PHYSICS CH8 Sound — Science STD 9 — Question

Write about the elements of Xylem.

Derive an expression for Pressure due to the Liquid column.

Differentiate between flat worms and round worms?

to match:

Group in the modern periodic table	Families
a) 1	?
b) ?	Transition metals
c) ?	Boron family
d) 15	?
e) 17	?

Identify the incorrect statement and correct them.

1. Like covalent compounds, coordinate compounds also contain charged particles (ions). So they are good conductors of electricity. 
2. Ionic bond is a weak bond when compared to Hydrogen bond.
3. Ionic or electrovalent bonds are formed by mutual sharing of electrons between atoms. 
4. Loss of electrons is called Oxidation and gain of electron is called Reduction.
5. The electrons which are not involved in bonding are called valence electrons.

The following graph shows the motion of a car. What do you infer from the graph along with OA and AB? What is the speed of the car along with AB and what time it reached this speed?a) What do you infer from the graph along OÄ and AB What is the speed of the car along AB?What time it reached this speed

Define acceleration and state its SI unit for motion along a straight line, when do we consider the acceleration to be (i) positive (ii) negative? Give an example of a body in uniform acceleration.

Write SI units for the fundamental quantity.

Write a note on orbital velocity