NCERT Class 9 Science MCQ Chapter 8 Journey Inside the Atom English Medium As Per New Syllabus. NCERT Class 9 Science MCQ Chapter 8 Journey Inside the Atom Notes to each chapter is provided in the list so that you can easily browse throughout different chapter NCERT Class 9 Science MCQ Chapter 8 Journey Inside the Atom Question Answer Download PDF and select needs one. CBSE Class 9 Science Multiple Choice Solutions.
NCERT Class 9 Science MCQ Chapter 8 Journey Inside the Atom
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Journey Inside the Atom
Chapter – 8
| MCQ |
Tick the Correct Options:
1. Who suggested that the smallest indivisible particles of matter are called ‘parmanus’ in ancient India?
(a) Democritus.
(b) Leucippus.
(c) Acharya Kanada.
(d) John Dalton.
Ans: (c) Acharya Kanada.
2. Which scientist proposed the first scientific description of how matter is made in 1808?
(a) J.J. Thomson.
(b) John Dalton.
(c) Ernest Rutherford.
(d) Niels Bohr.
Ans: (b) John Dalton.
3. Who discovered the electron through the study of conduction of electric current through gases?
(a) J.J. Thomson.
(b) Ernest Rutherford.
(c) James Chadwick.
(d) Niels Bohr.
Ans: (a) J.J. Thomson.
4. In Thomson’s ‘plum pudding’ model, what does the red pulp of a watermelon represent?
(a) The seeds of a watermelon.
(b) The positively charged matter.
(c) The negatively charged electrons.
(d) The empty space in an atom.
Ans: (b) The positively charged matter.
5. Which subatomic particles were aimed at a thin gold foil in Rutherford’s famous scattering experiment?
(a) Beta particles.
(b) Gamma rays.
(c) Alpha particles.
(d) Neutrons.
Ans: (c) Alpha particles.
6. What was the major conclusion from the few alpha particles that bounced back in Rutherford’s experiment?
(a) Electrons are extremely heavy.
(b) Atoms are entirely solid.
(c) Positive charge and mass are packed into a tiny central nucleus.
(d) Neutrons make up the outer shell.
Ans: (c) Positive charge and mass are packed into a tiny central nucleus.
7. What was the main limitation of Rutherford’s planetary model of the atom?
(a) It couldn’t explain the existence of electrons.
(b) It couldn’t explain the stability of the atom.
(c) It didn’t account for the empty space.
(d) It failed to discover the nucleus.
Ans: (b) It couldn’t explain the stability of the atom.
8. Which subatomic particle was discovered by James Chadwick in 1932?
(a) Electron.
(b) Proton.
(c) Neutron.
(d) Alpha particle.
Ans: (c) Neutron.
9. Which of the following subatomic particles is NOT present in the nucleus of a typical hydrogen atom?
(a) Proton.
(b) Neutron.
(c) Nucleon.
(d) Positive charge.
Ans: (b) Neutron.
10. In Niels Bohr’s model, the fixed circular paths where electrons revolve are called:
(a) Nucleons.
(b) Stationary states or energy levels.
(c) Alpha paths.
(d) Electron clouds.
Ans: (b) Stationary states or energy levels.
11. What is the formula to find the maximum number of electrons present in a shell, where ‘n’ is the shell number?
(a) n².
(b) 2n.
(c) 2n².
(d) n/2.
Ans: (c) 2n².
12. According to Bohr and Bury, what is the maximum number of electrons that can be accommodated in the outermost shell of an atom?
(a) 2.
(b) 8.
(c) 18.
(d) 32.
Ans: (b) 8.
13. Which international organization approves the names and symbols of elements today?
(a) BARC.
(b) TIFR.
(c) IUPAC.
(d) WHO.
Ans: (c) IUPAC.
14. The chemical symbol ‘Fe’ for Iron is derived from its Latin name:
(a) Iridium.
(b) Ferrum.
(c) Fluorine.
(d) Francium.
Ans: (b) Ferrum.
15. The atomic number (Z) of an element is directly equal to the number of:
(a) Neutrons in the nucleus.
(b) Protons in the nucleus.
(c) Nucleons in the atom.
(d) Total particles in the atom.
Ans: (b) Protons in the nucleus.
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