SPSC 25 YEARS PAST PAPERS 2001 TO 2026
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
- 8
- 5
- 10
- None of these
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Explanation
pH is calculated as pH = -log[H⁺].Given [H⁺] = 1 × 10⁻⁸, so pH = 8.
- 1.53 g/L
- 1.63 g/L
- 1.43 g/L
- None of these
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Explanation
Density = Molar Mass / Molar VolumeUsing the given values:
Molar Mass = 32 g/mol
Molar Volume = 22.4 L
Density = 32 g/mol / 22.4 L = 1.43 g/L
So, the correct calculation is the first one: 32 / 22.4 = 1.43 g/L.
جب ایتھنامائڈ کا علاج فاسفورس پینٹ آکسائیڈ کے ساتھ کیا جاتا ہے؟
- Ammonium phosphate
- Methyl cyanide
- Carbamide
- None of these
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Explanation
When ethanamide (CH3CONH2) reacts with phosphorus pentoxide (P₂O₅), it undergoes dehydration to form methyl cyanide (CH3CN).It is also known as acetonitrile.P₂O₅ acts as a strong dehydrating agent, removing water from ethanamide.
محوری لمبائی اور کرسٹل کے یونٹ سیل کے بین محوری زاویوں کو _____ کے نام سے جانا جاتا ہے؟
- Crystal system
- Coordination number
- Lattice constants
- None of these
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Explanation
Lattice constants define the dimensions and angles of a unit cell in a crystal structure.They determine the geometry and symmetry of a crystalline solid.
- √l(l + 1) h/2π
- √l(l + 2) h/2π
- √l(l + 3) h/2π
- None of these
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Explanation
In Schrödinger wave mechanics, angular momentum is quantized as L = √l(l + 1) h/2π, where l is the azimuthal quantum number.This differs from Bohr's model, which assumes L = nh/2π without considering quantum wave behavior.
- A nail for a nail
- A life for a life
- An eye for an eye
- None of these
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Explanation
"A tooth for a tooth and an eye for an eye" is the complete phrase.
It means to retaliate with an equal punishment for a wrong done to you.
ویکیوم پمپ _____ کے ذریعہ ایجاد ہوا تھا؟
- Otto von Guericke
- Blaise Pascal
- Evangelista Torricelli
- None of these
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Explanation
Otto von Guericke invented the vacuum pump in the 17th century.He demonstrated its power through the famous Magdeburg hemispheres experiment.
اورنگزیب کے دور میں ، مندرجہ ذیل میں سے کون سا حکومت میں شامل نہیں تھا؟
- Pathans
- Marhattas
- Rajputs
- None of these
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Explanation
During the Aurangazeb's reign, Marathas were not included in his government.
During his reign, the Mughal Empire extended from the Himalayas to Karnataka and Gujarat to Bengal.
However he faced lot of rebels from the Jat, Maratha as well as Sikh community.
- Reverberate
- Riverberate
- Riverbrate
- None of these
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Explanation
Reverberate means گونجنا ۔ صدا پیدا کرنا
پلاسی کی لڑائی کے بعد بنگال کے نواب کے طور پر سراج الدولا کو کس نے کامیاب کیا؟
- Aliwardi Khan
- Mir Qasim
- Mir Jafar
- None of these
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Explanation
After the Battle of Plassey in 1757, Mir Jafar was installed as the Nawab of Bengal by the British East India Company.
War of Plassey was fought on 23 June 1757.
This war was fought between Lord Clive and Nawab Siraj-ud-Daula.
