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 meta-stable 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) 10¹⁵ secShow All Answers 8. . An atom can exist in meta-stable state for (A) 10⁻⁵ sec (B) 10⁻³ sec (C) 10⁻⁸ sec (D) 10⁻¹⁰ secShow All Answers
