Question
What is meant by 'celestial objects'? Name any three celestial objects.
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Answer
The stars, the planets, the moon and many other objects in the sky are called celestial objects. The moon is the brightest object in the night sky. Stars are celestial bodies that emit light of their own. Our sun is also a star. Moon is the natural satellite of the Earth. The Sun and the celestial bodies which revolve around it form the solar system. These celestial bodies include the planets, comets, asteroids and meteors.
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→(i) What does Watson's activity show ?
$\quad$(a) Liquids exert pressure.
$\quad$(b) Liquids contract on cooling.
$\quad$(c) Liquids cannot be compressed.
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$\quad$1. at same depth
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$\quad$3. with same strength
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(iii) Pressure exerted by liquids at the bottom depends on
$\quad$(a) width of the liquid column
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$\quad$(d) height of the liquid column
(iv) Which of the following does not affect the pressure beneath the surface of a liquid ?
$\quad$(a) Strength of the gravitational field
$\quad$(b) Area of the liquid
$\quad$(c) Density of the liquid
$\quad$(d) Depth of the liquid
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