Which of the following has the highest refractive index?
Crown glass
Water
Flint glass
Diamond
Correct Answer :
D. Diamond
Related Questions
We see the sun before it actually rises on the horizon. This is due to
refraction
reflection
total internal reflection
parallax
Red Light is used as a dancer signal because
it is pleasing to the eye
it has a traditional colour
it is easily distinguishable
it is most sensitive to the human eye
When the resistance of a circuit increases the current will
increase
decrease
remain the same
None of the above
The speed of sound in air at 0° C is approximately
4 x 108 m/s
1500 m/s
330 m/s
500 m/s
The Indian Satellite System used for domestic communications, television and meteorology is known as
INSAT
Bhaskara
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All the above
The planet that is known as earth's twin is
Mercury
Venus
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Mars
The enormous energy released in nuclear and thermonuclear reactions is due to conversion of
chemical energy into heat energy
mechanical energy into heat energy
protons into neutrons
mass into energy according to Einstein's equation
Which part of the eye photographic camera?
Lens
Iris
Retina
Eyelid
Separating particles from a suspension is effected by
centrifugal force
frictional force
gravitational force
distillation
If you want to open a door with les difficulty you push it
at the middle
at a point away from the hinge (near the rim)
near the hinge
None of the above
A person does not sink in the Dead Sea because
the sea contains a large amount of other salts besides sodium chloride
the density of the person is less than the density of the Dead Sea water
of the surface tension due to salt water in the Dead Sea
of difference in mass
The colour or an opaque object is due to the colour it
absorbs
refracts
reflects
scatters
The largest planet in the solar system is
Neptune
Uranus
Jupiter
Saturn
The velocity of sound in air increases with
the rise of temperature
rise of its frequency
decrease in humidity
fall of temperature
Frictional force acts in
the same direction as the motion
the opposite direction of the motion
all the directions
upward direction
Nuclear fusion is a process in which
the atoms and molecules lose their identity
nucleus is split into fragments
the nuclear reaction between two light atomic nuclei results in the formation of a heavier nucleus with release of a large quantity of nuclear energy in the process
absorption of neutron by a nucleus
Among the following the most suitable material for the core of an electro-magnet is
steel
wood
soft iron
copper
The inability of a body to change its state of rest or uniform motion along a straight line is called its
momentum
velocity
acceleration
inertia
Which is the densest planet of the solar system?
Sun
Jupiter
Mercury
Earth
The Cact that the compass needle does not point true north was observed first by
Sir Isaac Newton
Columbus
Archimedes
Thomas Alva Edison
Acoustics' la a branch or study dealing with
historical sites
architecture
sound
trigonometry
Rain drops acquire spherical shape due to
viscosity
surface tension
friction
elasticity
A device used in a ship for the purpose of measuring the depth of the sea is
an altimeter
a fathometer
a hydrometer
a sonometer
Changing of one element into another element is known as
transmutation
fission
fusion
radioactivity
The heating element often used in an electric iron is
copper
tungsten
mica
nichrome
Why is it cool near an open pond on a hot summer day?
Evaporation at the surface causes cooling
The heat obsorbed at the surface is passed on to the bottom
Because of impurity in the water
Because of convection currents set up inside water
A photon is
a quantum of electromagnetic radiation
light source used in photography
a photo film
sun-light
When sound waves travel from one medium to another, the quantity which remains unchanged is its
speed
frequency
wavelength
All the above
The planet that moves fastest around the sun is
Mars
Venus
Earth
Mercury
In an oil lamp, holes are provided below the chimney so that
necessary oxygen for burning of oil may be provided
the convection current of air may be maintained to keep the lamp burning
the brightness of the lamp may be increased
All the above