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Chemistry - 9 Chapter - 3
Atomic Structure
Test - 5
1.
In cathode ray tube electrons and protons move in __________ direction.
a) Random
b) Opposite
c) Same
d) No answer is correct
2.
Positive rays, produced in the discharge tube, travel in the same direction as the cathode rays.
a) False
b) True
3.
Fogging of the photographic plates is causes by ?
a) Uranium only
b) Radioactive materials
c) Radium only
4.
Uranium is more radioactive than radium.
a) True
b) False
5.
Define Radioactive Rays?
a) Rays emitted from radioactive elements or their compounds, which can cause photographic qualities.
b) Rays emitted from radioactive elements or their compounds, which can cause fogging of the photographic plate.
6.
Radioactive rays can cause ionization of gases if passed through these.
a) True
b) False
7.
Radioactive rays are of ____________ types.
a) 5
b) 2
c) 3
d) 4
8.
Define a-Rays (Alpha-rays )?
a) These are positively charged particles emitted from a radioactive substance. They carry two positive charges and are called helium nuclei.
b) These are positively charged particles emitted from a radioactive substance. They carry two positive charges and are called helium nuclium.
9.
What are b-Rays ( Beta Rays )?
a) These are electrons emitted from a radioactive substance.
b) These are electrons absorbed by a radioactive substance.
10.
Alpha rays bend towards _______ pole and are ______charged.
a) Negative pole, Positively
b) No effect
c) Positive pole, Negatively
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