Which layer protects earth from harmful rays of the Sun? Magnetosphere Ozone layer Troposphere Ionosphere TRUE ANSWER : ? YOUR ANSWER : ?
In vulcanisation, natural rubber is heated with Phosphorous Carbon Silicon Sulphur TRUE ANSWER : ? YOUR ANSWER : ?
Among the various allotrope of carbon Coke is the hardest, graphite is the softest Diamond is the hardest, lamp black is the softest Diamond is the hardest, graphite is the softest Diamond is the hardest, coke is the softest TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the lightest metal? Mercury Lead Silver Lithium TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following has a least penetrating power? All have same penetrating power Gamma rays Beta Particles Alpha particles TRUE ANSWER : ? YOUR ANSWER : ?
The two elements that are frequently used for making transistors are Silicon and Germanium Iridium and Tungsten Boron and Aluminium Niobium and Columbium TRUE ANSWER : ? YOUR ANSWER : ?
'No two electrons in an atom can have the same set of four quantum numbers' is Newton's law Pauli's exclusion principle Aufbau principle Bohr's law TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is used in pencils? Phosphorous Silicon Graphite Charcoal TRUE ANSWER : ? YOUR ANSWER : ?
The vast resources of unutilised natural gas can be used in the production of Fertilisers Graphite Carbide Synthetic petroleum TRUE ANSWER : ? YOUR ANSWER : ?