10th class physics unit 9 MCQs
chapter 9 MCQs 10th Class physics
Atomic and Nuclear Physics:
1. Isotopes are atoms of same element with different.
a. Number of protons
b. Atomic mass
c. Number of electrons
d. Atomic number
2. One of the isotopes of uranium 92 238U. the number of neutrons in this isotope is:
a. 238
b. 92
c. 330
d. 146
3. Proton is heavier than electron:
a. 1870 times
b. 1863 times
c. 1800 times
d. 1836 times
4. The number of isotopes of hydrogen is:
a. Four
b. Two
c. Five
d. Three
5. Atomic mass number can be found through the relation:
a. Z – A
b. Z + A
c. A + N
d. Z + N
6. In 92 235U the number 92 is:
a. Protons and neutrons
b. Protons
c. Neutrons and electrons
d. Neutrons
7. An isotope of Uranium is 92 238U . the number of neutrons in this isotope is:
a. 238
b. 92
c. 330
d. 146
8. When Uranium (92 protons) ejects a beta particle, then its number of protons will be:
a. 90
b. 93
c. 89
d. 91
9. Those number is equal in hydrogen?
a. Protons and neutrons
b. Protons and electrons
c. Electrons and neutrons
d. Protons
10. The number of neutrons in Tritium (1 3 H ) is:
a. Three
b. One
c. Four
d. Two
11. The number of neutrons in 6 12 C is:
a. 6
b. 18
c. 2
d. 12
12. The smallest particle of matter is called:
a. Element
b. Molecule
c. Compound
d. Atom
13. The word atom means:
a. Particle
b. Divisible
c. Matter
d. Indivisible
14. The central part of an atom is called:
a. Proton
b. Molecule
c. Electron
d. Nucleus
15. The charge on proton is:
a. Zero
b. Positive
c. No charge
d. Negative
16. The charge on electron is:
a. Zero
b. Positive
c. No charge
d. Negative
17. The charge on neutron is:
a. Zero
b. Positive
c. No charge
d. Negative
18. The number of protons in an atom is equal to its:
a. Nucleons
b. Atomic number
c. Neutron number
d. Atomic mass
19. The symbol to represent atomic number is:
a. A/Z X
b. Z
c. Z/A X
d. A
20. How many types of radiations emit during natural radioactivity?
a. Three
b. One
c. Four
d. Two
21. The phenomenon of natural radioactivity was first discovered by:
a. Henry Becquerel
b. Charles Coulomb
c. Einstein
d. Faraday
23. The elements which emit radiations are called:
a. Metals
b. Isotopes
c. Hydrocarbons
d. Radioactive elements
24. Radiations present in atmosphere due to different radioactive substances are called:
a. Primary radiations
b. Cosmic radiations
c. Secondary radiations
d. Background radiations
25. Which among the following radiations has more penetrating power?
a. An alpha particle
b. A beta particle
c. All have the same penetrating ability
d. A gamma ray
26. What happens to the atomic number of an element which emits one alpha particle?
a. Decreases by 2
b. Increases by 1
c. Decreases by 1
d. Stays the same
27. When uranium (92protons) ejects a beta particle, how many protons will be in the remaining nucleus?
a. 91
b. 89
c. 93
d. 90
28. Charge on alpha particle is:
a. Positive
b. Negative
c. Neutral
d. None of the above
29. Beta particle is actually:
a. Proton
b. Neutron
c. Positron
d. Electron
30. In SI, the unit for radioactivity is:
a. Watt
b. Bq
c. Mole
d. Joule
31. 1 Becquerel is equal to:
