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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
(a)
1 cm

Volume of the cube

But, 1
1

Hence, the volume of a cube of side 1 cm is equal to
(b)
The total surface area of a cylinder of radius r and height h is
Given that,
(c)

Using the conversion,
=

Therefore, distance can be obtained using the relation:

Hence, the vehicle covers 5 m in 1 s.
(d)

Relative density of a substance is given by the relation,

Relative density

Density of water = 1 g/

Density of lead

Again, 1 g