PHYSICS

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PHYSICS

What is mass? Mass is the amount or quantity of matter contained in a body.
Which instrument converts electrical energy into heat energy? Electric heater.
What is the primary source of energy in the earth? Sun is the primary source of energy.
How is energy produced in the Sun? By Nuclear fusion.
What is Kinetic energy? The energy produced by a body by virtue of its motion.
Who propounded the Ohm's law? George Simon Ohm.
What is the unit of electrical resistance? Ohm.
What is Quantum Theory? Energy like matter exist in lumps or quanta. It is based on the idea that energy can be changed only in a certain discrete amount for a given system.
Whose theory is called the Quantum Theory? It is Max Planck's theory. For this he was awarded 1918 Nobel prize.
What is the unit used to measure electromotive force? Volt.
The charge produced when a current of one ampere flows for one second: litre.
The unit used to measure the flow of electric current: Ampere.
Who discovered that the flow of electric current influences a magnetic needle? metre - in 1820.
Who first developed the battery producing electric charge? Alessandro Volta.
Who first made an electro magnet? William Sturger.
Which instrument converts electrical energy to mechanical energy? Electric motor.
The instrument which converts electrical energy into light energy: Electric lamp.
Who invented electric bulb? Thomas Alva Edison in 1878.
The instrument which converts mechanical energy into electrical energy: Dynamo.
The name of the moving armature in a dynamo: Rotar.
The instrument which converts light energy into electric energy: Photo electric cell.
The commercial unit of electric charge: k. w. h.
The instrument which converts sound in to electricity: Microphone.
What is the electric charge of an electron? 1.6 * 10(power)-19 Coloumb.
Who developed the law of attraction or repulsion of electric charges? Coloumb.
Who discovered that molecules can be broken down by passing electricity through the solution of substance? Michael Faraday.
The instrument used to detect the presence of electric charge: Electroscope.
Which branch of medicine has proved that electricity helps the growth of bones? Electrotherapy.
What are the colours in sunlight? VIBGYOR.
The series of one element with the same atomic number but with differing atomic weights: Isotopes.
Who artificially made radio Isotopes? Irene curie, Fredrick Jolio.
An isotope of Hydrogen: Deuterium
The early exponent of atomic theory Democretes.
Who first predicted the existence of Isotopes? Fredrick Sodi.
The smallest particle of a substance: Atom.
What are present in the nucleus of an atom? Proton and Neutron.
The place in India where the first nuclear test was conducted: Pokharan hills, Rajasthan.
What are the electrons which are emanated on heating? Thermoelectrons.
What is the charge of the nucleus of an atom? Positive
What is the other name for thermoelectrons? Thermions.
Which is the mobile part in an atom? Electron.
An element without neutron: Hydrogen
The scientist who discovered the existence of the nucleus inside the atom: Ruther Ford in 1911.
The force which hold the protons and neutrons together inside the nucleus: Electrostatic force.
What is meant by "nucleonics"? The science which deals with the practical uses of atomic energy.
The chargeless particle in the atom. Neutron.
The enunciator of modern atomic theory. John Dalton.
The first nuclear submarine. Nautillus (U.S.A)
What is the mass of an electron? 9.1 * 10 (power) -31 kg.
The mass of a proton. 1.672 * 10 (power) -27kg.
The mass of a neutron. 1.674 * 10 (power) -27kg.
Who made the first nuclear reactor? Enrico Fermi.
Who is the father of the concept of atom? Dalton.
What is the electron volt liberated by the disintegration of a uranium atom? 20 crores.
Which is most chemically active element? Flourine.
Which are the methods by which atom bomb works? Neuclear fission, neuclear fusion.
What do you call a solution which conducts electricity? Electrolyte.
Who first developed the dynamo? Michael Faraday.
Who first used the word "electric"? Gilbert.
The substance used for making the coil in an electric iron. Nicrome.
Which glass is used for building the body of cars? Fibre glass.
What is fibre glass? Glass made of thread fibres.
Which is opaque glass? Ceramic glass.
Glass used in making the window of motor vehicles Chemcor.
Which glass is used for making the nose core of space vehicles? Pyrosero.
What is electro plain glass? Glass with metallic plates which can remove electric charge.
The glass which darkens in sunlight and shines at darknes. Photocromic glass.
The surface tension of water at 0 degree C: 78.5 dynes/cm square.
The density of water. 1 gm/cm cube.
The pole where Hydrogen is formed during the electrolysis of water. Cathode.
In which pole does oxygen appear during electrolysis of water? Anode.
The volume of steam produced on the vapourisation of l. c. c of water: 1000 cm cube.
At what point of the Kelvin scale does water boil? 373 degree K (under ordinary pressure).
The specific heat of water: 1 cal/gm.
The latent heat of steam: 540 cal/gm.
A gas used in ice plant: Ammonia.
Which gas is filled in the electric bulb? Argon.
Who enunciated the Boyle's law? When? Robert Boyle, In 1662.
The density of water at 100 degree C: 0.9584 gm/ cc.
What change takes place when water freezes? Volume increases and density decreases.
Who identified heavy water? Harold Yuri.
At what temperature does heavy water have highest density? 11.6 degree C.
The instrument used to convert A. C current to D.C. current: Rectifier.
The part in the refrigerator which controls the temperature level: Thermostat.
The battery used in vehicles: Storage battery.
The scientist who proved the existence of seven colours in sunlight: Sir. Isaac Newton.
