Science & Mathematics Topics
School level (Class 6–12) — Science & Mathematics
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Physics
Chemistry
Mathematics
Biology Option
Full Syllabus Mock Topics
quiz Questions
Q31
The lightest gas is
Newton
Watt
Joule
Hydrogen
Explanation
Hydrogen is the lightest element and gas.
Q32
Ozone is an allotrope of
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Oxygen
Newton
Explanation
Ozone is triatomic form of oxygen.
Q33
The hardest natural substance is
Newton
Diamond
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Joule
Explanation
Diamond is hardest natural material on Mohs scale.
Q34
The most abundant gas in Earth atmosphere is
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Nitrogen
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Newton
Explanation
Nitrogen forms about 78 percent of atmosphere.
Q35
The nearest star to Earth is
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Sun
Watt
Explanation
The Sun is the star closest to Earth.
Q36
The study of earthquakes is called
Seismology
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Newton
Watt
Explanation
Seismology studies earthquakes and seismic waves.
Q37
Richter scale measures
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Magnitude of earthquakes
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Newton
Explanation
Richter scale expresses earthquake magnitude.
Q38
The gas used in fire extinguishers is commonly
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Watt
Carbon dioxide
Joule
Explanation
CO2 extinguishers displace oxygen around flames.
Q39
Acid present in vinegar is
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Joule
Newton
Acetic acid
Explanation
Vinegar contains dilute acetic acid.
Q40
Baking soda is chemically
Sodium bicarbonate
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Watt
Joule
Explanation
Baking soda is NaHCO3.