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Chemistry - 9 Chapter - 3
Atomic Structure
Test - 3
1.
When an electric current is passed through any gas at low pressure, its atoms?
a) All are correct
b) Start Glowing
c) Become fully charged.
d) Split into +VE and -VE parts
2.
Total 109 elements exist which include 92 natural and 16 artificial
a) False
b) True
3.
Element is a substance in which all atoms are similar, having same atomic number
a) False
b) True
4.
Element is a substance in which all atoms are similar, having same atomic mass.
a) False
b) True
5.
Define Discharge Tube?
a) A glass tube containing a liquid at a very low pressure and provided with electrodes to study the passage of electricity through the gas.
b) A glass tube containing a gas at a very low pressure and provided with electrodes to study the passage of electricity through the ga
6.
Define Cathode Rays?
a) Rays absorbed by cathode in the discharge tube.
b) Rays emitted from cathode in the discharge tube.
7.
Define Positive rays?
a) Rays produced in the discharge tube, which are traveling in a direction similar to the cathode rays
b) Rays produced in the discharge tube, which are traveling in a direction opposite to the cathode rays
8.
Cathode Ray Tube helped in the discovery of?
a) Neutrons
b) Protons
c) Electrons and protons
d) Electrons
9.
In cathode ray tube a low pressure of atmosphere is maintained
a) 10
-4
b) 10
-4
c) C 10
d) 10
-5
10.
Each electron carries a charge of _________ coulombs
a) 6.022x10
23
b) -1.602x10
-19
c) 1.602x10
-19
d) None is correct
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