Unit-1😎😎

Question 1

why do scientists use scientific notation??🤔😁

Answer 1

scientists use scientific notations to note down large or small objects in our universe or the universe itself.it is written in the powers of 10 and helps find big or small values

Question 2

what is the largest and smallest object measured up till now??🤔😁

Answer 2

the largest object measured up till now is the universe which is 10^26

the smallest object measured up till now is the plank scale which is 10^-35

Question 3

what are the 3 international systems of units??🤔😁

Answer 3

M.K.S = meter, Kg, second
C.G.S = CM, Gm, seconds
F.P.S = foot, pound, second

Question 4

mention all the prefixes with the power.🤔😁

Answer 4

10^-15——————————>femimter
10^-12——————————>picometer
10^-9——————————–>nanometer
10^-6———————————>macrometer
10^-3——————————–>millimeter
10^-2——————————>centimeter
10^-1——————————>decimeter
10^3——————————->kilometer
10^6——————————–>megameter
10^9——————————–>gigameter
10^12—————————–>terameter

Question 5

what is the formula for converting Km/Hr=M/S and vice-versa??🤔😁

Answer 5

Km/hr = 5/18 m/s
m/s = 18/5 km/hr

Question 6

define zero error.🤔😁

Answer 6

It is a systematic error in the instrument when it doesn’t start with 0

Question 7

define vernier caliper.🤔😁

Answer 7

it is a measuring device that calculates up to 0.01cm or 0.1mm

Question 8

what is the formula for finding the reading of the vernier caliper??🤔😁

Answer 8

Reading= Main scale + vernier scale + least count

Question 9

define element.🤔😁

Answer 9

when atoms of the same type come together, they form an element. for example, all gold atoms together form gold metal

Question 10

define compound.🤔😁

Answer 10

when different types of atoms combine, they form a compound. water for instance is a compound made up of hydrogen and oxygen atoms

Question 11

define molecules.🤔😁

Answer 11

group of atoms bonded together are called molecules. The molecules can be simple like oxygen or complex like DNA

Question 12

what is our majority body made up of??🤔😁

Answer 12

the great majority of our body is made up of molecules that contain carbon

Question 13

state the properties of diamonds.🤔😁

Answer 13

Diamond–:
1)extremely hard
2)transparent
3)it is a bad conductor of electricity
4)carbon atoms arranged in a flat sheet with weak bonds between sheets

Question 14

state the properties of graphite.🤔😁

Answer 14

graphite–:
1)soft
2)slippery
3)it is a good conductor of electricity due to free electrons within the layers
4)carbon atoms arranged in a flat sheet with weak bonds between sheets

Question 15

state the properties of graphene.🤔😁

Answer 15

graphene–:
1)extremely strong
2)flexible
3)Graphene is an excellent conductor of electricity.
4)A single layer of carbon atoms in a honeycomb-shape