Man-made radioactivity is also known as

_____________

• Induced radioactivity

• Spontaneous radioactivity

• Artificial radioactivity

• a & c

Unit of radioactivity is _____________

• roentgen

• curie

• becquerel

• all the above

Artificial radioactivity was discovered by

____________

• Bequerel

• Irene Curie

• Roentgen

• Neils Bohr

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

____________ isotope is used for the

treatment of cancer.

• Radio Iodine

• Radio Cobalt

• Radio Carbon

• Radio Nickel

Gamma radiations are dangerous because

• it affects eyes & bones

• it affects tissues

• it produces genetic disorder

• it produces enormous amount of heat

_____________ aprons are used to protect

us from gamma radiations

• Lead oxide

• Iron

• Lead

• Aluminium

Which of the following statements is/are

correct?

i. α particles are photons

ii. Penetrating power of γ radiation is very low

iii. Ionization power is maximum for α rays

iv. Penetrating power of γ radiation is very high

• (i) & (ii) are correct

• (ii) & (iii) are correct

• (iv) only correct

• (iii) & (iv) are correct

Proton - Proton chain reaction is an example of

__________________

• Nuclear fission

• α - decay

• Nuclear fusion

• β - decay

In the nuclear reaction

₆X¹² α decay _ZY^A

the value of A & Z.

• 8, 6

• 8, 4

• 4, 8

• cannot be determined

  with the given data