5. Radioactivity

Question:

4 m.

1. Man-made radioactivity is also known as

(a) Induced radioactivity
(b) Spontaneous radioactivity
(c) Artificial radioactivity
Both (a) & (c)

2. Unit of radioactivity is

becquerel
roentgen
all the above
curie

3. Artificial radioactivity was discovered by

Bequerel
Roentgen
Irene Curie
Neils Bohr

4. In which of the following, no change in mass number of the daughter nuclei takes place?
(i) \(α\) decay
(ii) \(β\) decay
(iii) \(γ\) decay
(iv) neutron decay

(i) is correct
(ii) and (iii) are correct
(i) & ( iv) are correct
(ii) & (iv) are correct

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