EASY
9th CBSE
IMPORTANT
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What is proton?
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Important Questions on Structure of Atom
EASY
9th CBSE
IMPORTANT
How do you determine the charge on the cathode rays?
EASY
9th CBSE
IMPORTANT
What is the origin of the anode rays?
MEDIUM
9th CBSE
IMPORTANT
Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
EASY
9th CBSE
IMPORTANT
Oxygen atom has 8 electrons, 8 protons and 8 neutrons whereas sulphur atom has 16 electrons, 16 protons and 16 neutrons. Find out the mass number of oxygen and sulphur atoms.
EASY
9th CBSE
IMPORTANT
If K and L - shells of an atom are full, then what would be the total number of electrons in the atom?
EASY
9th CBSE
IMPORTANT
What are canal rays?
(i) They are anode rays
(ii) They pass through the holes or canals in the cathode
(iii) They travel in straight lines
(iv) None of above
EASY
9th CBSE
IMPORTANT
What is mass number?
(i) Sum of number of neutrons (ii) Average relative mass of its atoms
(iii) Sum of number of protons (iv) Whole number of electrons27
EASY
9th CBSE
IMPORTANT
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.
