LASERS MCQs 8 min Score: 0 Attempted: 0/8 Subscribe 1. . The corpuscular theory of light was put forward by (A) Einstein (B) Newton (C) Young (D) Max PlanckShow All Answers 2. . Neil Bohr put forward his theory in (A) 1887 (B) 1902 (C) 1917 (D) 1913Show All Answers 3. . When an electron goes from higher energy level to lower energy level it (A) Emits light (B) Does not emit light (C) Absorbs light (D) None of theseShow All Answers 4. . Laser is a device which can produce (A) All of these (B) Coherent light (C) Monochromatic light (D) An intense beam of lightShow All Answers 5. . The most widely used types of gas lasers are (A) All of these (B) Neon (C) Carbon dioxide (D) HeliumShow All Answers 6. . The meta-stable states of atoms are (A) Ground states of atom (B) De-excited atomic state (C) Excited atomic states of long period (D) None of theseShow All Answers 7. . The excited atoms return to their ground state in (A) 10⁻³ sec (B) 10⁻⁵ sec (C) 10⁻⁸ sec (D) 10¹⁵ secShow All Answers 8. . An atom can exist in meta-stable state for (A) 10⁻³ sec (B) 10⁻⁵ sec (C) 10⁻⁸ sec (D) 10⁻¹⁰ secShow All Answers
