General science for competitive exam
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June 27, 2016 |
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Facts to remember :-
Speed of light is maximum in vacuum
Longitudinal wave can not be polarised .
Rainbow are always formed in direction opposite to the sun
The freuency of visible light varies between 400nm to 700nm .
colour blindness was first discovered by homer (1976)
Focal distance of tens is maximum for red light and minimum for violet fight
3-D image is known as hologram
If a transparent materials invisible in any liquid then both of them have same refractive index
human eyes have convex lens
Raman effects belongs to scattering of light
Optical fibres works on principle of total internal reflection
Proton is ionised hydrogen atom
Cryogenic engine is used in space shuttle
Titanium is known as metal of future
Uranium oxide is known as yellow cake
ceremic is used in super conductivity.
A transformer which increase the applied e.m.f of alternating current is called step up transformer.
hypo or radium thiosulphate is used for fusing in photography
power is sun glasses is zero
heat energy are transmitted as infra red rays .
Air bubble in water behave as concave lens
As temperature increase its refractive index increase
Bolometre is used for detection of infra red rays
Two thinner blankets are warmer than a single blanket equal to their width
colour cloths are good absorbers of heat
Ammonia is used as a coolant in refrigerator
Echo form due to reflection of sound
when two sound sources of nearly same frequency are placed together then beat occur
There is a coating of iron oxide on tape used in tapere corder
At room temperature velocity of sound is 340 m/s
There is no change in frequency of sound when it change medium but its velocity direction and intensity will change
the direction of wave is independents of velocity wavelength and frequency
The velocity of sound is increased with incensing density of medium
Sensation of sound is for 1/10 second
Receiver of telephone converts electrical energy into sound energy.
Wave is formed by b repeated vibrations of particles of medium in which the wave is formed
Pulse is a wave set up by single disturbance of short duration
Neutron was discovered by Chadwick
Carbon dating is used in determining age of fossils
In nuclear fission s greater nuclei is broken into smaller nuclei and there is huge amount of energy Atom bomb works on nuclear fission
when two or more smaller nuclei are joined together to form a large nuclei the process is called nuclear fusion.
A greater amount of energy is released .
Hydrogen bomb works on principle of nuclear fusion.
Cadmium is a good absorb er of neutron used as a controller chain reaction
Polonium is first human made element
slip sings of generator are made up of gun metal
Ammeter is used in DC as well as AC
Resistance in ammeter is very low
Resistance in voltmeter is very high
Generator is based on principle of electromagnetic induction.
Voltmeter measures potential difference between two points.
A parallel combination of galvanometer and a small resistance is equivalent to a voltmeter .
Ammeter is connected in series while voltmeter is always connected in parallel.
Electrovolt is unit of energy.
The resistance of low power bulb is high.
Filament of electric bulb is tungsten.
Wire of electric heater is made up of nichrome.
Fuse wire is made up of lead and tin .
Chemical energy is stored in battery
Soft iron is used in electric magnate
The height of mercury column in barometer is independent of the diameter of glass tube
The frequency of second pendulum is 2 s
Clouds are flying due to their last density and viscosity of air .
Viscosity of gases increase with increase of in temperature.
The force of attraction between atom of same material is called cohesive force.
The force of attraction between atom of different material is called adhesive force.
Speed of light is maximum in vacuum
Longitudinal wave can not be polarised .
Rainbow are always formed in direction opposite to the sun
The freuency of visible light varies between 400nm to 700nm .
colour blindness was first discovered by homer (1976)
Focal distance of tens is maximum for red light and minimum for violet fight
3-D image is known as hologram
If a transparent materials invisible in any liquid then both of them have same refractive index
human eyes have convex lens
Raman effects belongs to scattering of light
Optical fibres works on principle of total internal reflection
Proton is ionised hydrogen atom
Cryogenic engine is used in space shuttle
Titanium is known as metal of future
Uranium oxide is known as yellow cake
ceremic is used in super conductivity.
A transformer which increase the applied e.m.f of alternating current is called step up transformer.
hypo or radium thiosulphate is used for fusing in photography
power is sun glasses is zero
heat energy are transmitted as infra red rays .
Air bubble in water behave as concave lens
As temperature increase its refractive index increase
Bolometre is used for detection of infra red rays
Two thinner blankets are warmer than a single blanket equal to their width
colour cloths are good absorbers of heat
Ammonia is used as a coolant in refrigerator
Echo form due to reflection of sound
when two sound sources of nearly same frequency are placed together then beat occur
There is a coating of iron oxide on tape used in tapere corder
At room temperature velocity of sound is 340 m/s
There is no change in frequency of sound when it change medium but its velocity direction and intensity will change
the direction of wave is independents of velocity wavelength and frequency
The velocity of sound is increased with incensing density of medium
Sensation of sound is for 1/10 second
Receiver of telephone converts electrical energy into sound energy.
Wave is formed by b repeated vibrations of particles of medium in which the wave is formed
Pulse is a wave set up by single disturbance of short duration
Neutron was discovered by Chadwick
Carbon dating is used in determining age of fossils
In nuclear fission s greater nuclei is broken into smaller nuclei and there is huge amount of energy Atom bomb works on nuclear fission
when two or more smaller nuclei are joined together to form a large nuclei the process is called nuclear fusion.
A greater amount of energy is released .
Hydrogen bomb works on principle of nuclear fusion.
Cadmium is a good absorb er of neutron used as a controller chain reaction
Polonium is first human made element
slip sings of generator are made up of gun metal
Ammeter is used in DC as well as AC
Resistance in ammeter is very low
Resistance in voltmeter is very high
Generator is based on principle of electromagnetic induction.
Voltmeter measures potential difference between two points.
A parallel combination of galvanometer and a small resistance is equivalent to a voltmeter .
Ammeter is connected in series while voltmeter is always connected in parallel.
Electrovolt is unit of energy.
The resistance of low power bulb is high.
Filament of electric bulb is tungsten.
Wire of electric heater is made up of nichrome.
Fuse wire is made up of lead and tin .
Chemical energy is stored in battery
Soft iron is used in electric magnate
The height of mercury column in barometer is independent of the diameter of glass tube
The frequency of second pendulum is 2 s
Clouds are flying due to their last density and viscosity of air .
Viscosity of gases increase with increase of in temperature.
The force of attraction between atom of same material is called cohesive force.
The force of attraction between atom of different material is called adhesive force.
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