". VdoTips: Science Multiple Choice Questions

Science Multiple Choice Questions

11. Sky looks blue because the sun light is subjected to __________.
(A).Rayleigh scattering
(B).Compton scattering
(C).Both
(D).None
12. Luminescence is because of
(A).Photons emitted while excited electrons drops down
(B).Knocking out of electrons by photons
(C).Photons stimulated by photons
(D).All
13. Fluorescence occurs within _______.
(A).10-5 s.
(B).10-5 ms.
(C).10-5 µs.
(D).10-5ns.
14. Electro-luminescence occurs in _________.
(A).Electrical conductors
(B).Electrical insulators
(C).p-n junctions
(D).all
15. Pyrometer works based on
(A).Laser technology
(B).Photo-conduction
(C).Thermal emission
(C).Tyndall effect