9th Class Chemistry Chapter no.2 MCQs
Unit no.2 MCQs of 9th Class Chemistry
Structure of Atoms:
1. Which one of the following result in the discovery of proton
a. X-rays
b. Cathode rays
c. Alpha rays
d. Canal rays
2. Which one of the following are the most penetrating particles?
a. Neutrons
b. Protons
c. Alpha particles
d. Electrons
3. The concept of orbit of atom was used by:
a. Bohr
b. J.J Thomson
c. Planck
d. Rutherford
4. Who discovered proton?
a. Neil Bohr
b. Gold stein
c. Rutherford
d. J.J Thomson
5. Who discovered neutron?
a. Rutherford
b. William Crooks
c. Chedwick
d. Bohr
6. Canal rays are produced in discharge tube due to:
a. Cathode
b. Anode
c. Excess pressure of gas
d. Ionization of gas molecules
7. Father of nuclear science is:
a. Max Plancks
b. Neil Bohr
c. J.J Thomson
d. Rutherford
8. Who discovered cathode rays?
a. Sir William Crooks
b. Goldstein
c. Neil Bohr
d. John Dalton
9. Charge on cathode rays is:
a. Neutral
b. Negative
c. Ionic bond
d. Positive
10. Which of the following particles have more penetrating ability in matter?
a. Neutrons
b. Protons
c. Alpha particles
d. Electrons
11. Charge on neutrons is:
a. Positive
b. Negative
c. Partial positive
d. None
12. Charge on atom is:
a. Neutral
b. Positive
c. -2 2-
d. Negative
13. The concept of atom was given by:
a. Goldstein
b. Bohr
c. Chedwick
d. Dalton
14. In 1897, electron was discovered by:
a. Dalton
b. J.J. Thomson
c. Chedwick
d. Bohr
15.The plum pudding theory was given by:
a. Dalton
b. J.J. Thomson
c. Chedwick
d. Bohr
16 . In glass tube during the discovery of electron, the pressure inside the discharge tube was kept:
a. 10-6 atm
b. 10 atm
c. 104 atm
d. 10-4 atm
17 . J.J. Thomson was awarded Noble prize in Physics for the discovery of:
a. Electron
b. Proton
c. Alpha particles
d. Neutron
18 . The charge/mass ratio was discovered by:
a. Dalton
b. J.J. Thomson
c. Chedwick
d. Bohr
19 . The cathode rays travel in a:
a. Circle
b. Curve
c. Along y-axis
d. Straight line
20 . The mass of proton is ……… times that of an electron:
a. 1844
b. 1836
c. 1846
d. 1840
21 .The mass of neutron is ……… that of proton:
a. Equal
b. Greater
c. Not equal
d. Smaller
22. Rutherford used in his experiment to present atomic model:
a. Gold foil
b. Paper foil
c. Iron sheet
d. Silver foil
23. The thickness of gold foil used in Rutherford’s experiment was:
a. 0.004 cm
b. 0.00004 cm
c. 0.0004 cm
d. 0.00004mm
24. Most of the volume occupied by an atom is:
a. Negative
b. Filled
c. Empty
d. Positive
25. The central part of an atom is called:
a. Electron
b. Nucleus
c. Neutron
d. Proton
26. The electrons present ……… the nucleus:
a. Around
b. Inside
c. Inside protons
d. Outside
27. Rutherford belonged to:
a. New Zealand
b. Ireland
c. Germany
d. Switzerland
28. Rutherford won the Noble prize in:
a. Chemistry
b. Physics
c. Compounds
d. Biology
29. Rutherford won the Noble prize in:
a. 1910
b. 1905
c. 1908
d. 1911
30. Rutherford proposed the nuclear model of the atom in:
a. 1910
b. 1905
c. 1908
d. 1911
31. Neil Bohr was a ……… physicist:
a. British
b. American
c. Danish
d. European
32 . Neil Bohr joined Rutherford in:
a. 1912
b. 1910
c. 1913
d. 1911
33. Bohr presented the model of atom in:
a. 1912
b. 1910
c. 1913
d. 1911
34. Neil Bohr won the Noble prize in:
a. 1922
b. 1920
c. 1923
d. 1921
35. Neil Bohr won the Noble prize in:
a. Biology
b. Physics
c. Science
d. Chemistry
36. When an electron jumps from lower orbit to higher orbit, it ……… the energy:
a. Wastes
b. Release
c. Uses
d. Absorbs
37. When an electron jumps from higher orbit to lower orbit, it ……… the energy:
a. Wastes
b. Releases
c. Uses
d. Radiates
38. What is the value of Planck’s constant in simple terms:
a. 6.63 x 10-34 Js
b. 6.673 x 10-34 Js
c. 6.53 x 10-34 Js
d. 2.23 x 10-34 Js
39. The value of angular momentum of the electron moving
in an orbit is:
