the cause for the genetic disease? . What is the amount of radiation that may cause death of a person when exposed to it? .
When and where was the first nuclear reactor built? . Give the SI unit of radioactivity. .
Which material protects us from radiation? X. Answer the following questions in few sentences. .
Write any three features of natural and artificial radioactivity. . Define critical mass. .
Define one roentgen. . State Soddy and Fajan’s displacement law. .
Give the function of control rods in a nuclear reactor. . In Japan, some of the new born children are having congenital diseases. Why?
. Mr. Ramu is working as an X - ray technician in a hospital. But, he does not wear the lead aprons.
What suggestion will you give to Mr. Ramu? . What is stellar energy?
. Give any two uses of radio isotopes in the field of agriculture? XI. Answer the following questions in detail.
. Explain the process of controlled and uncontrolled chain reactions. . Compare the properties of alpha, beta and gamma radiations.
. What is a nuclear reactor? Explain its essential parts with their functions. XII.
HOT Questions: . Mass number of a radioactive element is and its atomic number is . When this element undergoes certain nuclear reactions, it transforms into an isotope of lead with a mass number and an atomic number . Determine the number of alpha and beta decay that can occur.
. 'X – rays should not be taken often'. Give the reason. .
Cell phone towers should be placed far away from the residential area – why? REFERENCE BOOKS . Physics concepts and connections – by Art Hobson Edition: Pearson education . Modern Physics – by Dr.
R Murugesan & Er. Kiruthiga Sivaprasath – S. Chand publications INTERNET RESOURCES