a. 1000 dps
b. 1 dps
c. 10 dps
d. 0.1 dps
32. During the nuclear transmutation of Radium-126, ……… is obtained along with alpha particle:
a. Carbon
b. Polonium
c. Barium
d. Radon
33. During the nuclear transmutation of Carbon-14, ……… is obtained alongwith beta particle:
a. Oxygen
b. Nitrogen
c. Helium
d. Boron
34. Alpha and beta particle combine to form ……… atoms:
a. Carbon
b. Boron
c. Hydrogen
d. Helium
35. The charge on alpha particle is:
a. 5e
b. 4e
c. 2e
d. 3e
36. Beta radiations are actually a stream of:
a. Neutrons
b. Protons
c. Alpha particles
d. Electrons
37. Which of the following radiations has more ionization power?
a. An alpha particle
b. A beta particle
c. All have the same penetrating ability
d. A gamma ray
38. The range of alpha particles in air is about:
a. Few kilometers
b. Few millimeters
c. Few centimeters
d. Few meters
39. The range of gamma rays in air is:
a. 2 km
b. 500 m
c. 3 km
d. 1 km
40. The half-life of a certain isotope is 1 day. What is the quantity of the isotope after 2days?
a. One-eighth
b. One half
c. One quarter
d. None of these
41. Half life of Carbon-14 is:
a. 45 years
b. 5730 years
c. 50 years
d. 30 years
42. Half life of lead is:
a. 10.2 hours
b. 10.6 hours
c. 10.00 hours
d. 10.4 hours
43. Half life of hydrogen is:
a. 30 years
b. 12.3 years
c. 2.85 years
d. 5730 years
44. Half life of radium-226 is:
a. 1620 years
b. 4000 years
c. 5730 years
d. 2800 years
45. Half life of cobalt is:
a. 20 years
b. 40 years
c. 30 years
d. 50 years
46. Half life of 53/131Iis:
a. 12.5 days
b. 10.5 days
c. .9 days
d. 8.07 days
47. Safe limit of radiation exposure is …… rem per year:
a. 6.0
b. 4.0
c. 7.0
d. 5.0
48. The rays used for brain radio therapy are:
a. Gamma rays
b. Alpha rays
c. X rays
d. Beta rays
49. ……… is used for the diagnose of brain tumor:
a. Potassium 40
b. Iodine 131
c. Carbon 14
d. Phosphorus 32
50. The isotope used for the monitoring of thyroid gland is:
a. Potassium 40
b. lodine 131
c. Carbon 14
d. Phosphorus 32
51. The isotope used for curing cancerous tumors and cells is:
a. Potassium 40
b. Iodine 131
c. Cobalt-60
d. Phosphorus 32
52. Carbon dating is an application of:
a. Background radiation
b. Natural radioactivity
c. Cosmic radiation
d. Radioisotope
53. When a heavy nucleus splits into two lighter nuclei, the process would:
a. Release chemical energy
b. Release nuclear energy
c. Absorb chemical energy
d. Absorb nuclear energy
54. During fission reaction, the newly borne atoms are called:
a. Nuclear products
b. New elements
c. Fission products
d. Fission fragments
55. Nuclear fission was firstly observed in:
a. 1939
b. 1935
c. 1930
d. 1937
56. During a fission reaction, how many neutrons are emitted?
a. 2.47
b. 3
c. 2.473
d. 2.4
57. In nuclear fission reaction, the total mass of the products is always ……… the original mass of the heavy nucleus:
a. Equal to
b. Greater than
c. Less than
d. None
58. The energy released during each fission reaction is about:
a. 300 MeV
b. 200 MeV
c. 400 MeV
d. 250 MeV
59. The energy released by burning 1 ton of coal is about:
a. 3.6 x 1010
b. 3.6 x 108
c. 3.6 x 1012
d. 3.6 x 109
60. The energy released by burning 1 kg of uranium is about:
a. 6.7 x 1011
b. 6.7 x 1012
c. 6.7 x 109
d. 6.7 x 1010
61. Release of energy by the sun is due to
a. Burning of gases
b. Nuclear fission
c. Chemical reaction
d. Nuclear fusion
62. The temperature of Sun at its center is:
a. 24 million Kelvin
b. 20 million Kelvin
c. 25 million Kelvin
d. 2 million Kelvin
63. The process in which two light nuclei combine a heavier nucleus is called:
a. Nuclear fission
b. Nuclear transmutation
c. Nuclear fusion
d. Natural radioactivity
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