Chapters

Physical Quantities

A physical quantity is a quantity that can be measured like length, mass, time, temprature, area, volume and density etc. Physical quantites are of two types

  1. Basic physical quantities
  2. Derived physical quantities

 

Basic physical quantities

Physical quantities which are independent of other physical quantites are known as basic physical quantaties. Their are 7 basic physical quantites:-

Mass, Length, Time, Luminous Intensity, Temprature, Electric Current and amount of substance.
Basic physical quantities are also known as Fundamental Physical Quantites.

  1. Mass (Kilogram): Kilogram is the SI UNIT (International System of Units) of mass. Kilogram is denoted by the symbol kg, gram is denoted by g and milligram by mg, 1mg=1/1000 gram and 1 gram=1/1000 kg.

  2. Length (Metre): Metre is the SI UNIT of length. A metre is the length of path travelled by light in vaccuum during the time interval of 1/299792458 of a second. 1 km=1000 metres, 1 cm=1/100 metres

  3. Time (Second): Second is the SI unit of time. 60 sec=1 min, 60 min=1 hour, 24 hours=1 day

  4. Temprature (Kelvin): Kelvin is hte SI unit of temprature. The tripple point of water is temperature at which all three phases ie. ice, liquid and water vapour can co-exist is273.16 kelvin. The Kelvin is 1/273.16 of the Triple point of water.

  5. Luminous Intensity (Candela): Candela is the SI unit of Luminous Intensity. Luminous intensity means brightness of light

  6. Electric Current (Ampere): Ampere is the SI Unit of electric current.

  7. Amount of Substance (Mole): Mole is the SI unit of the amount of substance. A mole contains same amount of prticles as 12 gm of carbon-12 contains

 

Derived physical quantities

A Physical Quantity expressend in terms of 2 or more fundamental units are called Derived Physical Quantities. It is obtained by dividing or multiplying one basic physical quantity with another basic physical quantity.

eg: Speed, Area, Energy, Force, Frequency, Heat, Velocity, Wavelength etc.
Unit of speed=Unit of distance/Unit of time (m/s or ms-1).


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1. Nyaib Bukele has been Sworn in as the president of  EI Salvador ( EI Salvador's capital: San Salvador, currency: United States Dollar). 2. National Security Advisor (NSA) Ajit Doval reappointed to his post and given Cabinet rank in the second term of the NDA government. 3. World Bicycle Day is observed on 3rd June .

Current Affairs Quiz

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Daily Gk Quiz 17/05/2019
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1. Name the Indian Navy Chief? 2. Recently who has been appointed as first female match referee by ICC? 3. Recently who has becomes the world’s first woman to cross the Atlantic Ocean solo in a light sports aircraft (LSA)?

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