Atomic Structure

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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

A	reciprocal proportion
B	definite proportion

Question 2

In water hydrogen and oxygen are in the ratio by mass

A	1:8
B	8 : 1

Question 3

________ are the building blocks of all matter.

A	Atoms
B	Molecules

Question 4

Total mass of material present after the chemical reaction is _______ as the total mass before chemical reaction.

A	Barium chloride
B	Barium sulphate

Question 5

Water consists of hydrogen and oxygen in the ratio _______

A	1 : 8
B	2:1

Question 6

Matter is made up of small indivisible particles called ________

A	Molecules
B	atoms

Question 7

An atom consists of _____ particles.

A	neutral
B	charged

Question 8

The first experimental evidence for the electrical nature of matter came from the experiments of________

A	John Dalton
B	Michael Faraday

Question 9

The two electrodes of Cathode Ray Tube are connected with _____

A	low voltage
B	high voltage

Question 10

The electrode connected to the positive terminal of the battery is called the _______

A	Cathode
B	Anode

Question 11

_______ is a fluorescent material.

A	Zinc sulphide
B	Magnesium sulphide

Question 12

_________ can be defined as hydrogen ion.

A	Electron
B	H+

Question 13

The positively charged particles obtained from hydrogen gas are called ________

A	Electrons
B	Protons

Question 14

The mass of the particle is the same as the _______ of the gas inside the discharge tube.

A	atomic mass
B	charge

Question 15

The charge of an electron is _______

A	+1
B	-1

Question 16

________ model of atom is known as plum pudding or apple pie model.

A	Dalton’s
B	J.J.Thomson’s

Question 17

_______ were found as a stream of positively charged particles.

A	Cathode rays
B	Anode rays

Question 18

A _________ is used to lower the pressure inside the discharge tube.

A	pump
B	glass tube

Question 19

________model of atom could successfully explain the electrical neutrality of atom.

A	Dalton’s
B	J.J. Thomson’s

Question 20

Sir. William Crooke conducted an experiment using a _______ and found certain visible rays.

A	discharge tube
B	conical flask

Question 21

The presence of ________ charged particles in an atom has been predicted by Goldstein

A	positive
B	negative

Question 22

Fill in the blanks.

All living and non-living things are made up of _______

A	Mixture
B	matter
C	Mass

Question 23

When Hydrogen gas burns and combines with oxygen, it yields _______

A	Air
B	water
C	oil

Question 24

During a physical change the total _______ of the matter remains the same.

A	mass
B	Mixture

Question 25

Water consists of the same two elements ______ and _______

A	Nitrogen, Corbon dioxide
B	Hydrogen, oxygen
C	Nitrogen, Helium

Question 26

Atomic theory was proposed by an English school teacher _______

A	Issac Assimov
B	John Dalton
C	Alexander Fleming

Question 27

_________ is the smallest particle that take part in chemical reaction.

A	proton
B	Atom
C	Electron

Question 28

Michael Faraday showed that electricity is composed of particles called _________

A	protons
B	atoms of electricity
C	Neutrons

Question 29

The electrode which is connected to the negative terminal of the battery is called _________

A	cathode
B	anode
C	cation

Question 30

Air is a ________ conductor of electricity.

A	poor
B	fast

Question 31

Cathode rays originate from the ________

A	cathode
B	anode

Question 32

The nature of the cathode rays does not depend on the nature of the _______ inside the discharge table.

A	petrolium
B	gas
C	air

Question 33

The presence of positive charged particles in the atoms has been predicted by _______

A	neutron
B	Goldstein
C	mercury

Question 34

Each proton is produced when one ______ is removed from one hydrogen atom.

A	proton
B	electron
C	neutron

Question 35

The properties of ______ rays depend upon the nature of gas taken in the discharge tube.

A	cathode
B	anode

Question 36

The relative charge of a proton is _______

A	positive
B	negative

Question 37

______ can be defined as hydrogen ion(H+)

A	electron
B	proton
C	neutron

Question 38

According to the law of conservation of mass, __________ is neither created nor destroyed during physical or chemical change.

A	matter
B	mass
C	mixture

Question 39

On rubbing two objects together, they become electrically_____

A	charged
B	Uncharged
C	neutral

Question 40

When invisible radiation falls on materials like zinc sulphide, they will emit ________light.

A	invisible
B	visible

Question 41

Anode rays were found as a stream of ______ charged particles.

A	positively
B	negatively

Question 42

_________ is the description of depending the arrangement of various fundamental particles inside an atom.

A	Atom model
B	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

A	1 4 5 2 3
B	4 1 2 3 5
C	5 4 2 3 1
D	2 3 1 5 4

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Atomic Structure

Atomic Structure - 8th Std Science

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