RRB ALP & Technician Basic science and engineering | Completed all ‘Units’ part theory #1#

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RRB ALP & Technician Basic science and engineering | A unit of measurement is a standardised quantity of a physical property, used as a factor to express occurring quantities of that property.

Part A

Section –Basic science and engineering
No. Of Question- 40
Marks- 40

There are seven basic units of science, i.e. KG,M,S,A,K,Mol,Cd 

kilogram (kg)– Unit of measurement of mass

metre (m)– Unit of measurement of length

second (s)- Unit of measurement of time

ampere (A)– Unit of measurement of electric current

kelvin (K)- Unit of measurement of thermodynamic temperature

mole (mol)- Unit of measurement of amount of substance

candela (cd)-Unit of measurement of luminous intensity


Length

1 m = 100 cm

1 km = 1,000 m

1 in (inch) = 2.54 cm

1 m = 39.37 in

1 mile = 5,280 ft = 1.609 km

1 angstrom = 10–10m


Mass

1 kg = 1,000 g

1 slug = 14.59 kg

1 u (atomic mass unit) = 1.6605 x 10–27kg


Force

1 lb (pound) = 4.448 N

1 N = 105dynes

1 N = 0.2248 lb


Energy

1 J = 107ergs

1 J = 0.7376 ft-lb

1 BTU (British thermal unit) = 1,055 J

1 kWh (kilowatt hour) = 3.600 x 106J

1 eV (electron volt) = 1.602 x 10–19J


Power

1 hp (horsepower) = 550 ft-lb/s

1 W (watt) = 0.7376 ft-lb/s

Length = Meter (m) 

Mass = Kilogram (kg) 

Time = Second (s) 

Electric current = Ampere (A)

Temperature =  Kelvin (K) 

Amount of a Substance = Mole (mol)

Luminous Intensity = candela (cd)


Some measurements and their value

1 m = 100 cm = 1,000 mm (millimeters)

1 km (kilometer) = 1,000 m

1 kg (kilogram) = 1,000 g (grams)

1 N (newton) = 105dynes

1 J (joule) = 107ergs

1 P (pascal) = 10 Ba

1 A (amp) = 0.1 Bi

1 T (tesla) = 104G (gauss)

1 C (coulomb) = 2.9979 x 109Fr


 Prefixes  – from 10-15 to 1015 

Femto– 10-15   

Pico– 10 -12

Nano– 10-9

Micro– 10-6

Milli– 10-3

Centi– 10-2

Deci– 10-1

Deka– 101

Hecto– 102

Kilo– 103

Mega– 106

Giga– 109

Tera– 1012

Peta – 1015


Named units derived from SI base units

hertz Hz  frequency 1/s s−1
radian rad  angle m/m 1
steradian sr solid angle m2/m2 1
newton N force, weight kg⋅m/s2 kg⋅m⋅s−2
pascal Pa pressure, stress N/m2 kg⋅m−1⋅s−2
joule J energy, work, heat N⋅m 
C⋅V 
W⋅s
kg⋅m2⋅s−2
watt W power, radiant flux J/s 
V⋅A
kg⋅m2⋅s−3
coulomb C electric charge or quantity of electricity s⋅A 
F⋅V
s⋅A
volt V voltage, electrical potential difference, electromotive force W/A 
J/C
kg⋅m2⋅s−3⋅A−1
farad F electrical capacitance C/V 
s/Ω
kg−1⋅m−2⋅s4⋅A2
ohm Ω electrical resistance, impedance, reactance 1/S 
V/A
kg⋅m2⋅s−3⋅A−2
siemens S electrical conductance 1/Ω 
A/V
kg−1⋅m−2⋅s3⋅A2
weber Wb magnetic flux J/A 
T⋅m2
kg⋅m2⋅s−2⋅A−1
tesla T magnetic field strength, magnetic flux density V⋅s/m2 
Wb/m2 
N/(A⋅m)
kg⋅s−2⋅A−1
henry H electrical inductance V⋅s/A 
Ω⋅s 
Wb/A
kg⋅m2⋅s−2⋅A−2
degree Celsius °C temperature relative to 273.15 K K K
lumen lm luminous flux cd⋅sr cd
lux lx illuminance lm/m2 m−2⋅cd
becquerel Bq radioactivity (decays per unit time) 1/s s−1
gray Gy absorbed dose (of ionizing radiation) J/kg m2⋅s−2
sievert Sv equivalent dose (of ionizing radiation) J/kg m2⋅s−2
katal kat catalytic activity mol/s s−1⋅mol

Source –  https://en.wikipedia.org/wiki/Quantity_of_electricity



 

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