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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
Artificial radioactive isotopes find application in
A Power generation
B Nucleonic devices
C Nuclear fission
D Medical field
Which of the following is artificially produced as it does not occur in nature?
A Uranium-235
B Uranium-233
C Plutonium-239
D Both B and C
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
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
__________ diffusion is used for separating the isotopes of methane.
A Thermal
B Pressure
C Concentration
D Force
Isotopes-
A আইসোটোপস হইল সই সমস্ত পরমাণু যাহাদের প্রোটন সংখ্যা সমান কিন্তু নিউট্রন সংখ্যা ভিন্ন
B একই মৌলের আইসোটোপস সমূহের ভিন্ন ভিন্ন ভর সংখ্যা থাকে
C একই মৌলের আইসোটোপস সমূহের রাসায়নিক ধর্ম একই রকমের
D সবকটি
Which one is different for the neutral atoms of the isotopes of an element?
A Number of electrons
B Atomic weight
C Atomic number
D Number of Protons
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
A 3 billion years
B 100 years
C 0.01 minute
D 13 days
Isotopes of same elements have
A Same atomic number and different masses
B Same chemical properties but different atomic numbers
C Different masses and different atomic numbers
D Different chemical properties and same atomic numbers

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