Old-written material, which cannot be read easily can be read by
None of these
Ultraviolet rays
Infra Red rays
Cosmic Rays
- Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
- Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
- Quartz crystals normally used in quartz clocks etc. is chemically
- Polythene is industrially prepared by the polymerisation of
- Which of the following elements is a metal
- The solar eclipse occurs when
- The oxide of Nitrogen used in medicine as anaesthetic is
- Which of the following characters is not shown by hydrogen
- The Panda belongs to the same family as that of
- Rust is
- Glass is made from the mixture of
- Brass gets discoloured in air due to the presence of which gas in air
- Which of the following is in liquid form at room temperature ?
- The most important ore of Aluminium is
- The chemial name of Uria is
- Earth's seasons are caused by which of the following?
- According to Daltons atomic theory the smallest particle which can exist independently is
- One fathom is equal to
- The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
- The fastest acting enzyme in the biological kingdom is
- The smallest functional and structural unit of kidney is called as
- Permanent hardness of water can be removed by adding
- Water has maximum density at
- Which of the following elements is obtained from sea weeds ?
- The colour of Emerald is
- The element present in the largest amount in rocks and minerals is
- Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
- Bromine is
- The removal of top soil by water or wind is called
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