Power of Focus for students by Sandeep Maheshwari

Give one significant contribution of the following scientist : P. Maheshwari

Sandeep has a wooden study table. He wants to measure the height of the table. Which of the following tools can be used by Sandeep to measure the height of his study table?

A student focussed the leaf epidermal peel under the low power of microscope but could not see all the parts. He should:

At simple interest Gaurav borrows Rs. 1,500 from Sandeep at the rate of 14% per annum. What amount of money should Gaurav pay to Sandeep after 1 year to clear the debt ?

Vaibhav can do a piece of work in 60 days. He works there for 15 days and then Sandeep alone finishes the remaining work in 30 days. In how many days will Vaibhav and Sandeep working together finish the work?