Questions in Units and Measurements

Select	Question
	According to Joule's law of heating, heat produced $H = {I^2}$Rt, where I is current, R is resistance and t is time. If the errors in the measurement of I, R and t are 3%, 4% and 6% respectively then error in the measurement of H is
	If there is a positive error of 50% in the measurement of velocity of a body, then the error in the measurement of kinetic energy is
	A physical quantity P is given by P=$\frac{{{A^3}{B^{\frac{1}{2}}}}}{{{C^{ - 4}}{D^{\frac{3}{2}}}}}$. The quantity which brings in the maximum percentage error in P is
	If $L = 2.331\,cm,\;B = 2.1\,cm$, then $L + B =$
	The number of significant figures in all the given numbers 25.12, 2009, 4.156 and $1.217 \times {10^{ - 4}}$ is
	If the length of rod A is $3.25 \pm 0.01$ cm and that of B is $4.19 \pm 0.01$ cm then the rod B is longer than rod A by
	A physical quantity is given by $X = {M^a}{L^b}{T^c}$. The percentage error in measurement of $M,L$and T are $\alpha ,\beta $and $\gamma $ respectively. Then maximum percentage error in the quantity X is
	A physical quantity A is related to four observable $a,b,c$ and d as follows, $A = \frac{{{a^2}{b^3}}}{{c\sqrt d }}$, the percentage errors of measurement in $a,b,c$ and d are 1%,3%,2% and 2% respectively. What is the percentage error in the quantity A
	Light year is a unit of
	The magnitude of any physical quantity