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Answer 1

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( i ) The only effective way to lighten the color of wood after it has been stripped of all surface coatings is to use a wood bleach. Sanding does help to lighten wood in many cases, but this only applies to surface soil or grime, and even then only if the discoloration has not penetrated very deeply.

( ii ) Silkworm.

( iii ) second.

The base unit of time in the International System of Units (SI) and by extension most of the Western world, is the second, defined as about 9 billion oscillations of the caesium atom.

( iv ) Distance-Time Graph for Uniform Motion.

A body is said to be in uniform motion when the body covers the equal distance in equal time intervals. ... As in uniform motion, the distance time graph would be a straight line, because the equal distance is covered in equal units of time.

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