For the determination of 'g' using a simple * pendulum, measurements of l and T are required. Error in 'the measurement of which of these will have larger effect on the value of 'g' thus obtained and why? What is done to minimize this error?

What is the % error in measurement of T of a pendulum if maximum errors in measurements of length and ‘g’ are 2% and 4% respectively ?

A physical quantity P is related to four observables a, b, c and d as follows: P=( a^3b^2 )/(sqrtcd) The percentage errors of measurement in a, b, c and d are 1%,3%, 4% and 2%, respectively. What is the percentage error in/the quantity P? If the value of P calculated using the above relation turns out to be 3.763, to what value should you round off the result?