Which of the following elements is non-radioactive?
Uranium
Plutonium
Thorium
Zirconium
Correct Answer :
D. Zirconium
Related Questions
The metallic constituents of hard water are
Calcium, magnesium and iron
Magnesium, Calcium and tin
Magnesium, tin and iron
Iron, tin and calcium
Rust is
A mixture of FeO and Fe(OH)2
A mixture of Fe2O3 and Fe(OH)2
A mixture of Fe2O3, 3H2O and FeO
FeO only
Quartz crystals normally used in quartz clocks etc. is chemically
A mixture of B and C
Silicon dioxide
Germenium dioxide
Sodium Silicate
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
Bromine is
A Black solid
A red liquid
A highly inflammable gas
colourless gas insoluble in water
The formula of Plaster of Paris is
2CaSO4, H2O
CaSO4
CaSO4, 2H2O
2CaSO4, 4H2O
Pollination by birds is called
autogamy
entomophily
anemophily
ornithophily
Cell membrane is
permeable
semipermeable
selectively permeable
impermeable
The removal of top soil by water or wind is called
Soil erosion
Soil wash
Silting of soil
Soil creep
The element present in the largest amount in rocks and minerals is
Carbon
Hydrogen
Aluminium
Silicon
Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
Sulphonates
Zeolites
Nitrates
None of these
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
What is the unit for measuring the pitch or frequency of sound ?
Coulomb
Hum
Cycles
Decible
Polythene is industrially prepared by the polymerisation of
styrene
methane
ethylene
acetylene
Liquefied Petroleum gas (LPG) consists of mainly
Methane, Butane and Propane
Methane, Ethane and Hexane
Ethane, Hexane and Nonane
Methane, Hexane and Nonane
Permanent hardness of water can be removed by adding
Potassium Permanganate
Bleaching Powder
Chlorine
Washing Soda
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
The most important ore of Aluminium is
Calamine
Calcite
Galena
Bauxite
Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous glass called
Carbon Monoxide
Phosgene
Phosphine
None of these
Which of the following elements is a metal
S
Ga
Se
I
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 recent atomic weight scale is based on
1H1
1H2
6C12
8O16
Water has maximum density at
0°C
-4°C
100°C
4°C
The fastest acting enzyme in the biological kingdom is
amylase
lipase
carboxypeptidase
carbonic anhydrase
Nitrification means
Conversion of nitrogen to nitric acid.
Production of nitrogen from air
Convert the atmospheric nitrogen to effective nitrogen compound.
Liquifaction of nitrogen
Glass is made from the mixture of
Quartz and mica
Sand and salt
Sand and silicates
None of these
The speed of light with the rise in the temperature of the medium
Increases
Remains unaltered
Drops sharply
Decreases
Old-written material, which cannot be read easily can be read by
None of these
Ultraviolet rays
Infra Red rays
Cosmic Rays
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
In an atomic nucleus, neutrons and protons are held together by
Magnetic forces
Gravitational forces
Coulombic forces
Exchange forces