QUIZ 4-NUCLEI (RADIOACTIVITY PARTICLES)

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1. Which word equation represents β or β- decay?

neutron →proton + electron + neutrino

neutron →proton + positron + neutrino

neutron →proton + electron + antineutrino

neutron →proton+ positron + antineutrino

2. In the Uranium radioactive series the initial nucleus is ₉₂U²³⁸ and that the final nucleus is ₈₂Pb²⁰⁶ , when uranium nucleus decays to lead, the number of α- particle and beta -particle emitted are

6 alpha ,8 beta

4 alpha ,3 beta

6 alpha ,7 beta

8 alpha ,6 beta

3. In gamma rays emission from a nucleus

both the proton number and neutron number changes

only the neutron no changes

only the proton number changes

there is no change in the proton number and neutron number

4. The process responsible for energy production is the Sun/Star is

Nuclear fission

Nuclear fusion

chemical reaction

Radio activity

5. Which statement about alpha, beta and gamma radiation is correct?

Beta radiation has the greatest ionizing power.

Gamma radiation has the greatest ionizing power.

Alpha radiation has the greatest ionizing power.

Alpha, beta and gamma radiation have nearly equal ionizing powers.

6. In β or β- decay

Atomic number increases by 1, mass number remains same

Atomic number decreases by 1, mass number remains same

Atomic number remains same, mass number increases by 1

Atomic number remains same, mass number decreases by 1

7. Which word equation represents β+ decay?

proton →neutron + positron + antineutrino

proton →neutron + electron + neutrino

proton →neutron + electron + antineutrino

proton →neutron + positron + neutrino

8. In β+ decay of a nucleus

Atomic number increases by 1, mass number remains same

Atomic number remains same, mass number decreases by 1

Atomic number remains same, mass number increases by 1

Atomic number decreases by 1, mass number remains same

9. In reaction:
₄Be⁹ + ₂He^₄ → ₆C^x + ₀n¹ , x=

10. The nucleus formed by the β decay of the ₁₁Na²²is an ,

₁₁Na²²

Isotope

Isobar

Isotone

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