Structure of the Atom — Science STD 9 — Question

Give the characteristic features of their cells.

Define:
Pitch

Name the type of muscles that accomplish peristalsis.

When water is cooled to a temperature x, it gets converted into ice at temperature x by a process called P. And when ice at temperature x is warmed, it gets reconverted into water at the same temperature x in a process called Q.

1. What is the value of temperature x in Kelvin?
2. What is the process P known as?
3. What is the name of energy released during process P?
4. What is the process Q known as?
5. What is the name of energy absorbed during process Q?

There are three solids balls made up of aluminium, steel and wood, of the same shape and same volume. Which of them would have highest inertia?

How do storage grain losses occur?

Give one example each of unicellular and multicellular organism.

Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Plot the v-t graph for the following data and state the nature of motion the body:

v(m/s):	0	5	8	12	18	25	30	35	40	45
t(s):	2	4	6	8	10	12	14	16	18	20