The type of glass used in making prisms and lenses is
Pyrex glass
Soft glass
Flint glass
Jena glass
Correct Answer :
C. Flint glass
Related Questions
Permanent hardness of water can be removed by adding
Potassium Permanganate
Bleaching Powder
Chlorine
Washing Soda
Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
A piece of iron that is not a permanent magnet
The north pole of another permanent magnet
A positively charged glass rod
A negatively charged rubber rod
Lightening cause rainfall because
It activate H2O molecule
Photo-electricity reaction starts
Some of the gas molecules become bigger
It cause combination of oxygen and nitrogen
The type of glass used in making prisms and lenses is
Pyrex glass
Soft glass
Flint glass
Jena glass
Brass gets discoloured in air due to the presence of which gas in air
Carbon dioxide
Hydrogen Sulphide
Oxygen
Nitrogen
The chemial name of Uria is
Carbamide
Chloroetane
Aneurin
None of these
Which of the following parts of the sun is easily visible only during a total solar eclipse?
core
photosphere
sunspots
corona
What is the unit for measuring the pitch or frequency of sound ?
Coulomb
Hum
Cycles
Decible
Old-written material, which cannot be read easily can be read by
None of these
Ultraviolet rays
Infra Red rays
Cosmic Rays
Water has maximum density at
0°C
-4°C
100°C
4°C
The smallest functional and structural unit of kidney is called as
Granulocyte
Neuron
Reticulocyte
Nephron
The recent atomic weight scale is based on
1H1
1H2
6C12
8O16
Epoxy resins is used as
Adhesives
Detergents
Insecticides
Moth repellants
Pollination by birds is called
autogamy
entomophily
anemophily
ornithophily
The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
Earthquakes
Magnetic reversals
Hurricanses
Increased deposition of deep-sea sediments
Nitrification means
Conversion of nitrogen to nitric acid.
Production of nitrogen from air
Convert the atmospheric nitrogen to effective nitrogen compound.
Liquifaction of nitrogen
The colour of Emerald is
Deep Green
Violet
Prussian Blue
Yellow
The fastest acting enzyme in the biological kingdom is
amylase
lipase
carboxypeptidase
carbonic anhydrase
Quartz crystals normally used in quartz clocks etc. is chemically
A mixture of B and C
Silicon dioxide
Germenium dioxide
Sodium Silicate
The property of a substance to absorb moisture from the air on exposure is called
Desiccation
Efflorescence
Deliquescene
Osmosis
In an atomic nucleus, neutrons and protons are held together by
Magnetic forces
Gravitational forces
Coulombic forces
Exchange forces
Liquefied Petroleum gas (LPG) consists of mainly
Methane, Butane and Propane
Methane, Ethane and Hexane
Ethane, Hexane and Nonane
Methane, Hexane and Nonane
Which of the following elements is non-radioactive?
Uranium
Plutonium
Thorium
Zirconium
Which of the following elements is obtained from sea weeds ?
Argon
Vanadium
Iodine
Sulphur
The Panda belongs to the same family as that of
Cat
Bear
Rabbit
Dog
The solar eclipse occurs when
the sun comes in between the moon and the earth
the moon comes in between the sun and the earth
the earth comes in the between the sun and the moon
None of the above
The element present in the largest amount in rocks and minerals is
Carbon
Hydrogen
Aluminium
Silicon
The removal of top soil by water or wind is called
Soil erosion
Soil wash
Silting of soil
Soil creep
Earth's seasons are caused by which of the following?
The varying amount of sunspot activity
The tilt of the earth's rotation relative to the ecliptic as earth revolves around the sun
The earth's orbit around the sun as an exlipse rather than a circle
The rotation of during a 24-hour day
Polythene is industrially prepared by the polymerisation of
styrene
methane
ethylene
acetylene