Embibe Experts Solutions for Chapter: Physical World and Measurement, Exercise 1: Level 1

The physics behind fusion test reactor is:

Which of the following is a possible final step in applying the scientific method?

Match the columns I and II

The correct match is

The angular speed of a fly-wheel making $180 \mathrm{rpm}$ is ________

The commutator bracket $\left[XY,Z\right]$ is expanded as

Consider a physical quantity, $Z$ expressed as $Z=\frac{A{B}^{\frac{1}{2}}}{C^2}.$ If the relative error in the magnitudes of $A\mathit{,} B$ and $C$ is $1\%$ then the relative error in $Z$ will be, 

A student measured the diameter of a small steel ball using a screw gauge of least count $0.001 \mathrm{cm}.$ The main scale reading is $5 \mathrm{mm}$ and zero division of the circular scale coincides with $25$ divisions above the reference level. If the screw gauge has a zero error of $-0.004 \mathrm{cm}.$ the correct diameter of the ball is__________

The distance of a circle is $2.486 \mathrm{m}$. Its area with due regard to signifiant figures is (Given $\pi =3.142$)