UNITS OF MEASUREMENT

IMPORTANT UNITS OF MEASUREMENT OF WORLD

1 horse power is 745.7 watts

1 horse power = work equal to lifting 550 lbs of weight to one foot for one second

1 calorie is equal to 4.2 Joules

1 barrel is equal to 159 liters

6 feet = 1 fathom

1 kwh = 3.6 x 10 power 6 joules

A 100 watt bulb lights for 1 hour uses 100 watt hour of electricity

-273 degree centigrade is called absolute zero temperature.

Standard pressure is 760 mm or 14.7 lb/in2

Gross is equal to 12 dozens

Mach 2 = 500 miles per hour

1 nautical mile = 1825 meters

Unit of pressure is Pascal

Force is measured in Newton (SI), Dyne (CGS)

At -40 deg F Fahrenheit scale is equal to centigrade scale

Hertz and Angstrom are units of frequency

Units of work and energy are Joule and Erg (CGS)

Diopter is unit of power of lens

Unit is density is kg/m3

Unit of power is watt, BTU (Board of Trade Unit)

Unit of electric charge is Coulomb

Unit of voltage is volt

Unit of electric resistance is ohm

Unit of capacitance is Farad

Unit of magnetic flux is Weber, Tesla

Unit of radio activity is Becquerel

Unit of luminous intensity is candle, lux

Unit of crude oil is Barrel

Unit of volume of water is cusec, cubic/sec

Unit of admittance is Mho

Unit of intensity or loudness of sound is bel

Unit of viscosity is Poise

Unit of flight speed is Mach I

Unit of atmospheric pressure is milli bar

Unit of wave length of light is Angstrom

Unit of energy is Electron volt

Unit of brightness is Lambert

Unit of luminous flux is Lumen

Intensity of illumination or unit of luminosity is Lux, Candela and Candle power

Unit of magnetic pole strength is Weber

Unit of RAD (Radiation Absorbed Dose) is Gray

Unit of Electric Current is Ampere

Unit of inductance is Henry

Unit of conductance is siemens.

Unit of heat is Joule, Calorie, BTU (British Thermal Unit)

Radio activity is measured in currie

Rutherford : strength of radioactivity

Torr: pressure

Fermi : length [A unit of length equal to one femtometer (10-15 meter)]

Sved berg unit:sedimentation rate

Dioptre: power of lense

Mho : conductivity

Henry: inductance

Maxwell: magnetic flux

Becquerel: radioactivity

Kilo watt hour: power

Coulomb: unit of electrical charge

Weber: unit of magnetic flux

Tesla: unit of magnetic flux density

Siemen: unit of conductance

Rutherford: unit of rate of decay of radioactive material

Faraday: unit of electric charge

Angstrom: unit of length, used especially to specify radiation wavelengths

Parsec: unit of astronomical length

Degree: unit of measurement of an angle

Steradian: Unit of solid angle measurement

Dyne is a unit of Force.

SI unit of pressure is Pascal.

Curie is a unit of : radioactivity

Pascal Sound Pressure

Torr Pressure

Curie Intensity of radioactivity

Angstrom Unit of length

Light year The distance light travels in a year

Dioptre Lens refractive power

Horse power Unit of Power

Radian Unit of angular measure

Candela Unit of luminous intensity

Mole unit of amount of substance

What is measured in units called phon- Sound 192

What is measured in grains - four grains to a carat- Pearls

Unit of electromotive force in Volt.

What is the SI unit of illumination -Lux

Gross is equal to 12 dozen.

Ozone is measured in percent age.

An object traveling at Mach 2 is traveling approximately at 500 mph.(chk)

What is measured on the Gay-Lussac scale: Alcohol strength

Chronometer is used to measure... time

Anemometer is used to measure... Wind Speed

The clusec is the unit measuring the power of what Vacuum pumps

One million cycles per second is called Megahertz.

0.200 grams are equal to one carat.

Voltammeter is an electrolytic cell for conducting electrolytic dissociation of electrolyte.

8 furlongs make one mile.

A billion contain 1000 million. It has 9 zeroes. Similarly a trillion has 12 zeroes,a quadrillion 15 zeroes,a quintillion 18 zeroes and a decillion 33 zeroes.

One inch is equal to 2.5400 cms and one mile is equal to 1.6093 kms.

One micron is equal to One-thousandth of a millimeter.

2.47105 acres is equal to what SI unit-Hectare

What word describes one tenth of a nautical mile-Cable

What is measured on the Torro scale -Tornados

unit of sound named after- Alexander Graham Bell - Decibel

The density Smoke is measured on the Rngelmann scale-

Unit of electromotive force in Volt.

Power is measured in Watts (w).

Resistance was discovered by Girge Ohm in 1826, and is measured in ohms.

Electricity does not flow through a circuit by itself. It needs a ‘push’, or energy, to keep it moving. We call this energy the voltage of the circuit. Voltage is measured in volts (v).

The German scientist George Ohm (1787-1854) is best remembered for working out ohm’s law. He discovered that they voltage across a conductor such as a trip of metal or a wire – and the current following through it always vary in the same proportion. So if you double the voltage, you double the current. This is incredibly useful; because it lets you predict the current you will get for a particular voltage.

The thickness of silk is measured in what- Denier

Ohm’s law does not apply to semiconductors and conductors when there is change in temperature.

In our houses we get 220 V a.c. The value of 220 V represents the effective voltage.

One unit of electric power is consumed when 10 A of current flows for 1 hour at 100 V. 1 Unit = 1 kw hr = 1000 w hr = 100 x 10 x 1 hr

If the same note is played on a flute and a sitar, one can still distirguish b/w them because they differ in quality.

A negatively charged glass rod has always less protons than electrons.

The wavelength of the X-rays is of the order of 0.1 nanometer.

Red, green and blue are known as primary colours. These are colours which cannot be produced by mixing with other colours.

Scattering of light ___ the duration of the day (make)

Oil rises in a wick of oil lamp on account of a property of matter called Capillary Action

a primary cell can ___ be charged again (not)

When a person can see nearer objects but not the distant ones he is said to be suffering from : nearsightedness (myopia)

ATP is a molecule containing high energy bonds.

An example of inorganic compound is carbon monoxide.

The time period of a pendulum on moon increases.

Clinical thermometer usually measures in Fahrenheit.

Tube light emits radiation even after it is disconnected. It is due to Fluorescence.

Shortsightedness can be corrected with the use of Concave.

Rectifier converts AC into DC

Atomic weight of chemical compounds is determined by Mass spectroscopy.

Atomic pile is a place where nuclear fission is made.

Drinker’s apparatus is for measuring the amount of Alcohol in the blood.

Dewar’s flask is called as thermos.

The conversion of gases into liquid under high pressure and low temperature is called regulation.

If a green leaf is seen in a red light its color will be black.

Emerge of VIBGYOR from one side of the prism is due to refraction and dispersion of light.

Oxidation is the process in which electron is lost.

Half-time is a time of radioactive substance taken by that substance to decompose radioactivity to half of its weight.

Light energy is stored in the form of chemical energy due to the activity of Chloroplast.

Sunlight is composed of seven colours

Oil rises in a wick of oil lamp on account of a property of matter called Capillary Action

What is a Fata Morgana- Type of Mirage

Freon-trademark for any of a number of chemical compounds containing fluorine, and often chlorine or bromine. Use: as solvents, as aerosol propellants, in refrigeration. It is commonly used in refrigerator.

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UNITS OF MEASUREMENT

IMPORTANT UNITS OF MEASUREMENT OF WORLD

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