IIT FOUNDATION
Test – 3 (IX Std)
Name-___________________________________________________
I. Choose the correct answer :
1) Name the scientist who named cathode ray particle as electron
A) G.J. Stoney B) Schrodinger C) Neils Bohr D) Heisenberg
2) Alpha particles could be defined as
A) protons removed from helium atom. B) Electrons removed form lithium atom
C) Electrons removed from helium atom D) Helium atom
3) Entire mass of the atom is located in the
A) orbits surrounding the nucleus B) centre of the atomic sphere
B) electrons only D) none of the above
4) Mass of the proton is _____________ times greater than the electron.
A) 2350 B) 1837 C) 1950 D) 2000
5) 1 a.m.u = _____________ gm.
A) 16.4 x 10-24 B) 16.4 x 10-24
C) 167 x 10-24 D) 0.167 x 10-24
II. Fill in the blanks :
6) Rutherford’s atom model is also known as ______________________ model.
7) _______________________ Invented neutron.
8) Nucleus of Helium is _____________________________.
9) Cathode rays travel in ________________________ from cathode to anode.
10) ___________________ are also called canal rays.
11) Anode ray particle is called a ____________________________.
12) Watermelon fruit model of the atom was proposed by ___________________.
13) Neutron possesses ____________________ charge.
14) The particles present in a nucleus are known as _____________________ model.
15) Cathode rays are discovered by ____________________ in discharge tube experiments.
III. Answer the following :
16) Distinguish between atomic number and mass number.
17) Distinguish between protons and electrons.
18) Distinguish between Cathode rays and Canal rays.
19) What happens to the path of the cathode rays beam when a magnetic field and electrified are applied ?
20) What are the drawbacks of Rutherford’’s atomic model ?
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