171. In Wilson cloud chamber radiations become
visible reflection light from?
A. Ions
B. Nuclear
radiations
C. Droplets of fog
D. Glass
window
172. The track formed in the Wilson cloud chamber due to alpha particles is?
A. Thin and
broken line
B. Thick continuous line
C. Thick line
track in random direction
D. None
of above
173. The track formed the Wilson cloud chamber due to beta particles is?
A. Thin and broken line
B. Thick continuous
line
C. Whole region
exposed to radiations
D. None of
above
174. The spontaneous emissions of radiations
from heavy nucleus ( A > 83 ) is called?
A. Nuclear
fission
B. Nuclear Fusion
C. Radioactivity
D. None of
above
175. Alpha particles are?
A. Protons
B. Positrons
C. Negatively
charged
D. Helium nuclei
176. When a nucleus emit an Alpha particles
its charge number decreases by?
A. 3
B. 2
C. 6
D. 5
177. Beta particles are?
A. Protons
B. Electrons
C. Positrons
D. Neutrons
178. Beta particles, carries a charge?
A. 2e
B. +2e
C. -e
None of above
179. When a nucleus emits an alpha particle
its atomic mass decreases by?
A. 2
B. 1
C. 4
D. 3
180. Gamma rays carries a charge?
A. -e
B. +e
C. No charge
D. None of
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