The problem of pumping out water from the flooded mines provided the need of self-working engine, which led James Watt to invent the same.
Thus, both A and R are true & R correctly explains A.
The kerosene oil sprayed on the water provodes a thin cating and the larvae of the mosquitoes are prevented from coming up to breathe. Thus, they die.
Hence, A is true but R is false.
Iron expands in summer. So, gaps are left between rails to allow for expansion.
Alluvial soils comprising of silt and sand carried down by the rivers, are very fertile. However, cotton is grown in black soil that suits its mineral requirements
When in winter, hot water is poured in the glass tumbler. its inner surface tends to expand while the Outer surface in contact with cold atmosphere does not. This opposite interaction causes the tumbler to break.
Carbon monoxide, when inhaled, combines with haemoglobin of blood to form carboxyhaemoglobin which inhibits the transport of oxygen.
Magnesium chloride present in common salt is a deliquescent substance i.e. it absorbs moisture from the air when kept in open.
Rainfall in Tamil Nadu is caused by the retreating monsoons which occur in winter.
litutmish was a ruler of slave dynasty and Razia was his daughter.
The Indian Constitution came into force with effect from January 26, 1950 and since then this day is celebrated as the Republic Day.
Silver is a good conductor of electricity but it is not used to make electric wires because it is expensive
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