Embibe Experts Solutions for Chapter: Physical World and Measurement, Exercise 8: Exercise (Conceptual Questions)

The radius of sphere is measured as $\left(2.1\pm 0.5\right) \mathrm{cm}$. Its surface area with error limits is $\left(\alpha \pm \beta \right) {\mathrm{cm}}^2$. Find the value of $\left(\alpha -\beta \right)$.

Which of the following system of units is not based on units of mass, length and time alone?

Density of wood is $0.5 \mathrm{g}{ \mathrm{cm}}^{-1}$ in C.G.S. system of units. The corresponding value in SI units is

Which relation is wrong?

A unitless quantity

Which of the following pairs do not match :-

Ton is the unit of

L, C and R represent physical quantifies inductance, capacitance and resistance respectively. The combination representing dimension of frequency is :