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Dorling Kindersley Science Encyclopedia Work/Review Sheets
RADIOACTIVITY
Read each question and circle the letter of the best answer.
NOTE: Some questions may have more than one "correct" answer - think carefully about what you have read, and choose the most complete one.
1.What does the word "nuclei" (noo-clee-eye) mean?
A) A brand of eye drops. B) The plural form of "nucleus". C) The eye of a nuclear storm. D) A, B & C.
2.Most atoms have stable nuclei. What does that mean?
A) Their number of neutrons & protons stays the same. B) They are not radioactive. C) They do not split. D) A, B & C.
3.Which of the following is true of atoms with unstable nuclei?
A) They can split. B) They are radioactive. C) They are called "radioisotopes". D) A, B & C.
4.What are the three types of radiation given out by radioisotopes?
A) They are all three dangerous to living things. B) alfa, beta and gamma. C) AM, FM and short-wave. D) A, & B.
5.Which is the least harmful form of radiation?
A) Alpha - can be stopped by paper B) Beta - can be stopped by metal C) Gamma - can only be stopped by thick lead or concrete D) A, B& C.
6.The rate of radioactive decay is called the "half life". What does this mean?
A) The time it takes for half the atoms in a radioactive substance to decay. B)The time it takes to cut an atom in half. C) The time it takes for it to damage half of someone's cells. D) A, B & C.
7.Sometimes radiation can be put to good use. Which of the following are positive uses of radiation?
A) Heart pacemaker batteries. B) Cancer detection and treatment. C) Smoke alarms. D) A, B & C.
8.What is the name of the device that German Physicist, Hans Geiger invented to measure radiation?
A) Radiometer. B) Geiger counter. C) The R.A.D. -Radiation Amount Detector. D) A, B & C.
9.A terrible nuclear disaster happened in April of 1986. Where did this take place?
A) Chicago, Illinois. B) Chenowyth, United Kingdom. C) Chernobyl, Ukraine. D) A, B & C.
10.Why is it so important for workers who handle radioactive substances to be very careful?
A) Radiation can kill. B) Radiation can build up over time. C) They could endanger themselves and others. D) A, B & C.
11.What is the name of the process used to determine the age of something by measuring carbon-14 decay?
A) Carbon paper B)Carbon dating. C) Carbon copies. D) A, B & C.
12.Why does it work?
A) No one actually knows B)Magic. C) Animals and plants contain a known proportion of Carbon-14. D) A, B & C.
What more can you say about MATTER now?________________________________________________________________________________
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Matter07 ©1999-2000 Sassafrass Grove Homeschool
NOTE: These work/review/related-activity sheets are for use with the DK Science Encyclopedia as a 12 part science study. The first portion of the initial section, "Matter" is presented here. More will be added as time permits. If you find errors or see need for additions, please contact us at the e-mail address provided at the bottom of this page.
This site and these worksheets are in no way associated with nor endorsed by Dorling Kindersley.
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