Under what circumstances the use of office machines are economical?
Modern business houses depend too much on machines because these are labour and time saving devices. The use of machines in office becomes economical when:
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In which office geographical filing is useful ?
Under geographical filing, the classification is done on the basis of geographical origin of a document. Here classification of records is done on the basis of area-wise, state-wise and country-wise. In geographical filing, the following steps are maintained:
What is the use of a Thermometer ?
Mercury expands on heating and contracts on cooling. We can place the thermometer in the mouth under the tongue or in the armpit for about one minute. The expansion of mercury along the scale gives us the temperature of the body.
What is a Stethoscope used for ?
The doctor wants to know about the working of lungs and the heart before treating a patient. He or she can do it easily with the help of a simple instrument called the stethoscope. It was invented by Rene Laennec.
Write a short note on the adverse effect of use of Pesticides
The pesticides and herbicides which are widely used in agriculture have no doubt increased agricultural output. Chemically these are chlorinated hydrocarbons and organophosphates.