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Online General Science Quiz Set No - 26

General Science questions have been taken from previous years question papers of different competitive examinations such SSC CGL, SSC CHSL, CDS, NDA, Bank, State PSC, Railways, MAT, CAT, etc.

251) The first synthetic fibre made by man was:
A) Rayon
B) Nylon
C) Polyester
D) Terycott

252) The focal length of a convex lens is?
A) the same for all colours
B) maximum for yellow light
C) shorter for blue light than for red
D) shorter for red light than for blue

253) The forward resistance of a diode is?
A) Very small
B) Very large
C) Infinity
D) Zero

254) The freezing point of fresh water is
A) 0 degree celsius
B) 4 degree celsius
C) 3 degree celsius
D) 5 degree celsius

255) The function of sedimentation tank in sewage treatment is to?
A) Remove water content
B) Aerate the sewage
C) Remove suspended solids
D) Disinfect the sewage

256) The fundamental scientific principle in the operation of a battery is
A) Acid-base interaction
B) Dialysis
C) Dissociation of electrolytes
D) Oxidation-reduction

257) The gas liberated during the reaction of copper with dilute nitric acid is:
A) NO2
B) N2O5
C) O2

258) The gas used to extinguish fire is:
A) Neon
B) Nitrogen
C) Carbon dioxide
D) Carbon Monoxide

259) The gas usually causing explosions in coal mines is:
A) Hydrogen
B) Carbon monoxide
C) Air
D) Methane

260) The gas usually filled in electric bulb is:
A) Hydrogen
B) Oxygen
C) Nitrogen
D) Carbon di-oxide