SPSC 25 years Past Papers 2001 to 2025

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SPSC 25 years Past Papers 2001 to 2025

Q761: Dengue fever is a _____?

ڈینگی بخار ایک _____ ہے؟

Water born disease

Arbo-viral disease

Protozoan disease

None of these

Explanation

Dengue fever is caused by the dengue virus, which is transmitted by mosquitoes (arthropods), hence it is an arboviral disease.

It is specifically a viral disease spread by insect vectors.

Q762: Hydrostatic skeleton is found in ______?

ہائیڈروسٹٹک کنکال ______ میں پایا جاتا ہے؟

Earthworm

Crocodile

Fish

None of these

Explanation

A hydrostatic skeleton relies on fluid pressure to maintain shape and movement.

Earthworms use their fluid-filled body cavities to create movement.

Q763: Marine protozoans transferred to fresh will _____?

میرین پروٹوزینز کو تازہ مرضی _____ میں منتقل کیا گیا؟

Enlarge

No change

Shrink

None of these

Explanation

Marine protozoans are adapted to a high-salinity environment.

When transferred to freshwater, osmosis causes water to enter their cells, leading to swelling.

Without proper osmoregulation, excessive water intake may eventually cause the protozoan to burst.

Q764: Teredo also known as shipworm belongs to class _____?

ٹیریڈو بھی شپ کیڑا کے نام سے جانا جاتا ہے کلاس _____ سے ہے؟

Clastropoda

Pelecypoda

Cyclopda

None of these

Explanation

Teredo, commonly known as the shipworm.

It is a type of bivalve mollusk that belongs to the class Pelecypoda (Bivalvia).

It is notorious for boring into and damaging wooden structures submerged in seawater, such as ships and piers.

Q765: Plant use which substances as cheap osmoticum?

پودوں کا استعمال سستے اوسموٹیکم کے طور پر کون سا مادہ ہے؟

Ascorbic acid

Minerals

Proline

None of these

Explanation

Proline acts as a cheap osmoticum.

It helping plants maintain water balance under drought, salinity, and other stress conditions.

It stabilizes proteins, protects membranes, and scavenges reactive oxygen species (ROS).

Q766: A system of government by the wealthy is called _____?

Democracy

Plutocracy

Aristocracy

None of these

Explanation

Plutocracy is a system where power is held by the wealthy individuals or families.

It influencing political and economic decisions based on their financial status.

Q767: The value of lim x → 0 x Sin(15/a) is?

Zero

Infinity

None of these

Explanation

Since $lim_{x to 0} x sin(15/a)$ is of the form $x cdot text{constant}$ , and $x to 0$ , the whole expression tends to 0.

The sine function remains bounded, so multiplying by $x$ (which approaches zero) results in zero.

Q768: He died _____ fever?

From

Explanation

The correct preposition to indicate cause of death due to illness is "of".

He died of fever.

وہ بخار سے مر گیا۔

Q769: In mammals the adipose tissue is found _______?

ستنداریوں میں ایڈیپوز ٹشو _______ پایا جاتا ہے؟

In the dermis

Below the dermis

In the epidermis

None of these

Explanation

Adipose tissue in mammals is located below the dermis in the hypodermis (subcutaneous layer).

It serves as an energy reserve, provides insulation, and cushions the body.

Q770: The primary germ layer that gives rise to digestive glands is ______?

بنیادی جراثیم کی پرت جو ہاضمہ غدود کو جنم دیتی ہے وہ ______ ہے؟

Ectoderm

Endoderm

Mesoderm

None of these

Explanation

Endoderm forms the lining of the digestive tract and its associated glands, such as the liver and pancreas.

It also gives rise to the respiratory system.

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