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Practical Units - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main

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  • Practical units is considered one of the most asked concept.

  • 9 Questions around this concept.

Solve by difficulty

QuestionMEDIUM

Given below are two statements :
Statements I: Astronomical unit (Au), Parsec (Pc), and Light year (ly) are units for measuring astronomical
distances.
Statements II : Au < Parsec (Pc) < ly
In the light of the above statements, choose the most appropriate answer from the options given below :

View Solution

Concepts Covered - 1

Practical units

     

  1. Practical units of  length 

Name

Symbol

Conversion in m

1 fermi   

1 fm

10^{-15} m

1 X-ray unit

1 XU 

10^{-13}m

1 Angstrom  

1A^o

10^{-10}m

1 micron 

1 \mu m

10^{-6}m

1 Astronomical unit

1 AU

1.5 * 10^{11} m \approx 10^{8} k m

1 Light year

1 ly 

9.46 * 10^{15} m

1 Parsec 

1 Pc

3.26 light year

 

  1. Practical units of mass

 

Name

Symbol

Conversion in kilogram (Kg)

1 Chandra Shekhar Unit

1 CSU

2.8 * 10^{30} k g

= 1.4 times the mass of the sun

1 Metric tonne 

1 Metric tonne 

1000 kg

1 Quintal  

1 Quintal  

100 kg

1 Atomic mass unit

1 amu

1.67 * 10^{-27} k g

 

  1. Practical units of  Time 

  • 1 year =365.25 days =3.156 * 10^{7} Sec

  • Lunar Month- 29.53 days (29 days 12 hours and 44 minutes)  (It is the time taken by the moon to complete 1 revolution around the earth in its orbit or A lunar month is a duration between successive new moons)

  • Solar day-It is the time taken by the earth to complete one rotation about its axis with respect to Sun.

  • Sidereal day- It is the time taken by the earth to complete one rotation about its axis with respect to a distant star.

  • 1 Solar year- 366.25 sidereal days = 365.25 average solar day

  • 1 Average Solar Day=    \left (\frac{1}{365.25}^{th} \right ) part of the solar year

  • 1 solar second  = \left (\frac{1}{86400}^{th} \right )part of the mean solar day

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Practical units

Study other Related Concepts

Practical Units Current Topic

Physical Quantity
Fundamental And Derived Quantities And Units
System Of Unit
Practical Units
Dimensions Of Physical Quantities
Dimensionless Quantities
Applications Of Dimensional Analysis
Significant Figures
Errors Of Measurements

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