The M.K.S. system of units also falls under the metric system and is very similar to the S.I. unit. The SI succeeded the M.K.S. system and followed the same units with more fundamental quantities. The full form M.K.S. is a metre-kilogram-second system of units, where the unit of length is metre, unit of mass is kilogram and unit of time is second. This system also has other derived units with length, mass, and time as the base units. The M.K.S.Q system is a meter-kilogram-second-charge system, where the dimensional representation of charge is represented with Q. If the dimensional representation of the charge is represented in terms of current and time then M.K.S.A system is used where A is ampere.

Velocity v and acceleration a in two systems of units 1 and 2 are related as v 2 = n m 2 v 1 and a 2 = a 1 m n respectively. Here m and n are constants. The relations for distance and time in two systems respectively are

n 3 m 3 L 1 = L 2 and n 2 m T 1 = T 2

L 1 = n 4 m 2 L 2 and T 1 = n 2 m T 2

L 1 = n 2 m L 2 and T 1 = n 4 m 2 T 2

n 2 m L 1 = L 2 and n 4 m 2 T 1 = T 2

Match the physical quantities with their correct SI units. List-I List-II (A) Planck's constant (I) kg m s - 2 (B) Torque (II) kg - 1 m 3 (C) Weight (III) m 2 kg s - 1 (D) Specific volume (IV) kg m 2 s - 2 The correct match is

A = III , B = IV , C = I , D = II

A = II , B = IV , C = I , D = III

A = IV , B = I , C = II , D = III

A = II , B = III , C = I , D = IV

A unit for a measurement of a physical quantity is a chosen standard of the same kind taken as a reference in order to measure it. Hence, to measure a physical quantity, it is compared with an internationally accepted reference standard called unit.

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What is MKSQ system?

Important Questions on Units and Measurements

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The prefix atto means

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Match List I with List II

	List I		List II
A	Torque	I	$kg m^{- 1} s^{- 2}$
B	Energy density	II	$kg m s^{- 1}$
C	Pressure gradient	III	$kg m^{- 2} s^{- 2}$
D	Impulse	IV	$kg m^{2} s^{- 2}$

Choose the correct answer from the options given below :

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Pick out the stranger

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Physics>Mechanics>Units and Measurements>The International System of Units

In SI units,

kg m^{2} s^{- 2}

is equivalent to which of the following?

EASY

Physics>Mechanics>Units and Measurements>The International System of Units

The units nanometer and picometer are related as,

MEDIUM

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A huge circular arc of length $4.4 ly$ subtends an angle $4 s$ at the centre of the circle. How long it would take for a body to complete $4$ revolution if its speed is $8 AU$ per second?
Given : $1 ly = 9.46 \times 10^{15} m$

$1 AU = 1.5 \times 10^{11} m$

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The angle of

1'

(minute of arc) in radian is nearly equal to

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Plane angle and solid angle have:

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The angular speed of a fly-wheel making

180 rpm

is ________

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Physics>Mechanics>Units and Measurements>The International System of Units

The distance of the Sun from earth is

1.5 \times 10^{11} m

and its angular diameter is

2000''

when observed from the earth. The diameter of the Sun will be

MEDIUM

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Velocity

(v)

and acceleration

(a)

in two systems of units

1

and

2

are related as

v_{2} = \frac{n}{m^{2}} v_{1}

and

a_{2} = \frac{a_{1}}{m n}

respectively. Here

m

and

n

are constants. The relations for distance and time in two systems respectively are

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Physics>Mechanics>Units and Measurements>The International System of Units

If $E$ and $H$ represents the intensity of electric field and magnetizing field respectively, then the unit of $\frac{E}{H}$ will be:

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Physics>Mechanics>Units and Measurements>The International System of Units

Light year is a unit of

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Physics>Mechanics>Units and Measurements>The International System of Units

Match the physical quantities with their correct $SI$ units.

	List-I		List-II
(A)	Planck's constant	(I)	$kg m s^{- 2}$
(B)	Torque	(II)	${kg}^{- 1} m^{3}$
(C)	Weight	(III)	$m^{2} kg s^{- 1}$
(D)	Specific volume	(IV)	$kg m^{2} s^{- 2}$