Unit of radioactivity is _____________

(a)

roentgen

(b)

curie

(c)

becquerel

(d)

all the above

In which of the following reaction, the mass number decreases by four of the daughter nucleus?

(a)

\(\alpha\) decay

(b)

\(\beta\) decay

(c)

\(\gamma \) decay

(d)

neutron decay

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