Q.1 Fire due to petrol cannot be extinguished by pouring water over it why?
ANS.. this due to haviness of water, which ships down and petrol comes down and petrol comes on the surface and continues burning
Q.2 what will happen if the force of gravity disappear on earth ?
ANS.. all living objects of earth will float on the earth
Q.3 The gas usually filled in the electric bulb is?
ANS.. nitrogen
Q.4 Quartz crystals normally used in quartz clocks etc. is chemically?
ANS.. silicon dioxide
Q.5 The hardest substance available on earth is.?
ANS..Diamond
Q.6 The variety of coal in which the deposit contains recognizable traces of the original plant material is.?
Ans.. peat
Q.7The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is?
ANS.. helium
Q.8 The gases used in different types of welding would include?
ANS.. oxygen and acetylene
Q.9 The average salinity of sea water is?
ANS.. 3.5%
Q.10 Heavy water is?
ANS..deuterium oxide
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