Get real time updates directly on you device, subscribe now.

# 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

हे पण वाचा -
1 of 2

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 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

Get real time updates directly on you device, subscribe now.