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State two applications of universal law of gravitation.
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State the universal law of gravitation. Name the scientist who gave this law.
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State and explain Kepler's laws of planetary motion. Draw diagrams to illustrate these laws.
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Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don’t we notice such forces ? Why don’t the two objects in a room move towards each other due to this force ?
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Which type of cell division is required for growth and repair of body and which type is involved in formation of gametes?
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A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?
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Which characteristics of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
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The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
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When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?
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Which single term is used to describe the mixing of copper sulphate and water kept in a beaker, on its own?
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Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation?
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When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?
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A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be taken into small particles by hammering. Which characteristic of the particles of matter is illustrated by these observations?
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What is the general name of :
- rigid form of matter ?
- fluid forms of matter ?
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Fill in the following blank with suitable words :
The smell of perfume gradually spreads across a room due to .....................
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State two characteristics of matter demonstrated by diffusion.
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Explain why, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.
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Explain the following :
When an incense stick is lighted in the corner of a room, its fragrance spreads quickly in the entire room.
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What are the common objectives of crop improvement?
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What is meant by 'diffusion'? Give one example of diffusion in gases.
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