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Atomic Structure
Atomic Structure - 8th Std Science
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Question 1 |
The same proportion of carbon and oxygen in carbon dioxide obtained from different sources proves the law of
reciprocal proportion | |
definite proportion |
Question 2 |
In water hydrogen and oxygen are in the ratio by mass
1:8 | |
8 : 1 |
Question 3 |
________ are the building blocks of all matter.
Atoms | |
Molecules |
Question 4 |
Total mass of material present after the chemical reaction is _______ as the total mass before chemical reaction.
Barium chloride | |
Barium sulphate |
Question 5 |
Water consists of hydrogen and oxygen in the ratio _______
1 : 8 | |
2:1 |
Question 6 |
Matter is made up of small indivisible particles called ________
Molecules | |
atoms |
Question 7 |
An atom consists of _____ particles.
neutral | |
charged |
Question 8 |
The first experimental evidence for the electrical nature of matter came from the experiments of________
John Dalton | |
Michael Faraday |
Question 9 |
The two electrodes of Cathode Ray Tube are connected with _____
low voltage | |
high voltage |
Question 10 |
The electrode connected to the positive terminal of the battery is called the _______
Cathode | |
Anode |
Question 11 |
_______ is a fluorescent material.
Zinc sulphide | |
Magnesium sulphide |
Question 12 |
_________ can be defined as hydrogen ion.
Electron | |
H+ |
Question 13 |
The positively charged particles obtained from hydrogen gas are called ________
Electrons | |
Protons |
Question 14 |
The mass of the particle is the same as the _______ of the gas inside the discharge tube.
atomic mass | |
charge |
Question 15 |
The charge of an electron is _______
+1 | |
-1 |
Question 16 |
________ model of atom is known as plum pudding or apple pie model.
Dalton’s | |
J.J.Thomson’s |
Question 17 |
_______ were found as a stream of positively charged particles.
Cathode rays | |
Anode rays |
Question 18 |
A _________ is used to lower the pressure inside the discharge tube.
pump | |
glass tube |
Question 19 |
________model of atom could successfully explain the electrical neutrality of atom.
Dalton’s | |
J.J. Thomson’s |
Question 20 |
Sir. William Crooke conducted an experiment using a _______ and found certain visible rays.
discharge tube | |
conical flask |
Question 21 |
The presence of ________ charged particles in an atom has been predicted by Goldstein
positive | |
negative |
Question 22 |
- Fill in the blanks.
Mixture | |
matter | |
Mass |
Question 23 |
When Hydrogen gas burns and combines with oxygen, it yields _______
Air | |
water | |
oil |
Question 24 |
During a physical change the total _______ of the matter remains the same.
mass | |
Mixture |
Question 25 |
Water consists of the same two elements ______ and _______
Nitrogen, Corbon dioxide | |
Hydrogen, oxygen | |
Nitrogen, Helium |
Question 26 |
Atomic theory was proposed by an English school teacher _______
Issac Assimov | |
John Dalton | |
Alexander Fleming |
Question 27 |
_________ is the smallest particle that take part in chemical reaction.
proton | |
Atom | |
Electron |
Question 28 |
Michael Faraday showed that electricity is composed of particles called _________
protons | |
atoms of electricity | |
Neutrons |
Question 29 |
The electrode which is connected to the negative terminal of the battery is called _________
cathode | |
anode | |
cation |
Question 30 |
Air is a ________ conductor of electricity.
poor | |
fast |
Question 31 |
Cathode rays originate from the ________
cathode | |
anode |
Question 32 |
The nature of the cathode rays does not depend on the nature of the _______ inside the discharge table.
petrolium | |
gas | |
air |
Question 33 |
The presence of positive charged particles in the atoms has been predicted by _______
neutron | |
Goldstein | |
mercury |
Question 34 |
Each proton is produced when one ______ is removed from one hydrogen atom.
proton | |
electron | |
neutron |
Question 35 |
The properties of ______ rays depend upon the nature of gas taken in the discharge tube.
cathode | |
anode |
Question 36 |
The relative charge of a proton is _______
positive | |
negative |
Question 37 |
______ can be defined as hydrogen ion(H+)
electron | |
proton | |
neutron |
Question 38 |
According to the law of conservation of mass, __________ is neither created nor destroyed during physical or chemical change.
matter | |
mass | |
mixture |
Question 39 |
On rubbing two objects together, they become electrically_____
charged | |
Uncharged | |
neutral |
Question 40 |
When invisible radiation falls on materials like zinc sulphide, they will emit ________light.
invisible | |
visible |
Question 41 |
Anode rays were found as a stream of ______ charged particles.
positively | |
negatively |
Question 42 |
_________ is the description of depending the arrangement of various fundamental particles inside an atom.
Atom model | |
electron model |
Question 43 |
Match the following
- John Dalton a. electrons
- cathode rays b. protons
- Hydrogen ions c. meteorologist
- William Crooke d. Zinc sulphide
- fluorescent material e. Discharge tube
1 4 5 2 3 | |
4 1 2 3 5 | |
5 4 2 3 1 | |
2 3 1 5 4 |
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There are 43 questions to complete.