Question 1 of 5
Who among the following ancient philosophers proposed the idea of 'Parmanu' as the smallest indivisible particle of matter?
A
Maharshi Kanad
B
Democritus
C
Dalton
D
Aristotle
Why: Maharshi Kanad, an ancient Indian philosopher, proposed the concept of 'Parmanu' as indivisible eternal particles of matter around 600 BC. This is part of the historical approach to particulate nature. Democritus used 'atomos', Dalton proposed modern atomic theory, and Aristotle favored continuous matter. Thus, option A is correct.
Question 2 of 5
The Greek philosopher who coined the term 'atomos' for the indivisible particle of matter is:
A
Democritus
B
Leucippus
C
Epicurus
D
Plato
Why: Democritus, along with Leucippus, proposed that matter is composed of indivisible particles called 'atomos'. This laid early foundation for particulate nature of matter. Option A matches this historical fact.
Question 3 of 5
Which postulate of Dalton's atomic theory directly supports the particulate nature of matter?
A
Matter consists of indivisible atoms
B
Atoms of different elements have different masses
C
Atoms can neither be created nor destroyed
D
Compounds are formed by combination of atoms
Why: Dalton's first postulate states that all matter is composed of tiny indivisible particles called atoms, establishing the particulate model against continuous matter view. This is the core historical development.
Question 4 of 5
In the historical development, who provided experimental evidence for the existence of atoms through Brownian motion?
A
Robert Brown
B
J.J. Thomson
C
Einstein
D
Avogadro
Why: Robert Brown observed erratic movement of pollen grains in water, explained by Einstein as due to collisions with invisible water particles (atoms/molecules), confirming particulate nature.
Question 5 of 5
Assertion (A): Ancient Indian philosophy recognized matter as particulate. Reason (R): Kanad's Parmanu concept was similar to Dalton's atom.
Codes: (a) Both A and R true, R explains A (b) Both true, R does not explain A (c) A true, R false (d) A false, R true
A
(a) Both A and R true, R explains A
B
(b) Both true, R does not explain A
C
(c) A true, R false
D
(d) A false, R true
Why: Both are true: Kanad proposed Parmanu as indivisible particles. However, R does not fully explain A as Dalton's theory included modern postulates like chemical combinations, unlike philosophical Parmanu.
