NDA Government Jobs Exams

Two atoms are said to be isotopes if -
(a) they have the same atomic number but different mass numbers
(b) they have the same number of neutrons but different mass numbers
(c) the sum of the number of protons and neutrons is the same, but the number of protons is different
(d) they have the same number of neutrons but different modes of radioactive decay

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a) they have the same atomic number but different mass numbers
4 years agoHelpfull: Yes(0) No(0)

NDA Other Question

Consider the following statements about Periyar E. V. Ramaswamy –
1. He was a politician, social activist and an important figure in the Dravidian movement in South India
2 He championed the cause of caste upliftment, nationalism and the rights of women
3. He was contemporary of the Maharashtran anti-cast reformer, Jotiba Phule
Which of the statements given above is/are correct ?
(a) 1 only (b) 3 only (c) 1 and 3 (d) 1 and 2 The phenomenon of radioactivity was discovered by -
(a) Marie Curie (b) Pierre Curie (c) Henri Becquerel (d) J. J. Thomson