1.ASTRONOMICAL UNIT (AU) ---
THE ASTRONOMICAL UNIT IS A UNIT OF LENGTH , ROUGHLY THE DISTANCE OF EARTH TO THE SUN And EQUAL TO ABOUT 150 MILLION KILOMETRES.
1AU = 1.496 mult 10^11m
2. Light Year --- AKT
It is distance travelled by the light in vacuum in one year .
1ly = 9.46 multi 10^15 m
3. Parsec (ps) ---
The parsec is unit of length use to measure the large distance to astronomical objects outside the Solar System.
1ps = 3.1multi 10^16m = 3.26ly
1 OUNCE = 28.35 G
1 POUND = 16 OUNCE = 453.52 G
1 METRIC TON = 1000 KG
1 QUINTAL = 100 KG
1 YARD = 36 INCH
1 FOOT = 12 INCH AKT
1 INCH = 2.54 CM
1 MILE = 1760 YARDS
1 ACRE = 4840 SQUARE GUJ = 43560 SQUARE FOOT
1 HECTARE = 2.5 ACRE
1 KM^2 = 100 ACRE
PREFIXES FOR POWERS OF TEN
FACTOR NAME SYMBOL
10^24 YOTTA Y
10^21 ZETTA Z
10^18 exa e
10^ 15 peta P
10^ 12 TERRA T
10^ 9 giga G
10^6 mega M
10 ^ 3 KILO K
10 ^ 2 HECTO H
10 ^ 1 DECA DA
10 ^ -1 DECI d
10 ^ -2 centi c
10 ^ -3 AKT milli m
10 ^ -6 micro u
10 ^ -9 nano n
10^ -12 pico p
10 ^-15 femto f
10 ^ -18 atto a
10 ^ -21 zepto z
10^-24 yocto y
Measuring Instrument :-
Altimeter : - measures altitude
Ammeter :- measures strength of electric current
Barometer :- atmospheric pressure
Anemometer :- velocity of wind and directions
Fathometer : - depth of ocean
Galvanometer :- measures electric current
Hydrometer :- relative density of liquids
Hygrometer :- level of humidity
Manometer :- pressure of gases
Microscop :- To obtain a magnified view of small objects
Sphygmometer :- measures blood pressure
Stethoscop :- used by doctors to hear and analyze heart and lung sounds
Tachometer :- rotational speed of a shaft
Question 1. The unit of luminous intensity is
ans- candela
Question 2. How many millimeters are there in a kilometer ?
ans-
Quetion3. 1 famto is equal to
ans - 10^-15m
Question4. The device used to measure potential difference is known to
ans- voltemeter
Question 5. What does Angstrom measure ?
ans :-
Question 6. Anemometer is used in measuring
ans :- wind velocity
Question 7. The Tachometer is the device with which to measur -
Ans:- speed
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