Nuclear physics iv. No chain reaction takes place in an atom bomb a. (i) only correct b. (i) & (ii) are correct c.
(iv) only correct d. (iii) & (iv) are correct II. Fill in the blanks . One roentgen is equal to disintegrations per second .
Positron is . . Anemia can be cured by isotope . Abbreviation of .
used to measure exposure rate of radiation in humans. . has the greatest penetration power. .
Z Y A → Z+ Y A + X ; Then, X is . Z X A → Z Y A This reaction is possible in decay. . The average energy released in each fusion reaction is about J.
. Nuclear fusion is possible only at an extremely high temperature of the order of K. . The radio isotope of helps to increase the productivity of crops.
. If the radiation exposure is R, it may cause . III State whether the following statements are true or false: If false, correct the statement . Plutonium - is a fissionable material.
. Elements having atomic number greater than can undergo nuclear fusion. . Nuclear fusion is more dangerous than nuclear fission.
. Natural uranium U- is the core fuel used in a nuclear reactor. . If a moderator is not present, then a nuclear reactor will behave as an atom bomb.
. During one nuclear fission on an average, to neutrons are produced. . Einstein’s theory of mass energy equivalence is used in nuclear fission and fusion.
a. Radio Iodine b. Radio Cobalt c. Radio Carbon d.
Radio Nickel . Gamma radiations are dangerous because a. it affects eyes & bones b. it affects tissues c.
it produces genetic disorder d. it produces enormous amount of heat . aprons are used to protect us from gamma radiations a. Lead oxide b.
Iron c. Lead d. Aluminium . Which of the following statements is/are correct?
i. α particles are photons ii. Penetrating power of γ radiation is very low iii.