JEMTEC

Rainwater harvesting (RWH) is one of the simplest methods by which rainwater is collected and stored for future generations. The collected rainwater may be  utilised  in different ways like cleaning, washing and many more other way or can be directly used for recharging of underground water tables. In the present scenario it is the primary requirement to harvest rain water otherwise we will be without water very soon. As the planning commission mentioned Delhi will be water -less by the end of 2020, if we do not manage our water resources. With the depleting groundwater tables and change of climate pattern, rain water harvesting can go a long way to help mitigate these effects. Collecting the rainwater can help recharge underground water tables, reduce flooding and ensure the water availability in dry zones. Some of the rainwater harvesting methods which have been practiced in ancient India like   aharpynes ,  madakas ,  surangas ,  taankas etc ....

In this blog I introduce the following key terms used for finding the level of questions set by an examiner in an examination and the perception of the students about it. These terms are the facilitation value and the discrimination value. 1.        Introduction A.       Facilitation Value : The facilitation value of a question indicates how easy the question is. The facilitation value is calculated by using the following formula. FV= (RU + RL)(2xN*marks of test item) Where N= no. of students in a group. The value is chosen as 30% of the total students from top scorer and 30% of students from low scorers. RU = sum of marks obtained by upper group RL = sum of marks obtained by lower group When FV=1 means that all students in lower group and all students in upper group answered the test item. So it can be so assumed that the test item was very easy.   When FV=0, means nobody answered the question, it means tha...