experimental methods used

The quadratic expression ax 2 + bx + c can be expressed in the form a(x 2 A 2 ) by the method of completing the square. The integrals can be evaluated by using the special integral..

Fractional distillation in a fractionating colum..

Module Two: Sampling and Experimentation - Overview of methods of data collection: Census Sample survey Experiment Observational study Planning and conducting surveys: Characteristics of a well-designed and well-conducted survey Populations, samples, and random selection Sources..

The rate of a reaction is determined by measuring the concentration of the reactant or product at different intervals of time. The concentration is measured, by measuring a related property such as color, pressure or volume (as in the case of gas phase reactions), pH, optical rotation, electrical c..

. When it is at rest, on placing the vibrating tuning fork on the sound box, the paper rider is found to vibrate vigorously and may be thrown off. The resonating length AC = L is measured using a metre scale. The experiment is repeated by gradually increasing the load W 2 in steps of 1Kgw..

This involves the use of some appropriate insects or some other organisms on the crop field having weeds. They selectively destroy the weed plants but do not harm the crop plants. Example: Cochineal insects are used to eradicate Opuntia weed (prickly pear). Aquatic weeds are co..

The biological method involves the use of some appropriate insects or some other organisms on the crop field having weeds. They selectively destroy the weed plants but do not harm the crop plants. Example: Cochneal insects are used to eradicate opuntia (a weed, common..

This method is used when the melting temperature of the metal is lower than that of the impurity and the impurities are not miscible with the metal. Metals like Bi, Sn, Pb, Hg etc., are purified by this method. The sloping floor of a reverberatory furnace is used..

In this type of contraception, a physical barrier is placed to prevent the entry of sperms into the uterus. It includes condoms (such as Nirodh) used by males, intrauterine device (IUD) and diaphragm cap used by females. IUD is commonly called loop and is inserted by a doctor..

Removal of weeds by mechanical methods are: pulling them out (uprooting) with hand removal by using a hoe or trowel interculture ploughing burning and floodin..