Units of Measurement - Length and Mass

Since, we know that SI unit of energy is represented by Joule. Hence, let us convert all the different units in the form of Joules.

Angstrom, fermi and parsec are the units of length whereas barn is the unit of nuclear cross-section. 

Distance between earth and sun - Light year
Interatomic distance in a solid - Angstrom
Size of a nucleus - Fermi
Wavelength of infrared laser - Micron

1) Conductance (G) is reciprocal of resistance (R).

Answer is B

We know that $1{\buildrel _{\circ}\over{\mathrm{A}}}=10^{-10} m$

We know that  $1 \ g = \dfrac{1}{1000} \ kg$
Also,  $1\ cm = \dfrac{1}{100} \ m$
Thus   $1g/cm^3 = 1 \ g\times\dfrac{1  \ kg}{1000 \ g}\times \dfrac{1}{1 \ cm^3}\times \dfrac{(100)^3 \ cm^3}{1 \ m^3} = 1000 \ kg/m^3$

We know that:

The slug is the unit of  mass in the US common system of units. 

Here, quintal and ton both are the unit of mass. 

The metric ton is a unit of mass and one metric tone is equal to $1000$ kilograms.

Slug is the unit of mass in US common system of units. It is a mass which accelerates by $1\ ft/s^2$ when a one pound force is applied.   

When a body moves from one planet another the gravitational force acting on it changes but mass remains the same. Hence mass on earth and on the moon of any object is the same.

We know that, $1$ miligram (mg) $=10^{-3}$ gram

We know that, $1$ quintal $=100\ kg$

In the metric system, distance is measured in meter.

Millimeters, centimeters and meters are the metric units of length and inches is the non-metric unit of length.

Millimeters, centimeters and meters are the metric units of length whereas feet, yards and miles are the non-metric units of length.

The size of a ladybug is very small, of the order of centimeters. Thus centimeters is the best scale for measuring the length of a ladybug.

The quantity g is acceleration due to gravity (m/s^2) and G is the universal gravitational constant (N m^2/kg^2). The ratio g/G has units (m/s^2) / (N m^2/kg^2) = (m/s^2) * (kg^2 / (kg m/s^2 * m^2)) = kg/m^2.

A light year is defined as the distance that light travels in a vacuum in one Julian year. Despite having 'year' in the name, it is a unit of length, not time.

Advantage :

1) It is easy available and invariable

2) It is well defined and does not change with locations, temperature, time, pressure etc

Radian is not the unit of length it is the unit of angle.

Metre is the SI unit of length.

$1$ square centimeter $=(10^{-2})^2 m^2=10^{-4} m^2$

Length $l=7.6m$

Nanometre or $nm$ is a unit of length in the metric system. $1\ nm=10^{-9}\ m$.

The unified atomic mass unit (symbol: $u$) is the standard unit that is used for indicating mass on an atomic or molecular scale (atomic mass).

In M.K.S. system of units, mass is measured in kilogram (Kg). Thus the given statement is true.

S.I. base unit of mass is kilogram represented by kg.

The SI unit of mass is kg, CGS unit of mass is g (gram). Newton is the SI unit of force. 

Metre is the SI unit used for measuring the distance which is defined taking speed of light as a reference.

When a force of 1 N produced an acceleration of $\displaystyle 1{ m }/{ { s }^{ 2 } }$ in a body, then the mass of body is said to be 1 kg.(definition)

The kilogram, defined as the mass of one cubic decimeter of water at $4^o C$ is known as kilogram of the Archives.

Platinum-iridium is the standard that is kept at the International Bureau of Weights and Measures (BPIM).

Ampere, Mole and Candela are linked through their definitions to the mass of the platinum-iridium cylinder stored in a vault near Paris.

1 milligram (mg) = $10^{-3}$ gram (g)