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NCERT Solutions for Class 11 Physics Chapter 2- Units and Measurements

1

The chapter will deal with various physical units that are quantitatively used in physics. We will discuss the international system of units and their usage. We read about the measurements of a length over both short and long distances.

The chapter also teaches us about the measurement of masses and their range. The students also learn about time and its measurements. The chapter also entails the accuracy of these measurements and its various shortfalls. We also read about how significant numbers are measured and calculated. The chapter concludes by teaching about the dimensions of physical quantities and their formulae.

  • Physics is based on the measurement of physical quantities.
  • Certain physical quantities are considered to certain or fundamental physical quantities like length, mass, time etc.
  • The chapter tells us about the CGS, the FPS, and the MKS systems respectively.
  • The chapter also contains derivatives and formulae to measure the distance over long and short distances.
  • We will learn to calculate length even at the molecular level.
  • Next, we move on to the measurement of mass.
  • We learn about the mass of different atomic and sub-atomic particles and the different ways to calculate them.
  • The chapter also includes the measurement of time.
  • We will learn about the different standards of time and the ways to calculate them.
  • The chapter also illustrates the different methods of finding errors in our measurement calculations.
  • These errors include – systematic errors, random errors, least count error, absolute, relative, and percentage errors.
  • Derivatives are also required to determine these errors.
  • The reliable digits in derivatives plus the uncertain first figures are known as significant numbers.
  • We will learn about arithmetic operations with significant numbers and how to round them off.
  • The chapter concludes by telling us about the dimensions of physical quantities and their application.
  • For example, the acceleration of gravity on the moon is one-sixth of earth, but the law of gravity is followed in both.

 

 

 

 

Also See    
NCERT Solutions for Class 11 Physics Chapter 1- Physical World NCERT Solutions for Class 11 Physics Chapter 2- Units and Measurements NCERT Solutions for Class 11 Physics Chapter 3 - Motion as a Straight Line
NCERT Solutions for Class 11 Physics Chapter 4 - Motion in a Plane NCERT Solutions for Class 11 Physics Chapter 5 - Law of Motion NCERT Solutions for Class 11 Physics Chapter 6 - Work, Energy and Power
NCERT Solutions for Class 11 Physics Chapter 7 - Systems of Particles and Rotational Motion NCERT Solutions for Class 11 Physics Chapter 8 - Gravitation NCERT Solutions for Class 11 Physics Chapter 9 - Mechanical Properties of Solids
NCERT Solutions for Class 11 Physics Chapter 10 - Mechanical Properties in Liquids NCERT Solutions for Class 11 Physics Chapter 11 - Thermal Properties of Matter NCERT Solutions for Class 11 Physics Chapter 12 - Thermodynamics
NCERT Solutions for Class 11 Physics Chapter 13 - Kinetic Theory NCERT Solutions for Class 11 Physics Chapter 14 - Oscillations NCERT Solutions for Class 11 Physics Chapter 15 - Waves

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