1. . Mass of a nucleus is of the order of:
(A) 10⁻¹⁹ kg
(B) 10⁻²⁹ kg
(C) 10⁻³¹ kg
(D) 10⁻²⁴ kg
2. . Mass of a proton is:
(A) 9.10 × 10⁻³¹ kg
(B) 1.67 × 10⁻³¹ kg
(C) 1.67 × 10⁻²⁷ kg
(D) 1.67 × 10⁻¹⁷ kg
3. . The unified mass is based on rest mass of an atom of carbon and is equal to:
(A) 12 Units
(B) 10 Units
(C) 15 Units
(D) 7 Units
4. . One a.m.u is equal to:
(A) 1.66 × 10²⁶ kg
(B) 1.66 × 10²⁵ kg
(C) 1.66 × 10⁻²⁷ kg
(D) 1.66 × 10⁻²⁸ kg
5. . Elements showing radioactivity have atomic number:
83')"> (A) Z > 83
83')"> (B) Z > 72
83')"> (C) Z < 72
83')"> (D) Z < 83
6. . Gamma rays consist of a stream of:
(A) Electrons
(B) Protons
(C) Positrons
(D) Photons
7. . Fission chain reaction is controlled by introducing:
(A) Graphite rod
(B) Platinum rods
(C) Cadmium
(D) Boron rods
8. . First atomic reactor was introduced by:
(A) Rutherford
(B) Wilson
(C) Enrico Fermi
(D) Curie