Important Units Of Measurements | Physics General Knowledge questions and answers
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List Important Units Of Measurements in Physics
- 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.
- 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.
- 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.
- 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.
- 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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