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Main Subjects MCQs With Answers
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Which gas is essential for combustion, or burning, to take place?
AHelium
BOxygen
CCarbon dioxide
DNitrogen
What gas is mainly responsible for the fresh, sharp smell noticed after lightning strikes nearby?
AOzone
BMethane
CAmmonia
DHydrogen sulfide
In a series electrical circuit, what happens to the other bulbs if one bulb fails?
AThey continue to glow normally
BThey glow brighter
CThey also stop working because the circuit breaks
DNothing changes at all
Which gas is commonly used to fill party balloons so that they float in the air?
ANitrogen
BCarbon dioxide
CHelium
DOxygen
What type of energy conversion takes place inside a solar panel?
AChemical energy to electrical energy
BLight energy to electrical energy
CHeat energy to mechanical energy
DElectrical energy to light energy
What is the common name for the compound with the chemical formula CH3COOH?
AFormic acid
BLactic acid
CCitric acid
DAcetic acid, found in vinegar
What term describes a substance that speeds up a chemical reaction without being consumed by it?
AReactant
BSolvent
CCatalyst
DPrecipitate
Newton’s Third Law of Motion states that for every action there is what?
AA delayed reaction
BAn equal and opposite reaction
CA stronger reaction
DNo reaction
At what temperature does pure water freeze at standard atmospheric pressure?
A-10 degrees C
B0 degrees C
C4 degrees C
D10 degrees C