NCERT Class 11 Physics Solutions: Chapter 2 - Unit and Measurement Part 1
Get top class preparation for CBSE/Class-9 right from your home: get questions, notes, tests, video lectures and more- for all subjects of CBSE/Class-9.
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