# NCERT Class 11 Physics Solutions: Chapter 2-Unit and Measurement Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**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