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System of unit - (Concept)
A complete set of units, for all kinds of physical quantities (both fundamental and derived ), is known as a system of units.
Types of System of unit
-
C.G.S. system- In this system, fundamental units are centimeter (cm), gram (g) and second (s).
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M.K.S. System- In this system, fundamental units are meter(m), kilogram(kg) and second (s).
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F.P.S. system- In this system foot(ft), pound(lb) and second(s) is used for measurement of length, mass and timerespectively.
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S.I. System- It is known as the International System of units. There are seven fundamental quantities in this system.
It is the modification of m.k.s system
|
Fundamental Quantity |
Fundamental Units |
Symbol |
|
Length |
meter |
m |
|
Mass |
Kilogram |
Kg |
|
Time |
second |
s |
|
Electric current |
Ampere |
A |
|
Temperature |
Kelvin |
K |
|
Amount of substance |
mole |
mol |
|
Luminous Intensity |
candela |
cd |
| Exam | Chapter |
| JEE MAIN | Physics and Measurement |
Choose the option which contains the correct pair of quantities with its fundamental unit in the SI system.
| A. |
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| B. |
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| C. |
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| D. |
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In the SI system fundamental unit for temperature is :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Match List - I with List - II.
|
List - I |
List-II |
|
|
|
Choose the most appropriate answer from the options given below :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
1 fermi meter is equal to how many Angstrom
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which of the following statements is true about the International System of Units (SI)?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which of the following is a disadvantage of using the British imperial system of units?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which of the following prefixes represents the largest value in the SI system?
| A. |
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| B. |
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| C. |
|
| D. |
|
Which of the following is a non-SI unit commonly used in the field of radiation?
| A. |
|
| B. |
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| C. |
|
| D. |
|
1 a.m.u. is equivalent to -
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In which system of units foot is unit of length-
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Temperature is a derived quantity in terms of -
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which of the following is a system of units?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Chandra Shekar unit is used to measure:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The density of wood is 0.5 gm/cc in the CGS system of units. The corresponding value in the MKS unit is............$ \mathrm{~kg} / \mathrm{m}^3$
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Young’s modulus of steel is $1.9 \times 10^{11} \mathrm{~N} / \mathrm{m}^2$. When expressed in CGS units of dynes/cm2, it will be equal to $n \times 10^{12}$, then value of n will be-
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The unit of density of a substance is -
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The weight per unit per volume of a substance is defined as
| A. |
|
| B. |
|
| C. |
|
| D. |
|
A complete set of these units, both the base units and derived units, is known as the system of units.
