Question

1. Name some of the derived quantities.
2. Give the value of one light year.
3. Write down the formula used to find the


volume of a cylinder.
4. Give the formula to find the density of
objects.
5. Name the liquid in which iron ball sinks.
6. Name the units used to measure the distance
between celestial objects.
7. What is the density of gold?​

Answer 1

Explanation:

Ans 1 )

Derived quantities - name - symbol

pressure stress - pascal - Pa

Energy, work, quantity of heat - Joule - J

power, radiant flux- watt - W

electric charge, quantity of electricity -

coulumb - C

Ans b) 1 light year = 9.461 x 10 square 15 metres

Ans c) The formula of density is d = M/V, where D is density, M is mass and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

ans g) for example, the mass density of gold is

19.3 g/ cc, lead is 11.4 g/ cc, copper is 9.0 g / cc,

Aluminium is 2.7 g / cc, water is 1.0 g/ cc,

( 1 g/ cc = 1 gram per cubic centimetre).