fourth grade science practice

Practical Applications of Reflection of Sound - Some applications of the principle of reflection of sound are: Megaphone Hearing Board Sound Board..

Bats and dolphins can detect the presence of an obstacle by hearing the echo of the sound produced by them. This process is called sound rangin..

This is a purely commercial forestry, which is developed to fulfill the needs of the various forest-based industries requiring large quantities of raw materials. This type of plantation is done on land, which is not being used for any agricultural practices..

The unit 'watt' is very small. Therefore, in actual practice we use a much larger unit called 'kilowatt'. It is equal to 1000 watt..

The public must be educated to take the following preventive measures against AIDS. A disposable or new razor should be used at the hair dresser's Blood donors must be screened for HIV before they donate blood Only disposable needles and syringes should be used Safe sex must be pra..

According to Newton's first law of motion every body continues to be in its state of rest or uniform motion along a straight line unless an external force acts on it. This means that a ball moving on a horizontal surface should continue to move indefinitely as no force is acting on it. But pra..

Force of Friction - According to Newton's first law of motion every body continues to be in its state of rest or uniform motion along a straight line unless an external force acts on it. This means that a ball moving on a horizontal surface should continue to move indefinitely as no force is acting..

Mixed Farming - While modern day farmers specialize in one agricultural sector, either dairy or growing potatoes, their predecessors kept a wide array of farm animals and planted many different kinds of field crops. Their farms were remarkably self sufficient, producing eggs, meat, milk, vegetables..

While modern day farmers specialize in one agricultural sector, either dairy or growing potatoes, their predecessors kept a wide array of farm animals and planted many different kinds of field crops. Their farms were remarkably self sufficient, producing eggs, meat, milk, vegetables and grains for ..

Commercial Unit of Electrical Energy - The unit 'watt' is very small. Therefore, in actual practice we use a much larger unit called 'kilowatt'. It is equal to 1000 watts. Since electrical energy is the product of power and time, watt hour (W h) can also be considered as unit of electric ..