Radioactive decay
Radioactive decay is a Science & Technology concept from the MPSC syllabus, tested in 4 past MPSC questions across 4 exam years between 2019 and 2025. Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
📅 Today's Daily Challenge
Five fresh MPSC questions, the same for everyone today — free, no signup.
Asked in
What you need to know first
Real questions that test this
ट्रिटियमचे अर्धआयुष्य 12.5 वर्षे असून त्याचा बीटा किरणांनी क्षय होतोय. 25 वर्षानंतर मूळ ट्रिटियमचा किती अंश अक्षय शिल्लक राहील ? / Tritium has a half-life of 12.5 years, undergoing beta decay. What fraction of original Tritium will remain undecayed after 25 years ?
The half-life of tritium is 12.5 years. After 25 years, which is 2 half-lives (25 / 12.5 = 2), the remaining undecayed fraction is (1/2)² = 1/4 of the original amount.
_____________ या प्रक्रियेत न्यूट्रीनो कण उत्सर्जित होतो. Neutrino particle is emitted in the process of _____________.
During beta decay, a neutron transforms into a proton while emitting an electron (beta particle) and an antineutrino, or a proton into a neutron emitting a positron and a neutrino.
पुढील विधानांचा विचार करा : Consider the following statements :
(a)ऋण भारित बीटा कण हे धन भारित अल्फा कणपेक्षा जास्त अंतर्भेद करतात. / Beta particles are negatively charged and are more penetrating than Alpha particles, which are positively charged.
(b)उदासीन (धन अथवा ऋण नसलेले) गामा कण हे बीटा कणपेक्षा जास्त अंतर्भेद करतात. / Gamma particles are neutral and are more penetrating than Beta-particles.
(c)सर्वसाधारणपणे उदासीन कणांची (धन अथवा ऋण भारित नसलेले) अंतर्भेद शक्ती अत्युच्च असते. / In general neutral particles can be said to be having very high penetrating power.
Beta particles have higher penetrating power than Alpha particles due to smaller size/mass, and Gamma rays (neutral) have even higher penetration. Statements a and b are universally true.
खालील परिकल्पित अभिक्रिया पूर्ण करा : 235 92 U + 1 0 n -> x 54 Xe + y 38 Sr + 4 1 0 n
(a)x = 141, y = 91
(b)x = 139, y = 93
(c)x = 141, y = 93
(d)x = 139, y = 95
In nuclear fission of Uranium-235 bombarded by a neutron, mass numbers and atomic numbers must balance. Solving for standard fission fragments gives x = 141, y = 92 or 91 with varying neutron counts, fitting options (a) and (b).