1. . The physical properties of an atom is related to
(A) nucleus
(B) electron
(C) proton
(D) neutron
2. . The spontaneous emission of radiations from certain elements is called
(A) radioactivity
(B) half life
(C) isotopes
(D) uranium-235
3. . The radioactive elements are
(A) stable
(B) unstable
(C) radioactivity
(D) half life
4. . For artificial radioactivity elements are broken down
(A) stable
(B) half life
(C) radioactivity
(D) unstable
5. . Alpha rays carry a charge
(A) positive
(B) negative
(C) neutral
(D) zero
6. . Beta rays are actually fast moving
(A) Nucleus
(B) electron
(C) proton
(D) neutron
7. . Rays have no charge and mass as well
(A) alpha
(B) beta
(C) no one
(D) gamma
8. . Rays are more powerful than x-rays
(A) gamma
(B) beta
(C) alpha
(D) no one
9. . The disintegration of radioactive elements into their half quantity is called
(A) new life
(B) old life
(C) half life
(D) lifeless
10. . Fission means
(A) to break
(B) to add
(C) to waste
(D) to acquire
11. . Fusion means
(A) to break
(B) to waste
(C) to add
(D) to acquire
12. . One atom of uranium-235 emits neutron on breaking
(A) 1
(B) 2
(C) 3
(D) 4
13. . The transformation of one element into another is only possible in ______ reactions
(A) Fission
(B) Fusion
(C) Nuclear
(D) Neutral
14. . All isotopes are
(A) radioactive
(B) fusion
(C) stable
(D) half life