SPSC 25 years Past Papers 2001 to 2025

Q1751: Which one of the following is more energetic?

مندرجہ ذیل میں سے کون سا زیادہ توانائی بخش ہے؟

4f

4d

4s

None of these

Q1752: The most suitable temperature for the moderate drying of the solid substance is ______?

ٹھوس مادہ کے اعتدال پسند خشک ہونے کے لئے سب سے موزوں درجہ حرارت ______ ہے؟

120°C

220°C

320°C

None of these

Q1753: The major reason that phenol is a better Bronsted acid than cyclohexanol is _____?

فینول سائکلوہیکسنول سے بہتر برونسٹڈ ایسڈ ہے جس کی بڑی وجہ _____ ہے؟

It is a better proton donor

The phenyl group is an electron withdrawing group by induction, which stabilizes the action formed in the reaction

Phenol is able to stabilize the anion formed in the reaction by resonance

None of these

Q1754: Why is oxygen-hydrogen absorption of CH3OH such a broad band in the infrared?

Hydrogen bonding broadens the absorption

Resonance broaden the absorption

Hyperconjugation resonance broadens

Rotational energy

Q1755: In BH3 molecule H-B-H bond angle is 120°. What kind of hybridization is likely?

sp^3 d

sp^3

sp^2

None of these

Q1756: The organic nutrient with the highest calorific value is ______?

سب سے زیادہ کیلوری کی قیمت کے ساتھ نامیاتی غذائی اجزاء ______ ہے؟

Protein

Sugar

Fat

None of these

Q1757: Methane is slightly soluble in water due to its ______?

کی وجہ سے میتھین پانی میں قدرے گھلنشیل ہے؟ _____

Ionic nature

Polar nature

Non-polar nature

None of these

Q1758: Y = √x-1 is?

Explicit function

Even function

Implicit function

None of these

Explanation

A function is explicit if it is solved for $y$ in terms of $x$ , meaning $y$ is expressed directly as a function of $x$ .

Since $Y = sqrt{x} - 1$ is explicitly written in terms of $x$ , it is an explicit function.

Q1759: Which of the following is a good conductor of heat but a bad conductor of electricity?

مندرجہ ذیل میں سے کون سا گرمی کا ایک اچھا موصل لیکن بجلی کا برا کنڈکٹر ہے؟

Mica

Celluloid

Rubber

None of these

Q1760: Identify as to who was the Prime Minister of Pakistan only for one day?

شناخت کریں کہ صرف ایک دن کے لئے پاکستان کے وزیر اعظم کون تھے؟

General Muhammad Ayub Khan

Hussain Shaheed Suhrawardy

I.I. Chundrigar

None of these