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MCQ on Class 9 Science Atoms and Molecules

Last updated on August 30th, 2023 at 01:44 am

Class 9 Science Atoms and Molecules MCQ

 

Who was the Indian philosopher who postulated the idea of the smallest particles called Parmanu?
a) Maharishi Kanad
b) Pakudha Katyayama
c) Socrates
d) Plato
Answer: a) Maharishi Kanad

 

According to Maharishi Kanad, what is the nature of Parmanu?
a) They are invisible particles
b) They are divisible particles
c) They are the smallest particles of matter
d) They are made up of combined forms
Answer: c) They are the smallest particles of matter

 

Which Indian philosopher elaborated on the doctrine of Parmanu and its existence in combined forms?
a) Maharishi Kanad
b) Pakudha Katyayama
c) Aristotle
d) Confucius
Answer: b) Pakudha Katyayama

 

What did Maharishi Kanad and Pakudha Katyayama believe about the divisibility of matter?
a) Matter can be divided into infinite particles
b) Matter cannot be divided at all
c) Matter can be divided until we reach the smallest particles called Parmanu
d) Matter can be divided until we reach the atomic level
Answer: c) Matter can be divided until we reach the smallest particles called Parmanu

 

In which civilization did these ancient philosophers speculate about the smallest particles of matter?
a) Ancient Egypt
b) Ancient China
c) Ancient India
d) Ancient Rome
Answer: c) Ancient India

 

Who were the ancient Greek philosophers who suggested the existence of indivisible particles called atoms?
a) Socrates and Plato
b) Aristotle and Pythagoras
c) Democritus and Leucippus
d) Hippocrates and Euclid
Answer: c) Democritus and Leucippus

 

What did Democritus call the indivisible particles?
a) Parmanu
b) Elements
c) Compounds
d) Atoms
Answer: d) Atoms

 

Who laid the foundation of chemical sciences by establishing two important laws of chemical combination?
a) Antoine L. Lavoisier
b) Isaac Newton
c) Albert Einstein
d) Marie Curie
Answer: a) Antoine L. Lavoisier

 

What were the two important laws of chemical combination established by Antoine L. Lavoisier?
a) Law of Gravity and Law of Thermodynamics
b) Law of Conservation of Mass and Law of Definite Proportions
c) Law of Motion and Law of Electric Charges
d) Law of Genetics and Law of Evolution
Answer: b) Law of Conservation of Mass and Law of Definite Proportions

 

Who stated the law of constant proportions, also known as the law of definite proportions?
a) Antoine L. Lavoisier
b) John Dalton
c) Proust
d) Democritus
Answer: c) Proust

 

Which scientist provided the basic theory about the nature of matter and introduced the concept of atoms?
a) Antoine L. Lavoisier
b) John Dalton
c) Proust
d) Democritus
Answer: b) John Dalton

 

What did John Dalton’s atomic theory explain?
a) The law of gravity
b) The law of thermodynamics
c) The law of conservation of mass and the law of definite proportions
d) The law of motion
Answer: c) The law of conservation of mass and the law of definite proportions

 

According to Dalton’s atomic theory, what are the smallest particles of matter called?
a) Parmanu
b) Elements
c) Compounds
d) Atoms
Answer: d) Atoms

 

In which year did John Dalton present his atomic theory?
a) 1766
b) 1793
c) 1808
d) 1824
Answer: c) 1808

 

According to Dalton’s atomic theory, what are the small particles that make up all matter called?
a) Molecules
b) Elements
c) Particles
d) Atoms
Answer: d) Atoms

 

According to Dalton’s atomic theory, what is the nature of atoms?
a) They are divisible particles.
b) They can be created or destroyed in a chemical reaction.
c) They are identical in mass and chemical properties.
d) They are large particles composed of multiple elements.
Answer: c) They are identical in mass and chemical properties.

 

According to Dalton’s atomic theory, what remains constant in a given compound?
a) The mass of atoms
b) The chemical properties of atoms
c) The number of atoms and their kinds
d) The ratio of atoms to molecules
Answer: c) The number of atoms and their kinds.

 

Who was the first scientist to use symbols for elements in a specific sense?
a) Antoine L. Lavoisier
b) John Dalton
c) Berzilius
d) Democritus
Answer: b) John Dalton

 

What did John Dalton’s use of symbols for elements represent?
a) Different isotopes of the element
b) Different compounds of the element
c) A definite quantity of the element, specifically one atom
d) Various physical properties of the element
Answer: c) A definite quantity of the element, specifically one atom.

 

Who suggested that symbols for elements should be made from one or two letters of the element’s name?
a) Antoine L. Lavoisier
b) John Dalton
c) Berzilius
d) Democritus
Answer: c) Berzilius

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