MCQs of Atomic Structure of Chapter 4 of Class IX
1. Electron is a .......charged particle
(a) Negatively
(b) Positively
(c) Zero
(d) None of These
2. Proton is a .......charged particle
(a) Negatively
(b) Positively
(c) Zero
(d) None of These
3. Neutron has.......charge
(a) Negative
(b ) Positive
(c) Zero
(d) None of These
4. The charge on electron is
(a) 1.6022 x 10⁻¹⁹
(b) -1.6022 x 10⁻¹⁹
(c) 1.6022 x 10¹⁹
(d) -1.6022 x 10¹⁹
5. The charge on proton is
(a) 1.6022 x 10⁻¹⁹
(b) -1.6022 x 10⁻¹⁹
(c) 1.6022 x 10¹⁹
(d) -1.6022 x 10¹⁹
6. Electron were discovered by
(a) Goldstein
(b) James Chadwick
(c) J J Thomson
(d) None of These
7. Proton were discovered by
(a) Goldstein
(b) James Chadwick
(c) J J Thomson
(d) None of These
8. Neutron were discovered by
(a) Goldstein
(b) James Chadwick
(c) J J Thomson
(d) None of These
9. Who discovered nucleus
(a) Goldstein
(b) James Chadwick
(c) J J Thomson
(d) Rutherford
10. First energy level (K-shell) can have maximum of ........electron
(a) 2
(b) 8
(c) 18
(d) 32
11. Second energy level (L-shell) can have maximum of ........electron
(a) 2
(b) 8
(c) 18
(d) 32
12. Third energy level (M-shell) can have maximum of ........electron
(a) 2
(b) 8
(c) 18
(d) 32
13. Fourth energy level (N-shell) can have maximum of ........electron
(a) 2
(b) 8
(c) 18
(d) 32
14. The minimum energy needed to remove an electron from an isolated atom or ion in its ground state is called
(a) Electronegativity
(b) Energy level
(c) Ionization energy
(d) None of These
15. Electronegativity .......from left to right in a period
(a) Decreases
(b) Remains Same
(c) Increases
(d) None of These
16. Ionization energies .......from top to bottom in a group
(a) Decreases
(b) Remains Same
(c) Increases
(d) None of These
17. Half of the distance between the nucleus of two similar adjacent atoms is called.......
(a) Half Life
(b) Atomic Radius
(c) Both
(d) None of These
18. Proton is .... times heavier than electron
(a) 1842
(b) 1600
(c) 1836
(d) None of These
19. Electron has mass equal to.......
(a) 1.6726 x 10⁻² kg
(b) 1.6022 x 10⁻¹⁹ kg
(c) 9.11 x 10⁻³¹ kg
(d) 1.67492 x 10⁻²⁷ kg
20. Proton has mass equal to.......
(a) 1.6726 x 10⁻² kg
(b) 1.6022 x 10⁻¹⁹ kg
(c) 9.11 x 10⁻³¹ kg
(d) 1.67492 x 10⁻²⁷ kg
21. Neutron has mass equal to.......
(a) 1.6726 x 10⁻² kg
(b) 1.6022 x 10⁻¹⁹ kg
(c) 9.11 x 10⁻³¹ kg
(d) 1.67492 x 10⁻²⁷ kg
22. Atoms of same element having same atomic number but different atomic masses are called....
(a) Atomic Weight
(b) Isotopes
(c) Molar mass
(d) None of These
23. The nucleus of an atom consist of
(a) Protons and Electrons
(b) Neutron and Electrons
(c) Protons and Neutrons
(d) None of These
24. Quantum energy is directly proportional to
(a) Wave length
(b) Frequency
(c) Both
(d) None of These
25. Atomic nucleus is generally expressed in
(a) centimeter
(b) millimeter
(c) Angstrom
(d) None of These
26. Electron is .... times heavier than proton
(a) 1842
(b) 1600
(c) 1836
(d) None of These
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