12th class (Fsc) Physics unit 10 MCQs
chapter 10 MCQs 12th Class physics
Nuclear Physics:
1. The mass of β particle is equal to the mass:
a. Electron
b. Proton
c. Photon
d. Neutron
2. A positron is a particle having:
a. Mass equal to proton
b. Mass equal to electron
c. Mass equal to mass of electron but charge opposite to charge of electron
d. Change equal to electron
3. The SI unit of radiation dose is:
a. Grey
b. Roentgen
c. Rem
d. Curie
4. The number of Neutron in 238/92 U is:
a. 146
b. 92
c. 330
d. 238
5. The number of protons in any atom are always equal to the number of:
a. Positions
b. Neutrons
c. Mesons
d. Electrons
6. If the following particles have the same energy, which particle has the shortest
wavelength?
a. β-particle
b. α-particle
c. proton
d. neutron
7. Which of the following is similar to electron?
a. α-particle
b. β-particle
c. neutron
d. proton
8. The number of neutrons in 7/3Li are:
a. 4
b. 3
c. 2
d. 7
9. Mass of proton is:
a. 1.67×10-31kg
b. 1.67×10-27kg
c. 9.1×10-31kg
d. 1.6×10-19kg
10. How many times, the -particle is more massive than electrons?
a. 8332
b. 6332
c. 9332
d. 7332
11. In nuclear radiations, track of a-particle is:
a. Erratic
b. Thin
c. Continuous
d. Discontinuous
12. The number of isotopes of cesium are:
a. 22
b. 4
c. 36
d. 32
13. Both Xenom and cesium have:
a. 36 isotopes
b. 33 isotopes
c. 35 isotopes
d. 34 isotopes
14. When a nucleus emits alpha particle its atomic mass decreases by:
a. 3
b. 1
c. 4
d. 2
15. Gm-counter uses:
a. Argon
b. Alcohol only
c. Neon and bromine
d. Bromine
16. Number of isotopes of Neon gas are:
a. 4
b. 2
c. 1
d. 3
17. The building energy per nucleon is maximum for:
a. Polonium
b. Helium
c. Radium
d. Iron
18. A device that shows the visible path of ionizing particle is called:
a. Scalar
b. GM counter
c. Wilson cloud chamber
d. d state detector
19. The dead time of G.M tube is:
a. 10-4 sec
b. 10-3 sec
c. 10-8 sec
d. 10-6 sec
20. Binding energy for deuteron nucleus is given by:
a. 2.28 MeV
b. 2.8 MeV
c. 2.25 MeV
d. 2.23 MeV
21. 1 amu is equal to:
a. 1.66×10-34 kg
b. 1.66×10-24 kg
c. 1.66×10-27 kg
d. 1.66×10-19 kg
22. The dead time of Geiger-Muller counter is of the order of:
a. More than millisecond
b. Micro second
c. Nanosecond
d. Millisecond
23. Energy needed to produce an electron hole in solid state detector is:
a. 6 to 7 eV
b. 1 to 2 eV
c. 8 to 9 eV
d. 3 to 4 eV
24. Which is true for both a particle and Y-rays?
a. They can be deflected by magnetic field
b. They cause ionization if air
c. They can penetrate a few millimeters of aluminum
d. They can be deflected by electric field
25. When nitrogen is bombarded by alpha particles, nitrogen nucleus changes into:
a. Barium (Be)
b. Oxygen
c. Helium (He)
d. Carbon