Radio activation

41.	The substance used as both moderator and coolant in nuclear reactors is
	A. plain water
	B. heavy water
	C. liquid ammonia
	D. liquid hydrogen Option”B” is correct

42.	Radioactivity is measured by –
	A. Giger-Muller counter
	B. polarimeter
	C. calorimeter
	D. barometer Option”A” is correct

43.	On what principle does the hydrogen bomb work?
	A. controlled fission reaction
	B. uncontrolled fission reaction
	C. controlled fusion reaction
	D. uncontrolled fusion reaction Option”D” is correct

44.	‘Hydrogen Bomb’ was developed by –
	A. by Edward Taylor
	B. by Berner Bon Braun
	C. J. by Robert Oppenheimer
	D. by Samuel Cohen Option”A” is correct

45.	During which period does no change occur in a radioactive substance?
	A. β emission
	B. γ emission
	C. oxidation
	D. α emission Option”B” is correct

46.	Which of the following radio elements is used to measure the speed of blood flow in the human body?
	A. radio phosphorus
	B. radio iodine
	C. radio iron
	D. radio sodium Option”D” is correct

47.	In which order are the accelerating powers of α, β and γ in their descending order?
	A. α , β , γ
	B. γ , β , α
	C. β , α , γ
	D. γ , α , β Option”B” is correct

48.	Who discovered radioactivity?
	A. rutherford
	B. henry vacquerel
	C. roentgen
	D. Einstein Option”B” is correct

49.	Radioactivity is the property of
	A. of electron
	B. of proton
	C. of neutrons
	D. of nucleus Option”D” is correct

50.	participates in radioactive change
	A. valence electrons of an atom
	B. core electron of atom
	C. nucleus of an atom
	D. None of these Option”C” is correct

Pages: 1 2 3 4 5 6