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81
On the Mohs hardness scale, which mineral defines the lowest hardness value (1)?
A. Talc
B. Gypsum
C. Calcite
D. Quartz
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Correct Option
Explanation
Talc is the softest mineral and defines Mohs hardness 1, being easily scratched by all other minerals on the scale.
82
At room temperature (~20°C), sound travels fastest in which medium?
A. Air
B. Steel (solid)
C. Water (liquid)
D. Vacuum
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Correct Option
Explanation
Sound travels fastest in solids because of higher elastic modulus and density transmission properties; among the given options, steel (a solid) supports the highest speed.
83
Which cellular process generates the greatest amount of ATP per glucose molecule in aerobic eukaryotic cells?
A. Oxidative phosphorylation (electron transport chain and chemiosmosis)
B. Glycolysis
C. Citric acid (Krebs) cycle
D. Fermentation
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Correct Option
Explanation
Oxidative phosphorylation produces the majority of ATP (~26–34 ATP per glucose) via the electron transport chain and chemiosmosis, far exceeding glycolysis or the Krebs cycle alone.
84
What was the principal significance of Martin Luther’s 95 Theses (1517) for European history?
A. They initiated a public challenge to Church practices and papal authority, sparking the Protestant Reformation.
B. They called for the immediate abolition of all Church sacraments and monastic orders.
C. They established a new Catholic doctrine formally recognized by the papacy.
D. They promoted a unified German nation-state under the pope’s protection.
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Explanation
Luther’s theses attacked the sale of indulgences and questioned ecclesiastical authority, triggering debates that led to the Protestant Reformation.
85
During the Environmental Impact Assessment (EIA) process, the stage that determines whether a full EIA is required is called:
A. Mitigation.
B. Monitoring.
C. Reporting.
D. Screening.
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Correct Option
Explanation
Screening is the initial EIA stage used to decide if a project needs a full assessment, making option d correct.
86
Currently in which country there were massive protests against the economic crisis and oil shortage?
A. Kenya
B. Maldives
C. Indonesia
D. Sri-Lanka
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Correct Option
Explanation
As stated, Sri Lanka experienced massive protests driven by an economic crisis and shortages of fuel.
87
Which planet which is easily visible from the Earth?
A. Venus
B. Mercury
C. Mars
D. Jupitar
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Correct Option
Explanation
Venus is the brightest planet as seen from Earth and is easily visible near sunrise or sunset.
88
Who won the football world cup in 2018?
A. Germany
B. Brazil
C. France
D. England
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Correct Option
Explanation
France won the 2018 FIFA World Cup, beating Croatia in the final.
89
The shortest day occurs in the Northern hemisphere is on_____?
A. 22nd December
B. 22nd November
C. 22nd June
D. 22nd March
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Correct Option
Explanation
The shortest day in the Northern Hemisphere occurs on the winter solstice, given here as 22nd December when daylight hours are minimal.
90
The Synonym of Detest?
A. Argue
B. Hate
C. Discover
D. Reveal
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Correct Option
Explanation
Detest means to hate or strongly dislike, so the synonym 'Hate' directly matches the meaning of 'detest.'
