Radio activation

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

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

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

34.	The number of protons in the stable nucleus of an atom is
	A. equal to the number of neutrons
	B. more than the number of neutrons
	C. less than the number of neutrons
	D. none of these Option”C” is correct

35.	unit of radioactivity is
	A. angstrom
	B. candela
	C. Fermi
	D. Curie Option”D” is correct

36.	What emits radioactive element
	A. ultraviolet rays
	B. α , β and γ radiation
	C. radio waves
	D. infrared waves Option”B” is correct

37.	Who discovered alpha and beta rays
	A. Dalton
	B. roentgen
	C. rutherford
	D. willard Option”C” is correct

38.	Which scientist discovered γ rays
	A. Willard
	B. rutherford
	C. roentgen
	D. Dalton Option”B” is correct

39.	Which of the following radioactive ray is equivalent to helium nucleus?
	A. α ray
	B. β ray
	C. γ ray
	D. None of these Option”A” is correct

40.	Which has the highest velocity potential in the radiation coming out of the nucleus?
	A. in α ray
	B. in β ray
	C. in γ ray
	D. None of these Option”C” is correct

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