EASY
9th CBSE
IMPORTANT
Earn 100

The following diagram depicts the Rutherford’s experiment.

Why was zinc sulphide screen is used in the experiment?

(a)To block -particles from going straight.
(b)To detect deflection of -particles.
(c)To further deflect -particles as the gold foil did.
(d)To absorb -particles and utilise it again.

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Important Questions on Structure of the Atom
EASY
9th CBSE
IMPORTANT
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order.
(i) Rutherford's atomic model
(ii) Thomson's atomic model
(iii) Bohr's atomic model.

EASY
9th CBSE
IMPORTANT
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.

EASY
9th CBSE
IMPORTANT

EASY
9th CBSE
IMPORTANT
Different isotopes are matched with their uses as
(i) -To treat cancer
(ii) -To produce electricity
(iii) -To treat goitre
(iv) -In agricultural research
Which of the above matches are correct?

EASY
9th CBSE
IMPORTANT
