Radioactivity
ICSE · Class 10 · Physics
Most important questions from Radioactivity for ICSE Class 10 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.
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Which of the following are properties of beta particles? (Select all correct answers)
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They are fast-moving electrons, They have negative charge, They deflect in magnetic field
Beta particles are fast-moving electrons with negative charge (-1.6×10⁻¹⁹C) and small mass (9.1×10⁻³¹kg). They deflect in electric and magnetic fields due to their charge.
Which radiation has the highest penetrating power?
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Gamma rays
Gamma rays have the highest penetrating power as they are electromagnetic waves with no charge and no mass, allowing them to pass through most materials easily.
In nuclear fission, uranium-235 typically splits into how many fragments?
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Two nearly equal fragments
In nuclear fission, uranium-235 splits into two nearly equal fragments (like Barium and Krypton) along with neutrons and releases about 200 MeV energy.
Which safety equipment should be used when handling radioactive materials? (Select all correct answers)
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Lead aprons, Lead gloves, Long handle lead tongs, Film badges
Safety equipment includes lead aprons and gloves for protection, lead tongs for handling, and film badges to monitor radiation exposure. Lead is used because it effectively blocks radiation.
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