Brass gets discoloured in air due to the presence of which gas in air
Carbon dioxide
Hydrogen Sulphide
Oxygen
Nitrogen
Correct Answer :
B. Hydrogen Sulphide
Related Questions
The hardest substance available on earth is
Platinum
Quartz
gold
Diamond
Apparatus invented by Archimedes is :
Pulley
Microscope
Thermemoter
Barometer
The recent atomic weight scale is based on
1H1
1H2
6C12
8O16
Which of the following characters is not shown by hydrogen
It burns in air to form water
It supports combustion
It readily combines with fluorine and chlorine
It combines with almost all metals forming hydrides
Epoxy resins is used as
Adhesives
Detergents
Insecticides
Moth repellants
The fastest acting enzyme in the biological kingdom is
amylase
lipase
carboxypeptidase
carbonic anhydrase
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
Old-written material, which cannot be read easily can be read by
None of these
Ultraviolet rays
Infra Red rays
Cosmic Rays
The metal used in storage batteries
Zinc
Iron
Copper
Lead
Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
Sulphonates
Zeolites
Nitrates
None of these
The smallest functional and structural unit of kidney is called as
Granulocyte
Neuron
Reticulocyte
Nephron
The colour of Emerald is
Deep Green
Violet
Prussian Blue
Yellow
The chemial name of Uria is
Carbamide
Chloroetane
Aneurin
None of these
Which of the following is in liquid form at room temperature ?
Sodium
Cerium
Francium
Lithium
The location and energy of an electron in an atom can be specified by
Atomic number
Atomic mass
Quantum numbers
None of these
The type of glass used in making prisms and lenses is
Pyrex glass
Soft glass
Flint glass
Jena glass
What is the unit for measuring the pitch or frequency of sound ?
Coulomb
Hum
Cycles
Decible
The speed of light with the rise in the temperature of the medium
Increases
Remains unaltered
Drops sharply
Decreases
In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If both inputs are positive the output is zero. This is
an AND circuit
an OR circuit
a high-pass filter
a NOR circuit
Which of the following elements is non-radioactive?
Uranium
Plutonium
Thorium
Zirconium
Polythene is industrially prepared by the polymerisation of
styrene
methane
ethylene
acetylene
Which of the following elements is obtained from sea weeds ?
Argon
Vanadium
Iodine
Sulphur
Which of the following elements is a metal
S
Ga
Se
I
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
Which of the following is commonly called a polyamide ?
Orion
Terylene
Rayon
Nylon
One fathom is equal to
6 feet
6 metres
60 cms
60 feet
The element present in the largest amount in rocks and minerals is
Carbon
Hydrogen
Aluminium
Silicon
Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere in future?
Atomic warfare
Depletion of earth's ozone layer
CO2 from fossil fuels
Dust clouds from valcanoes
The most important ore of Aluminium is
Calamine
Calcite
Galena
Bauxite
The metallic constituents of hard water are
Calcium, magnesium and iron
Magnesium, Calcium and tin
Magnesium, tin and iron
Iron, tin and calcium