The recent atomic weight scale is based on
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The type of glass used in making prisms and lenses is
Which of the following elements is a metal
Permanent hardness of water can be removed by adding
Which of the following parts of the sun is easily visible only during a total solar eclipse?
The most important ore of Aluminium is
According to Daltons atomic theory the smallest particle which can exist independently is
Earth's seasons are caused by which of the following?
Water has maximum density at
Pollination by birds is called
The oxide of Nitrogen used in medicine as anaesthetic is
The metallic constituents of hard water are
Which of the following elements is obtained from sea weeds ?
Which of the following is commonly called a polyamide ?
Which of the following characters is not shown by hydrogen
Lightening cause rainfall because
The hardest substance available on earth is
Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
Brass gets discoloured in air due to the presence of which gas in air
What is the unit for measuring the pitch or frequency of sound ?
Polythene is industrially prepared by the polymerisation of
The speed of light with the rise in the temperature of the medium
The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
The removal of top soil by water or wind is called
The intencity of Earthquakes is measured on
Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
The solar eclipse occurs when
When a gas is turned into a liquid, the process is called
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