Some of the very old glass objects appear slightly milky instead of being transparent. Why ?
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Why does the sky appear dark instead of blue to an astronaut?
The sky appears dark instead of blue to an astronaut because there is no atmosphere in the outer space that can scatter the sunlight. As the sunlight is not scattered, no...
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The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them,
gravitational force between two objects is (a) F/4
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If a potted plant is covered with a glass jar, water vapours appear on the wall of glass jar. Explain why?
Hint—Because of transpiration
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Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.
We can see any object, when light reflected by that object reaches our eyes. But in the dark room, no light is reflected by the object so we are unable...
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Why common salt is sometimes yellow instead of being pure white ?
Due to the presence of electrons in some lattice sites in place of anions these sites act as F-centres. These electrons when excited impart colour to the crystal.
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When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies.
Rubbing produces charges of equal,magnitude but of opposite nature on the two bodies because charges are created in pairs. This phenomenon of charging is called charging by friction. The net...
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Why does the sky appear dark instead of blue to an astronaut
The sky appears dark instead of blue to an astronaut because there is no atmosphere containing air in the outer space to scatter sunlight. As there is no scattered light...
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Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:
Opaque : A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a...
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Some desert plants have very small leaves whereas some others have only spines. How does this benefit the plants?
These are adaptations to dry conditions. As a result of these modifications the surface of lamina is reduced thereby reducing water loss by transpiration.
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You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.
(i) By applying oil, grease, butter on it or pasting a butter paper on it. (ii) Grinding (rubbing) the surface of the glass by any abrasive material.
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