EASY
9th CBSE
IMPORTANT
Earn 100

How can we check that electrons are material particles?
(i) Electric field is applied on the cathode rays.
(ii) Mica wheels mounted on an axle.
(iii) Mica wheels placed in the path of cathode rays.
(iv) Cathode rays deflected towards electric fields.

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Important Questions on Structure of Atom

EASY
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 9 - Structure of Atom>Practice Questions
Which of the following is correct about cathode rays?
(i) They are deflected towards the positive plate of the electric field.
(ii) The nature of cathode rays does not depend upon the nature of the material of the cathode.
(iii) The nature of cathode rays depends upon the nature of the gas taken in the discharge tube.
(iv) Cathode rays are made up of electrons.
EASY
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 9 - Structure of Atom>Practice Questions
How many of the following are correct observation / conclusion from Rutherford's scattering experiment?
(i) Nucleus is small but heavy.
(ii) Nucleus always carries positive charge.
(iii) The number of α-particles hitting the nucleus is very large.
(iv) Atom is nearly 105 times greater than the size of the nucleus.
EASY
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 9 - Structure of Atom>Practice Questions
Neutron is present in all atoms
(i) Protium (ii) Deuterium (iii) Tritium (iv) Helium
EASY
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 9 - Structure of Atom>Practice Questions
Isobars differ in number of
(i) Protons (ii) Electrons (iii) Neutrons (iv) Nucleons
EASY
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 9 - Structure of Atom>Practice Questions
Which of the following isotopes are not used in the treatment of cancer?
(i) P - 32 (ii) I - 131 (iii) Co - 60 (iv) U - 235
EASY
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 9 - Structure of Atom>Practice Questions
The valency of which of the following elements is not zero?
(i) Hydrogen (ii) Helium (iii) Gold (iv) Silver
MEDIUM
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 9 - Structure of Atom>Practice Questions
Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons + number of neutrons
(iv) Atomic number = number of protons + number of electrons
MEDIUM
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 9 - Structure of Atom>Practice Questions
Column I Column II
A. Ernest Rutherford (i) Indivisibility of Atoms
B. J J Thomson (ii) Stationary orbits
C. Dalton (iii) Concept of nucleus
D. Neil Bohr (iv) Discovery of electrons