Answer, Guyezzššš (1)Ozone layer in the upper atmosphere is due to the reactions of (A)carbon dioxide and oxygen (B)oxygen and ultraviolet rays (C)infra-red rays and ultraviolet rays (D)carbon dioxide and layers of atmosphere (2)Electromagnetic theory was proposed by (A)Max Planck (B)Huygens (C)Newton (D)Maxwell (3)The working principle of a washing machine is (A)reverse osmosis (B)diffusion (C)centrifugation (D)dialysis (4)Ball bearings are used in cycles, scooters etc to (A)Increase the friction between the wheel and the axle (B)Reduce the friction between the wheel and the axle (C)Reduce the friction between ground and the wheel (D)None of the above (5)The splitting of different colours of light in a prism is (A)Refraction of light (B)Diffraction of light (C)Dispersion of light (D)Reflection of light (6)Optical fiber works on the principle of (A)scattering (B)interference (C)total internal reflection (D)refraction (7)The colour of an opaque object is due to the color it (A)refracts (B)absorbs (C)scatters (D)reflects (8)In case of uniform circular motion, the acceleration is (A)Variable in magnitude but constant in direction (B)Constant in magnitude and directed radially inwards (C)Variable in magnitude but tangential to the circle (D)Zero
Posted on: Sun, 06 Jul 2014 14:47:34 +0000
Trending Topics
Recently Viewed Topics
© 2015