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Science MCQs

🔬 Explore Science MCQs! Test knowledge on Biology, Chemistry, Physics, Astronomy, Earth Science & General Science. Free quizzes at TheQuizWire.
287 Total Questions
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Science Study Guide: Essential Concepts for CSS & Competitive Exams

Master General Science for CSS, PMS, and US/UK competitive exams. Explore physics, chemistry, biology, and astronomy facts to excel in your next recruitment test.

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#1
By Kalsoom Tahir
Hard
Fact Checked
06 Aug 2026
Which vitamin serves as the essential precursor for the synthesis of the coenzyme Flavin Adenine Dinucleotide (FAD)?
#2
By Rabia Anum
Medium
Fact Checked
05 Jun 2026
Why are lightweight objects near a fast-moving train pulled toward it as it passes?
#3
By Kalsoom Tahir
Easy
Fact Checked
03 Jun 2026
A red blood cell placed in a highly concentrated salt solution will shrink due to which biological process?
#4
By Ahmed Akber
Easy
Fact Checked
03 Jun 2026
What does an observer on Earth see when looking at a star located 100 light-years away?
#5
By Kalsoom Tahir
Medium
Fact Checked
07 May 2026
Which process involves the conversion of atmospheric nitrogen into ammonia by specialized soil bacteria?
#6
By Ahmed Akber
Hard
Fact Checked
09 Apr 2026
In the photoelectric effect, if the frequency of incident radiation exceeds the threshold but intensity is constant, increasing frequency results in:
#7
By Kalsoom Tahir
Medium
Fact Checked
08 Apr 2026
Which property of water ensures that lakes freeze from the surface downwards, protecting aquatic life in sub-zero temperatures?
#8
By Ahmed Akber
Medium
Fact Checked
07 Apr 2026
Which layer of the Earth’s interior accounts for approximately 84 percent of the planet’s total volume?
#9
By Ahmed Akber
Hard
Fact Checked
06 Apr 2026
Which condition must be met for a chemical reaction to be spontaneous at all temperatures?
#10
By Rabia Anum
Hard
Fact Checked
05 Apr 2026
In cellular respiration, how does the movement of protons across the inner mitochondrial membrane result in ATP production?

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Our Science MCQs section covers the vast spectrum of scientific inquiry, from the intricacies of Biology and Chemistry to the grand scales of Physics, Astronomy, and Earth Science. While you conduct your experiments in knowledge here, remember TheQuizWire.com explores a wide range of global subjects daily. You can also challenge yourself with quizzes related to:

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