Radioactive decay is a __________ change. September 7, 2025 by Admin chemical nuclear physical none of these ✅ The correct answer is option B.
The new nucleus formed after β-decay of a radioactive element has September 7, 2025 by Admin less atomic number less atomic weight more atomic number more atomic weight ✅ The correct answer is option A.
The size of an atom is of the order of one September 7, 2025 by Admin °Angstrom fermi micron mm ✅ The correct answer is option A.
The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight. September 7, 2025 by Admin 1-Feb 1-Apr 1-Aug Jan-16 ✅ The correct answer is option D.
Fission of U-235 on slow neutron bombardment can be represented by September 7, 2025 by Admin 92U235 + 3 γ1 56Ba143 + 36Kr90 92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1 92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1 + Q (energy) 92U235 + 0n1 92U236 + 30n1+ Q (energy) ✅ The correct answer is option C.
The main ore of uranium is September 7, 2025 by Admin pitchblende monazite sand cassiterite chalcopyrite ✅ The correct answer is option A.
Moderating material used in a thermal-reactor should be a September 7, 2025 by Admin good absorber of neutrons. solid substance. poor absorber of neutrons. none of these. ✅ The correct answer is option C.
Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at September 7, 2025 by Admin Alwaye (in Kerala) Jadugoda (in Jharkhand) Kalpakkam (in Tamilnadu) Gopalpur coast (in Orissa) ✅ The correct answer is option B.
The main ore of thorium is September 7, 2025 by Admin pitchblende monazite sand limonite galena ✅ The correct answer is option B.
Nuclides having the same atomic numbers are termed as September 7, 2025 by Admin isotopes isomers isotones isobars ✅ The correct answer is option B.