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Important Unit of Measurements

• 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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