The unit of measure supersonic speed: Mac.
The speed greater than the speed of sound in air: Supersonic speed.
Who proved that light travels faster than sound? Olas Romer.
Element without neutron: Hydrogen.
What are primary colors? Red, Green, Blue.
What is the standard pressure of atmospheric air? 76 cm of mercury.
An alloy with the least metallic expansion: Invar steel.
An alloy used to pierce rocks: Manganese Steel.
What is meant by metal fatigue? The detect of a metal of breaking when beaten from side to side.
Metals used in transistors: Germenium, Silicon, Selenium.
What is thermoplastic? A substance which softens on heating and hardens on cooling.
A kind of plastic which behaves like sponge: Urithanresin.
Plastic with metallic quantities: Noryl
Kind of plastic used in making heart values: Teflan
Plastic used to make artificial kidney: Polivinte pyroaisin.
The raw materials for the production of Terelyne: Charcoal, Petrol.
The raw materials from which artificial dye is made: Coal tar.
Who first made artificial dye from coal tar? W. H. Perkin.
What is super conductor? A conductor without any resistance at all.
What is the unit of heat? Calorie.
What is to be done to make water boil at temperature below 100 degree C? By reducing the pressure.
Which region weighs the whole weight of Atom? At the nucleus.
What is a dynamo? An instrument which produces electricity.
What type of electricity is there in the house supply line: Alternating current.
What is the fixed part of a dynamo (magnet) called? Stater.
The instrument employed to change the voltage in an electric current: Transformer.
The instrument used to change the direction of the flow of current: Commutator.
The voltage in house supply line: 230 volts (AC)
What is the expansion of kwh? Kilo-watt-hour.
What is the unit of electrical charge under MKS System: Coloumb.
What is electrolysis? It is the breaking down of a substance when electric current is passed through its solution.
The principal element used in the production of solar cell: Silicon.
What is electrodynamics? It is the study on electricity concerned with interactions between electrical and mechanical forces.
The instrument used to demonstrate Archimedes principle: Cartasian Devise.
Who discovered radium? Radium was discovered by Pierre Curie and Marie Curie in 1897.
When was nuclear fission discovered? It was discovered in 1938 by Lise Meitner (Austria) and Otto Hahn (Germany).
The instrument used to demonstrate that Archimedes principle is applicable to gases: Baroscope.
A barometer without liquid: Aneroid Barometer.
The scientist who tried to prove that air is weightless: Voltaire.
In which year was electron discovered? In 1897 by Sir Joseph Thomson.
What is absolute zero? It is the temperature at which the atoms of a substance become stationary (ie-273 degree C or 0 degree K).
Which scientist has carried the term "Absolute Zero": Lord Kelvin.
How much is the atmospheric temperature above the "Absolute zero"? 300 degree C.
What is zero energy? The energy that remains in the atoms at absolute zero.
Who was the Indian scientist awarded Nobel prize for physics? Dr. C. V. Raman, in 1930.
At which temperature do the readings of the centigrade and the Fahrenheit scales coincide? 40 degree C and 32 degree F.
Lightning is observed earlier than the sound is heard: Because light travels faster than sound.
Who discovered photo electricity? Hertz.
X-rays were discovered by: W. K. Rontgen in 1895.
Who propounded the theory of Electrolysis: Faraday.
Water in a reservoir exerts pressure: in all directions.
What is always contained in amalgams? Mercury.
Jet engines are: reaction engines.
Stainless steel usually contains about 15 % of: Chromium.
What is the element which is common both of nichrome and german silver: Nickel.
Hydrogen bomb is based on the phenomenon of: nuclear fusion.
Turpentine oil is taken from: Pine trees.
In a diesel engine the high temperature needed to ignite the fuel is achieved by: Compressing air in the cylinder.
The device used for converting alternating current to direct current is called: Converter.
Woollen clothes keep us warm in winter because they: Prevent the heat of the body from escaping.
The boiling point of water is not affected by: The temperature of the heat source.
An earth satellite is kept moving in its orbit by the centripetal force provided by: The gravitational attraction of the earth on the satellite.
The velocity of light was first measured by: Roemer.
In a Vaccum flask silvering reduces the loss of heat by: Radiation.
In a dry cell the positive electrode is: Carbon rod.
When water freezes, its volume: Increases.
The temperature of the sun is measured by: Pyrometer
One H. P. is equivalent to: 746 watts.
Explosion of atom bomb is due to: Nuclear Fission.
Instrument for taking photograph in dark and fog is: Infra red camera.
Color of light is determined by its: frequency.
Non metal that conducts electricity is: Graphite.
The alloys of german silver are: Copper, Zinc and Nickel.
When water is cooled from 4 degree C to 0 degree C it: Expands.
No sound is heard on the moon because there is no: atmosphere in the moon.
Choke coil is used as: Resistance wire in A.C. Circuit.
166. Who determined the quantity of electric charge in an electron? R. A. Millican.
The working of rocket is based on the principle of: Conservation of momentum.
The working of jet plane is based on: Newton's third law of motion.
Which are Newton's three Law of motion?

1) A body continues in a state of rest or of motion at constant speed in a straight line, except when this state is changed by forces acting on it.

2) Force is equal to mass multiplied by acceleration.

3) To every action there is equal and opposite reaction.

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