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NCERT Class 11 Physics Solutions: Chapter 2 - Unit and Measurement Part 1

Question: 2.1

Fill in the blanks

(a) The volume of a cube of side 1 cm is equal to __________

(b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to ________

(c) A vehicle moving with a speed of 18 km covers _______ m in 1 s

(d) The relative density of lead is 11.3. Its density is _________ g . Or ________ kg .

Answer: 2.1


1 cm

  • Volume of the cube

  • But, 1


  • Hence, the volume of a cube of side 1 cm is equal to


  • The total surface area of a cylinder of radius r and height h is

Given that,


  • Using the conversion,


  • Therefore, distance can be obtained using the relation:

  • Hence, the vehicle covers 5 m in 1 s.


  • Relative density of a substance is given by the relation,

  • Relative density

  • Density of water = 1 g/

  • Density of lead

  • Again, 1 g