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Science MCQs

🔬 Explore Science MCQs! Test knowledge on Biology, Chemistry, Physics, Astronomy, Earth Science & General Science. Free quizzes at TheQuizWire.
276 Total Questions
88 Topics Available

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#1
By Zain
Medium
Fact Checked
06 Mar 2026
Where in the chloroplast do the light-independent reactions (Calvin cycle) of photosynthesis occur?
#2
By Zain
Medium
Fact Checked
04 Mar 2026
How does a catalyst primarily increase the rate of a chemical reaction?
#3
By Zain
Hard
Fact Checked
04 Mar 2026
Why does the temperature of a gas decrease when it undergoes sudden expansion in a perfectly insulated container?
#4
By Zain
Medium
Fact Checked
23 Feb 2026
If a car rounds a curve at double its original speed, the centripetal force required to keep it on its path will:
#5
By Zain
Medium
Fact Checked
23 Feb 2026
The greenhouse effect occurs because certain atmospheric gases are:
#6
By Zain
Medium
Fact Checked
22 Feb 2026
What element possesses the highest electronegativity on the Pauling scale?
#7
By Zain
Medium
Fact Checked
22 Feb 2026
Which physical property primarily determines a star’s lifecycle, luminosity, and eventual fate?
#8
By Zain
Medium
Fact Checked
14 Feb 2026
If voltage across a resistor is doubled and resistance is halved, what happens to the electric current?
#9
By Zain
Hard
Fact Checked
13 Feb 2026
Which discontinuity marks the primary boundary between the Earth’s lower mantle and outer core?
#10
By Zain
Medium
Fact Checked
13 Feb 2026
Which subatomic particle primarily determines an element’s chemical properties?

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