10th Samacheer Quiz

Q1. What is half-life?

Time for half the initial radioactive nuclei to decay Time for all nuclei to decay Time for temperature to halve Time for atomic weight to double

Q2. Which radiation is deflected most strongly by a magnetic field?

Beta Alpha Gamma All equally

Q3. What is the charge of a beta-minus particle?

−e +2e +e 0

Q4. The nucleus contains protons and neutrons.

Protons and neutrons Electrons only Photons only Molecules only

Q5. How is the number of neutrons calculated?

N = A − Z N = A + Z N = Z − A N = A/Z

Q6. In beta-minus decay, how does atomic number change?

Increases by 1 Decreases by 1 Decreases by 2 Remains unchanged

Q7. What is the charge on an alpha particle?

+2e −2e +e 0

Q8. Who discovered radioactivity?

Henri Becquerel Isaac Newton J. J. Thomson Niels Bohr

Q9. Atoms with the same atomic number but different mass numbers are called:

Isotopes Isobars Isotones Isomers

Q10. What is nuclear fission?

Splitting of a heavy nucleus into smaller nuclei Combining two light nuclei Emission of electrons Reflection of light

Nuclear Physics