Related Questions

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
A $${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months
B It will completely disintegrate in two months
C It will completely disintegrate in four months
D $${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months
240 radioactive grams of goo loses half its radioactivity every 10 days. How many grams of radioactive goo is left in 40 days?
A 120
B 60
C 15
D none
Which of the following is radioactive in nature?
A Oxygen
B Sulphur
C Tellurium
D Polonium
Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of
A Segar cones
B Muffles for muffle furnaces
C Insulating bricks
D Crucibles used for melting of high purity metals
Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature.
A Nylon
B Polyacrylonitrile
C Polypropylene
D Polyester
Which one is the radioactive isotope of hydrogen?
A Deuterium
B Ortho-hydrogen
C Tritium
D None of these
কোনো উদ্ভিদ বা প্রাণীর মৃত্যুকাল নির্ণয়ের জন্য নিম্নের কোন তেজস্ক্রিয় আইসোটোপ ব্যবহার করা হয়? (Which one of the following radioactive isotopes is used to determine how long before a plant or animal died?)
A C12
B C14
C U235
D I131
Which wonder of nature of Bangladesh did not participate in the voting of selecting in the list of New 7 Wondes of Nature?
A Cox's bazar Sea Beach
B Laoachora reserve Forest
C Ganga-Padma river
D Sunderban
Which wonder of nature is not in the list of Old 7 Wonders of Nature?
A Victoria Fall
B Grand Canyon
C Amazon Rain Forest
D Mount Everest
which wounder of nature is not in the list of New 7 wonders of Nature?
A Jeja Island
B Table Mountain
C Amazo Rein Forest
D Mount Everest

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