CONTENTS OF SCIENCE
(Physics, Chemistry, Biology, Everyday
Science and Computer)
> Silicon can be obtained from Sand.
> Light year is the unit of Distance.
> Significant figures in 0.0010 are two.
> The time is taken by light to travel from moon
to earth is 80 seconds.
> The direction of avector in space is specified by
> Torque is also called moment of a force.
> When brakes are applied to a fast moving car,
the passengers will be thrown forward.
> Range of the projectile is the same for the angle
35° and 55°.
> For maximum horizontal range, the angle of
projection must be 45°.
> If we add all the 7 colours of rainbow (red,
yellow, blue, green, orange, violet and indigo),
the resultant colour would be White.
> When white light passes through a prism, it
splits into 7 colours.
> A camera uses a convex lens to form an image
on a piece of film at the back.
> Short-sight defect could be corrected by a
> Red + Green + Blue = White
> Ozone layer protects the Earth from ultraviolet
radiations from the Sun.
> The distance of Moon from the Earth is 384,000
> There are 8 planets in orbit around the Sun.
> Planets are kept in orbit by the Gravitational
pull of the Sun.
> Nuclear is not a Renewable Energy.
> When vapours of a substance are cooled and
changes into liquid, it is called condensation.
> An instrument used to measure gas pressure is
> If we add salt to the pure water, its boiling point
> The boiling point of alcohol is79 °C.
> The presence of impurities decreases the
freezing point of water.
> The melting point of ice is lowered by increase
> At high altitude the air temperature is lower as
compare to sea level, therefore water boils at
> Evaporation is a cooling process.
> The refrigerator works on the two processes
condensation and evaporation.
> Air is a very good insulator of heat.
> Heat is transferred by three different processes
conduction, convection and radiation.
> In solids heat is transferred through conduction
> Gamma rays radiation has the shortest
wavelength in the electromagnetic spectrum.
> Gamma rays radiation has the highest
frequency in the electromagnetic spectrum.
> Radio rays radiation has the longest wavelength
in the electromagnetic spectrum.
> Radio rays radiation has the lowest frequency in
the electromagnetic spectrum.
> Gamma rays are useful in cancer treatment.
> The speed of sound will be maximum if passing
> The wire used to make the filament of a light
bulb is made of tungsten.
> The wire used to make heating elements in
electric kettles and irons are made of nichrome.
> Work done along the closed path in a
gravitational field is zero.
> When two protons are brought closer, potential
energy of both of them is increases.
> One KWh is equal to 3.6 MJ.
> The consumption of energy by a 1000 watt
heater in half an hour is 0.5 Kwh.
> Biomass includes crops residue, natural
vegetation and animal dungs.
> Hydroelectric is the conventional source of
> Ethanol (Alcohol) is a type of bio fuel.
> The number of Earth stations which transmit
signals to satellites and receive signals from the
> INTELSAT operate ate frequencies 4, 6, 11, 14
having unit of GHz.
> The property of fluids due to which they resist
their own flow is called viscosity.
> Density of fluid is define as its mass of volume
> Stoke’s law holds for motion through viscous
> Fog droplets are suspended in air when their
weight is balanced by upward thrust due to air.