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Did you know the average porcupine has 30,000 spikes.

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Class IX >> Science >> Structure of Atoms >> A1

Q1	In which year, J.J. Thomson was awarded with the Nobel prize?
A	1856
B	1940
C	1906
D	1871

Q2	Which of the following is NOT an inert gas?
A	Helium
B	Argon
C	Krypton
D	Hydrogen

Q3	For a neutral atom, number of protons will be equal to __________.
A	Number of Nucleons
B	Number of Neutrons
C	Number of Electrons
D	Zero

Q4	An neutral atom has atomic number 24 and mass number 52. What will be the number of electrons?
A	23
B	24
C	28
D	None of the Above

Q5	Thomson produced the model of an atom, which he related to __________.
A	Molecule
B	Balls
C	Melon
D	Watermelon

Q6	Neutron is a fundamental particle which carries __________.
A	Charge of -1 and Mass Zero
B	No Charge and Mass of One Unit
C	Charge of +1 and Mass of One Unit
D	No Charge and No Mass

Q7	What is the value of n for L shell?
A	Two
B	One
C	Three
D	Four

Q8	Which particle is known as doubly-charged helium ions?
A	Beta Particle
B	Alpha Particle
C	Gamma Particle
D	Electron

Q9	Name the scientist who discovered electron?
A	Goldstein
B	J.J.Thomson
C	Rutherford
D	Chadwick

Q10	Name the scientist who discovered proton?
A	Goldstein
B	Robert Millikan
C	Chadwick
D	J.J.Thomson

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