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201) The Refractive index of Diamond is 2.41
202) Density of diamond is 3.51gm/cm3
203) Density of graphite is 2.25gm/cm3
204) Third form of carbon is discovered in 1996 by
“HW.KROTO”; “Resmasy”. C60.
205) Distance between two layers in graphite is 3.35Ao
206) C-C bond length is 1.42 A⁰ in graphite.
207) C-C bond length is 1.52 Ao in diamond.
208) Radioactivity was discovered by Henry
Bequerel in 1896.
209)To avoid overturning of a vehicle moving on a curved
road , the height of center of gravity of vehicle must be nearer to the ground.
210)When a spin bowler throws a cricket ball towards the
batsman , the center of mass of ball follows a parabolic path.
211) Newton’s laws of motion apply only to centre of mass.
212) A body is heated uniformly keeping it on a smooth
surface . the position of center of mass wrt that body does not change in
position.
213)Two balls are thrown simultaneously in air the
acceleration of centre of mass of those two balls in air is equal to ‘g’.
214)If two particles initially at rest approach each other
due to mutual force, they two meet at center of mass of system.
215) The center of mass of Earth and moon describes elliptical
path.
216)When a person walks on a rough road , the frictional
force exerted by the road on him is along his direction of motion.
217) Less mileage is obtained per litre of fuel by a car
making frequent stops. Here st each time of starting it has to overcome static
friction.
218) Small brake and large brake both are equally effective
in stopping a cycle as friction doesn’t depend on area of contact.
219)Coefficient of friction can be greater than 1.
220)When a person walks on a rough surface reaction of force
applied by a man on surface keeps him
moving.
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