a. mvr=π2nh
b. mvr=nh2π
c. mvr=n2π3h
d. mvr=n2πh
40. In mvr=nh2π, n represents number of:
a. Electrons
b. Orbits
c. Quantum
d. Both B and C
41. The base of Rutherford’s atomic theory was:
a. Classical
b. Quantum
c. Functional
d. Orbital
42. The base of Bohr’s atomic theory was:
a. Classical
b. Quantum
c. Functional
d. Orbital
43. According to Rutherford’s atomic theory, atoms should produce ……… spectrum:
a. Transparent
b. Line
c. Circular
d. Continuous
44. According to Bohr’s atomic theory, atoms should produce ……… spectrum:
a. Transparent
b. Line
c. Circular
d. Continuous
45. Max Planck won the Noble prize in:
a. 1915
b. 1916
c. 1918
d. 1920
46. Max Planck belonged to:
a. Britain
b. France
c. Germany
d. Chemistry
47. Max Planck won the Noble prize in the field of:
a. Math
b. Physics
c. Biology
d. Chemistry
48. Which one of the following shell consists of three subshells?
a. L shell
b. O shell
c. M shell
d. N shell
49. The p subshell has:
a. Three orbitals
b. One orbital
c. Four orbitals
d. Two orbitals
50. How many electrons can M shell accommodate?
a. 18
b.2
c. 32
d. 8
51. How many electrons can N shell accommodate?
a. 18
b. 2
c. 32
d. 8
52. The number of sub shells in N shell is:
a. 4
b. 2
c. 5
d. 3
53. How many electrons can P shell accommodate?
a. 6
b. 2
c. 18
d. 4
54. Which of the following shell consists of four sub shell?
a. M shell
b. K shell
c. N shell
d. L shell
55. Of which noble gas, chlorine attains the electronic configuration after attaining one electron?
a. Argon
b. Helium
c. Krypton
d. Neon
56. General Electronic configuration of carbon family is:
a. ns2 np3
b. ns2 np1
c. ns2 np2
d. ns2 np4
57. Which molecule requires two electrons to complete its valence shell?
a. NH3
b. N2
c. BF3
d. O2
58. The number of electrons in the valence shell of noble gases is:
a. 2 or 4
b. 2 or 8
c. 2 or 10
d. 2 or 6
59. The number of sub shells in K shell is:
a. 3
b. 1
c. 4
d. 2
60. Atomic number of calcium is:
a. 19
b. 11
c. 20
d. 12
61. Electronic configuration of hydrogen is:
a. 1s2,2s1
b. 1s2,2s2
c. 1s1
d. 1s2
62. Electronic configuration of halogen family is:
a. ns2 .np4
b. ns2
c. ns2 .np5
d. ns2 .np3
63. How many electrons can K shell accommodate?
a. 18
b. 2
c. 32
d. 8
64. Which radioisotope is used for the diagnosis of tumor in the body?
a. Strontium-90
b. Cobalt-60
c. Phosphorous-32
d. Iodine-131
65. When U-235 breaks up, it produces:
a. Protons
b. Electrons
c. Nothing
d. Neutrons
66. Deuterium is used to make:
a. Soft water
b. Light water
c. Hard water
d. Heavy water
67. The isotopes C-12 is present in abundance of:
a. 98.9%
b. 96.9%
c. 99.7%
d. 97.9%
68. Isotope used to generate electricity in nuclear reactor is:
a. Co-60
b. C-12
c. P-32
d. U-235
69. Which of the following is used for the treatment of cancer?
a. I-131
b. P-32
c. Co-60
d. Sr-90
70 . Isotopes of hydrogen are:
a. 3
b. 1
c. 4
d. 2
71. Helium He2+ nuclei is:
a. Gamma particle
b. Alpha particle
c. Neutral particle
d. Beta particle
72. Isotopes of carbon are:
a. 4
b. 2
c. 5
d. 3
73. Isotopes of carbon are:
a. 4
b. 2
c. 5
d. 3
74. Isotope of uranium are:
a. 4
b. 2
c. 5
d. 3
75. The 23892U is found in nature nearly:
a. 98%
b. 95%
c. 99%
d. 96%
76. In isotopes the different term is:
a. Protons
b. Atomic number
c. Electrons
d. Mass number
77. Number of neutrons in protium are:
a. 2
b. 0
c. 3
d. 1
78. Number of neutrons in deuterium are:
a. 2
b. 0
c. 3
d. 1
79. Number of neutrons in tritium are:
a. 2
b. 0
c. 3
d. 1
80. The naturally occurring hydrogen is formed by the combination of:
a. Tritium
b. Protium
c. Deuterium
d. All
81. The isotope used for the treatment of skin cancer is:
a. Co-60
b. C-12
c. P-32
d. U-235
82. The isotope used for geological purposes is:
a. Co-60
b. C-14
c. P-32
d. U-235
83. The number of neutrons in potassium atom is:
a. 39
b. 19
c. 18
d. 20
Click here to go directly on chapter no.3