What makes something radioactive?

elements with an atomic number above 81

Which particles make up the nucleus of an atom?

electrons, protons, and neutrons

A radioactive source emits radiation that can pass through a sheet of paper but not through thick aluminium. What does this show about the radiation?

It is a mixture of alpha-particles and gamma-rays

Radioactivity Class 12 MCQ Questions With Answers Quiz

14.

A nuclear chain reaction occurs when

Three neutrons are absorbed by other uranium-235 nuclei and continue the reaction repeatedly.

Three neutrons are released from protons of radioactive elements and the reaction continues repeatedly.

An atomic bomb releases enough energy to start a hydrogen bomb.

Nuclei of smaller atoms join together to form larger nuclei

1.

The weakest radioactive emission is

2.

Which type of radioactive decay is occurring in this equation?

3.

A radioactive nuclide has a ____ stable nucleus than a non-radioactive nucleus of the same element.

4.

What makes something radioactive?

5.

An unstable nucleus has 145 neutrons and 92 protons. It emits a β-particle.How many neutrons and protons does the nucleus have after emitting the β-particle?

6.

A narrow beam of alpha-particles is fired at a thin piece of gold foil.Which is the final direction of the largest number of alpha-particles?

7.

The equation shows the decay of the nuclide X:What are the values of P and Q ?

8.

Which line in the table describes the nature of an alpha-particle and a gamma-ray?

9.

A radioactive nucleus R decays with the emission of a β-particle as shown:Which equation is correct?

10.

Radon has a half-life of 4 days. How long does it take for 16 grams of radon to be reduced to 2 grams of radon?

11.

What is the number of protons that the element in this image contain?

12.

Which type of radiation has particles partially made of neutrons?

13.

Name the instrument used to detect radioactivity.

14.

A nuclear chain reaction occurs when

15.

Alpha radiation or waves were found to be streams of charged particles that were identical in mass and charge to atomic nuclei of which element?

16.

Which particles make up the nucleus of an atom?

17.

Fusion occurs when nuclei

18.

A radioactive source emits radiation that can pass through a sheet of paper but not through thick aluminium. What does this show about the radiation?

19.

Which particles are negatively charged

20.

This particle determines what element you have - the elements identity.

21.

Describes radioactive element decay

22.

Which radiation carries no charge

23.

Which radiation would be repelled by a positive charge?

24.

Which of these particles are the nucleus of a helium atom

25.

A detector is used to measure the count-rate near a radioactive source. The reading is 4000counts per minute. After 30 minutes the count-rate has fallen to 500 counts per minute.What is the half-life of the radioactive source? You may ignore the effects of backgroundradiation.

Time

1. The weakest radioactive emission is

2. Which type of radioactive decay is occurring in this equation?

3. A radioactive nuclide has a ____ stable nucleus than a non-radioactive nucleus of the same element.

4. What makes something radioactive?

5. An unstable nucleus has 145 neutrons and 92 protons. It emits a β-particle.How many neutrons and protons does the nucleus have after emitting the β-particle?

6. A narrow beam of alpha-particles is fired at a thin piece of gold foil.Which is the final direction of the largest number of alpha-particles?

7. The equation shows the decay of the nuclide X:What are the values of P and Q ?

8. Which line in the table describes the nature of an alpha-particle and a gamma-ray?

9. A radioactive nucleus R decays with the emission of a β-particle as shown:Which equation is correct?

10. Radon has a half-life of 4 days. How long does it take for 16 grams of radon to be reduced to 2 grams of radon?

11. What is the number of protons that the element in this image contain?

12. Which type of radiation has particles partially made of neutrons?

13. Name the instrument used to detect radioactivity.

14. A nuclear chain reaction occurs when

15. Alpha radiation or waves were found to be streams of charged particles that were identical in mass and charge to atomic nuclei of which element?

16. Which particles make up the nucleus of an atom?

17. Fusion occurs when nuclei

18. A radioactive source emits radiation that can pass through a sheet of paper but not through thick aluminium. What does this show about the radiation?

19. Which particles are negatively charged

20. This particle determines what element you have - the elements identity.

21. Describes radioactive element decay

22. Which radiation carries no charge

23. Which radiation would be repelled by a positive charge?

24. Which of these particles are the nucleus of a helium atom

25. A detector is used to measure the count-rate near a radioactive source. The reading is 4000counts per minute. After 30 minutes the count-rate has fallen to 500 counts per minute.What is the half-life of the radioactive source? You may ignore the effects of backgroundradiation.

Time

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1.

The weakest radioactive emission is

2.

Which type of radioactive decay is occurring in this equation?

3.

A radioactive nuclide has a ____ stable nucleus than a non-radioactive nucleus of the same element.

4.

What makes something radioactive?

5.

An unstable nucleus has 145 neutrons and 92 protons. It emits a β-particle.How many neutrons and protons does the nucleus have after emitting the β-particle?

6.

A narrow beam of alpha-particles is fired at a thin piece of gold foil.Which is the final direction of the largest number of alpha-particles?

7.

The equation shows the decay of the nuclide X:What are the values of P and Q ?

8.

Which line in the table describes the nature of an alpha-particle and a gamma-ray?

9.

A radioactive nucleus R decays with the emission of a β-particle as shown:Which equation is correct?

10.

Radon has a half-life of 4 days. How long does it take for 16 grams of radon to be reduced to 2 grams of radon?

11.

What is the number of protons that the element in this image contain?

12.

Which type of radiation has particles partially made of neutrons?

13.

Name the instrument used to detect radioactivity.

14.

A nuclear chain reaction occurs when

15.

Alpha radiation or waves were found to be streams of charged particles that were identical in mass and charge to atomic nuclei of which element?

16.

Which particles make up the nucleus of an atom?

17.

Fusion occurs when nuclei

18.

A radioactive source emits radiation that can pass through a sheet of paper but not through thick aluminium. What does this show about the radiation?

19.

Which particles are negatively charged

20.

This particle determines what element you have - the elements identity.

21.

Describes radioactive element decay

22.

Which radiation carries no charge

23.

Which radiation would be repelled by a positive charge?

24.

Which of these particles are the nucleus of a helium atom

25.

A detector is used to measure the count-rate near a radioactive source. The reading is 4000counts per minute. After 30 minutes the count-rate has fallen to 500 counts per minute.What is the half-life of the radioactive source? You may ignore the effects of backgroundradiation.