EASY
9th CBSE
IMPORTANT
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What is the origin of the anode rays?
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Important Questions on Structure of Atom
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.
EASY
9th CBSE
IMPORTANT
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
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.
