#1
Which of the following is a fundamental force of nature?
Gravity
ExplanationIt is the force that attracts objects with mass towards each other.
#2
What is the chemical symbol for water?
H2O
ExplanationIt represents two hydrogen atoms bonded to one oxygen atom.
#3
What is the process by which plants make their food?
Photosynthesis
ExplanationPlants convert light energy into chemical energy.
#4
Which of the following is NOT a state of matter?
Gravity
ExplanationGravity is a fundamental force, not a state of matter.
#5
What is the chemical symbol for gold?
Au
ExplanationIt comes from the Latin word 'aurum'.
#6
Which scientist proposed the theory of relativity?
Albert Einstein
ExplanationHe introduced the theory of special and general relativity.
#7
What is the unit of electric current?
Ampere
ExplanationIt measures the rate of flow of electric charge.
#8
Who developed the first successful polio vaccine?
Jonas Salk
ExplanationHe discovered and developed the first effective polio vaccine.
#9
What is the chemical formula for table salt?
NaCl
ExplanationIt consists of sodium (Na) and chlorine (Cl) ions.
#10
Who proposed the laws of motion?
Isaac Newton
ExplanationHe formulated the three laws of motion.
#11
Which of the following is NOT a renewable energy source?
Coal
ExplanationIt is a fossil fuel derived from ancient organic matter.
#12
Which of the following is NOT a component of the nervous system?
Stomach
ExplanationThe stomach is part of the digestive system, not the nervous system.
#13
What is the chemical formula for methane?
CH4
ExplanationIt consists of one carbon atom and four hydrogen atoms.
#14
What is the chemical symbol for iron?
Fe
ExplanationIt comes from the Latin word 'ferrum'.
#15
Who discovered the theory of general relativity?
Albert Einstein
ExplanationHe proposed it in 1915.