NCERT MCQ CLASS-9 CHAPTER-4 | STRUCTURE OF ATOM | EDUGROWN
NCERT MCQ ON STRUCTURE OF ATOM
1.) Electron is represented as ……….
a) El
b) E
c) e
d) none of the above
Answer-e
2.) Proton is represented as………….
a) Pr
b) E
c) P
d) None of the above
Answer-P
3.) Ions containing positive charge called…………
a) Positive charge
b) Positive ion
c) Proton
d) Photon
Answer-Proton
4.) Ions containing negative charge called………….
a) Electron
b) Negative particle
c) Negative ion
d) Negative charge
Answer-Electron
5.) Atoms is composed of…………….and………….
a) Neutron
b) Proton , electron
c) Positron, proton
d) Neutron , electron
Answer-Proton , electron
6.) Which experiment designed by Rutherford?
a) Atom is looks like watermelon
b) Moving alpha particles fall on thin magnesium foil
c) Moving alpha particles fall on thin gold foil
d) Moving alpha particles fall on thin silver foil
Answer-Moving alpha particles fall on thin gold foil
7.) The revolution of the electron in a circular orbit is not expected is not expected to be stable.
a) It is drawback of Dalton
b) It is drawback Rutherford’s
c) It is drawback Mendeleev’s
d) None of the above
Answer-It is drawback Rutherford’s
8.) The orbit or shells are called………………
a) Energy level
b) Subshells
c) Parameters
d) K shell
Answer-Energy level
9.) First Orbits or shells represent by the letter
a) K
b) P
c) T
d) M
Answer-K
10.) Second Orbits or shells represent by the letter
a) K
b) L
c) T
d) M
Answer-L
11.) Uncharged particle present in the atom called……….
a) Positron
b) Neutron
c) Electron
d) None of the above
Answer-Neutron
12.) ………….. are present in atoms having no any charge
a) Positron
b) Neutron
c) Electron
d) None of the above
Answer-Neutron
13.) Molecular mass means sum of …………………. and ……………
a) Proton, neutron
b) Proton , electron
c) Positron, proton
d) Photon, neutron
Answer-Proton, neutron
14.) Sum of proton and neutron gives……………………. of molecule
a) Atomic number
b) Atomic unit
c) Molecular formula
d) Molecular weight
Answer-Molecular weight
15.) Atomic number means?
a) Proton number
b) Neutron number
c) Proton and neutron number
d) Electron and proton number
Answer-Proton number
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