MCQ on Inside the Atom Class 8
Almost the entire mass of an atom is concentrated in the ……..
1) proton
2) electrons
3) nucleus
4) neutrons
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The mass of the atom is determined by ………
1) neutrons
2) neutron and proton
3) electron
4) electron and neutron
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An atom has a mass number of 23 and atomic number 11. The number of protons are ……….
1) 11
2) 12
3) 23
4) 44
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Electron was discovered by ………
1) Chadwick
2) Thomson
3) Goldstein
4) Bohr
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Cathode rays are deflected towards ……….
1) positive electrode
2) negative electrode
3) both electrodes
4) none of the electrodes
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Which of the air pressures is appropriate for the production of cathode rays in the discharge tube?
1) 1 cm Hg
2) 1 mm Hg
3) 0.001 cm Hg
4) 0.001 mm Hg
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The K, L and M shells of an atom are completely filled. Its atomic number is
1) 30
2) 20
3) 10
4) 12
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Electrons was discovered by
1) Rutherford
2) Thomson
3) Chadwick
4) Bohr
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Nucleus was discovered by
1) Rutherford
2) Thomson
3) Chadwick
4) Bohr
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The fixed circular paths around the nucleus are called
1) orbits
2) shells
3) orbitals
4) Both 1 & 2
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