 'ایک اور ایک گیارہ' یعنی اتحاد سے طاقت بڑھ جاتی ہے۔

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Agronomy QUESTION #2101

Question 2071

Leghemoglobin in legume root nodules serves the critical function of:

Providing carbon skeleton for amide synthesis and nitrogen export to shoots
Maintaining microaerophilic conditions within the infected nodule cells — binding O₂ at high affinity to supply it to bacteroid respiration while keeping free O₂ concentration low enough to protect the oxygen-sensitive nitrogenase enzyme from irreversible inactivation✔️
Transporting fixed nitrogen (as ureides or amides) from nodule to xylem
Synthesizing ATP required for the high energy demand of the nitrogenase reaction

Correct Answer Logic:

Leghemoglobin (a plant-encoded heme protein, heme supplied by bacteroid) maintains the paradox of nodule metabolism: bacteroids need O₂ for ATP production (nitrogenase is highly energy-demanding: 16 ATP/N₂) but nitrogenase is irreversibly destroyed by O₂. Leghemoglobin buffers O₂ at ~10⁻⁸ M (vs atmospheric ~0.2 mM), supplying O₂ for respiration while keeping free O₂ below inhibitory levels — the pink nodule color indicates active BNF.

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Basic Mathematics QUESTION #2864

Question 2072

The diameter of a circle is 20 cm. Find the circumference. (Take $\pi = 3.14$)

62.8 cm✔️
64.4 cm
66.2 cm
68.4 cm

Correct Answer Logic:

Circumference $= \pi d = 3.14 \times 20 = 62.8$ cm.

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Child Health QUESTION #3925

Question 2073

A term infant is delivered via ventouse assistance with light meconium-stained fluid. The baby is slow to initiate breathing, with Apgar scores of $3$ at $1$ minute, $5$ at $5$ minutes, and $9$ at $10$ minutes. Which step is most crucial for successful neonatal resuscitation?

Suctioning of the mouth and nose✔️
Insertion of a Guedel airway
Establishing adequate ventilation
Administration of supplemental oxygen

Correct Answer Logic:

2

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Urdu QUESTION #5257

Question 2074

بانگِ درا کتنے ادوار پر مشتمل ہے؟

ایک
دو
تین✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

بانگِ درا تین ادوار پر مشتمل ہے: پہلا دور (بچپن)، دوسرا دور (جوانی) اور تیسرا دور (پختگی) (آپشن 2 پر تین ہے)۔

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Boilers Mechanical Engineering QUESTION #4004

Question 2075

When performing a Hydraulic Test, why is 'Air' removed from the boiler completely?

Air is too expensive
Compressed air stores massive energy and can cause an explosion if the boiler fails✔️
Air makes the water turn green
Air helps the boiler to float

Correct Answer Logic:

Water is incompressible; if the vessel ruptures during a hydrotest, there is no 'blast' like there would be with air/steam.

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Agronomy QUESTION #2019

Question 2076

Seed certification ensures that:

Seeds are chemically treated with fungicides before packaging
Varieties maintain their genetic identity, physical purity, and germination standards through a regulated multiplication chain✔️
Seeds are produced exclusively on government farms
All certified seeds are hybrid and thus superior to open-pollinated varieties

Correct Answer Logic:

Seed certification is a quality assurance system that verifies genetic purity (true-to-type), physical purity, germination percentage, moisture content, and freedom from seed-borne diseases. It governs the multiplication chain: Breeder → Foundation → Registered → Certified seed.

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General Knowledge QUESTION #2594

Question 2077

A group of 8 bits is known as:

A Kilobyte
A Nibble
A Byte✔️
A Megabit

Correct Answer Logic:

A byte is a group of 8 bits. It is the fundamental unit of digital data storage. All larger units — kilobytes, megabytes, gigabytes — are multiples of bytes. A single character like the letter 'A' typically requires 1 byte to store.

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Biology QUESTION #529

Question 2078

Name the vertebrates which are without jaws.

Osteichthyes
Cyclostomata✔️
Chondrichthyes
None of these

Correct Answer Logic:

Cyclostomata (lampreys, hagfish) are jawless

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3269

Question 2079

'Spirometry' is a clinical test used to measure:

Blood pressure
Lung volumes and capacities✔️
Heart rhythm
Nerve conduction

Correct Answer Logic:

It helps diagnose asthma and COPD.

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Biology Zoology Botany QUESTION #1376

Question 2080

Which of the following is the dominant generation in the life cycle of Pteridophytes?

Sporophyte✔️
Gametophyte
Seedling
Embryo

Correct Answer Logic:

In pteridophytes (ferns and allies), the sporophyte generation (diploid, 2n) is the dominant, independent, and conspicuous phase — the familiar leafy fern plant. The gametophyte (haploid, n) is a small, inconspicuous, short-lived prothallus. This contrasts with bryophytes where the gametophyte is dominant, and represents an evolutionary advancement.

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