Systems of Unit and Units in S.I. System

Draw a neat labelled diagram of the vernier callipers. Name its main parts and state their functions.

A vernier callipers has a zero error $+0.06 \mathrm{cm}$. Draw a neat labelled diagram to represent it. 

A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be $1.4 \mathrm{mm}$. If the zero error of the vernier callipers is $+0.02 \mathrm{cm}$, what is the correct thickness of pencil?

A microscope is provided with a main scale graduated with $20$ divisions in $1\mathrm{cm}$ and a vernier scale with $50$ divisions on it of length same as that of $49$ divisions of main scale. Find the least count of the microscope.

A vernier has $10$ divisions and they are equal to $9$ divisions of the main scale in length. If the main scale is calibrated in $\mathrm{mm}$, what is its least count?

A stop watch has $10$ divisions graduated between $0-5 \mathrm{s}$ marks. What is its least count?

Name the part of the vernier callipers which is used to measure the thickness of a pencil.

Name the part of the vernier callipers which is used to measure the depth of a small bottle.

Name the part of the vernier callipers which is used to measure the internal diameter of a mug.

Name the part of the vernier callipers which is used to measure the external diameter of a tube.

State three uses of Vernier Callipers.

The mass of an oxygen atom is $16.00 \mathrm{u}$. Find its mass in $\mathrm{kg}$.

Which of the following unit is not a fundamental unit?

The fundamental unit is :

$1 \mathrm{amu}=\mathrm{\_\_\_\_\_} \mathrm{kg}$

$1 \mathrm{quintal}=\mathrm{\_\_\_\_\_} \mathrm{kg}$.

$1 \mathrm{mg}=\mathrm{\_\_\_\_\_} \mathrm{kg}$.

$1 \mathrm{g}=\mathrm{\_\_\_\_\_} \mathrm{kg}$

Name two units of mass smaller than $a \mathrm{kilogram}$. How are they related to $\mathrm{kilogram}$?

Name two units of mass bigger than $a \mathrm{kilogram}$. How are they related to $\mathrm{kilogram}$?