SPSC 25 years Past Papers 2001 to 2025

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SPSC 25 years Past Papers 2001 to 2025

Q511: The total number of independent countries in the world are _____?

دنیا میں آزاد ممالک کی کل تعداد کتنی ہے؟

193

194

195

196

Explanation

The total number of independent countries in the world is 195.

This includes 193 member states of the United Nations.

Plus 2 observer states (the Vatican and Palestine).

Q512: The coordination number of the metal in the complex [Cu(EDTA)]²⁻ is?

Six

Four

Three

None of these

Explanation

The coordination number of the metal in [Cu(EDTA)]²⁻ is six because EDTA (Ethylenediaminetetraacetate) is a hexadentate ligand.

This meaning it can bind to the metal ion through six donor atoms.

Q513: The principle of transformer is _____?

ٹرانسفارمر کا اصول _____ ہے؟

Mutual induction

Ampere's law

Motional e.m.f

None of these

Explanation

A transformer works on the principle of mutual induction, where a changing current in the primary coil induces a voltage in the secondary coil.

This is based on Faraday's Law of Electromagnetic Induction, which states that a changing magnetic field produces an electromotive force (emf).

Q514: Who was the founder of the basic laws of Geometry?

جیومیٹری کے بنیادی قوانین کا بانی کون تھا؟

Pythagoras

Al-Khawarzmi

Jabir bin Hayan

None of these

Explanation

Pythagoras is considered the founder of the basic laws of geometry.

His work, particularly the Pythagorean theorem.

This laid foundational principles for the study of geometry.

Q515: What is the Antonym of "Imp"?

Demon

Angel

Rogue

Pedestrian

Explanation

Imp means چھوٹا شیطان

Angel means فرشتہ

Q516: What is the Square Root of 625?

None of these

Explanation

25*25 = 625

Q517: Ferromagnetic materials are obtained from _____?

فیرومیگنیٹک مواد _____ سے حاصل کیا جاتا ہے؟

Aluminum

Nickel

Copper

None of these

Explanation

Ferromagnetic materials exhibit strong magnetism due to the alignment of magnetic domains.

Nickel (Ni) is a ferromagnetic material, along with iron (Fe) and cobalt (Co), whereas aluminum and copper are non-magnetic.

Q518: There are times when you must decide and take the bull by the horns?

Make a bold decision

Make the right decision

Make the wrong decision

None of these

Explanation

"Take the bull by the horns" means to face a difficult or challenging situation bravely and directly.

Making a bold decision aligns with this meaning, as it involves taking decisive action despite difficulties.

Q519: The Antonym of 'Insolvent' is?

Physically pure

Financially stable

Metaphysically correct

Chemically active

Explanation

Insolvent means دیوالیہ

Financially stable مالی استحکام

Q520: The Synonym of ‘Concession’ is?

Allowance

Refusal

Negligence

Proposal

Explanation

Concession means مراعات

Allowance means مراعات

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