LASERS MCQs 8 min Score: 0 Attempted: 0/8 Subscribe 1. . The corpuscular theory of light was put forward by: (A) Einstein (B) Max Planck (C) Young (D) NewtonShow All Answers 2. . Neil Bohr put forward his theory in: (A) 1887 (B) 1902 (C) 1913 (D) 1917Show 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) An intense beam of light (B) Coherent light (C) Monochromatic light (D) All of theseShow All Answers 5. . The most widely used types of gas lasers are: (A) Helium (B) Neon (C) Carbon dioxide (D) All of theseShow All Answers 6. . The metastable states of atoms are: (A) Excited atomic states of long period (B) De–excited atomic state (C) Ground states of atom (D) None of theseShow All Answers 7. . The excited atoms return to their ground state in: (A) 10⁻⁸ sec (B) 10⁻⁵ sec (C) 10⁻³ sec (D) 10⁻¹⁰ secShow All Answers 8. . An atom can exist in metastable state for: (A) 10⁻⁵ sec (B) 10⁻³ sec (C) 10⁻⁸ sec (D) 10¹⁵ secShow All Answers
