Unit of radioactivity is _____________

(a)

roentgen

(b)

curie

(c)

becquerel

(d)

all the above

In which of the following, no change in mass number of the daughter nuclei takes place
i) \(\alpha\) decay
ii) \(\beta\) decay
iii) \(\gamma \) decay
iv) neutron decay

(a)

(i) is correct

(b)

(ii) and (iii) are correct

(c)

(i) & ( iv) are correct

(d)

(ii) & (iv) are correct

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

Which of the following statements is/are correct?
i. \(\alpha\) particles are photons
ii. Penetrating power of \(\gamma \) radiation is very low
iii. Ionization power is maximum for α rays
iv. Penetrating power of \(\gamma \) radiation is very high

(a)

(i) & (ii) are correct

(b)

(ii) & (iii) are correct

(c)

(iv) only correct

(d)

(iii) & (iv) are correct

In the nuclear reaction ₆X¹² \(\overset { \alpha \ decay }{ \longrightarrow } \) _zY^A, the value of A & Z.

(a)

8, 6

(b)

8, 4

(c)

4, 8

(d)

cannot be determined with the given data