A mixture of iron filings and sand can be separated by
1 Heating
2 Sublimation
3 Hand picking
4 Magnetic separation
The high-temperature superconductors are 1 Metal alloys 2 Ceramic oxides 3 Inorganic polymers 4 Pure rare earth metals
The major ingredient of leather is 1 Carbohydrate 2 Collagen 3 Polymer 4 Nucleic acid
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The wavelength of X-ray is of order of 1 1 cm 2 1m 3 1 Angstrom 4 10 micron
Reaction of alcohol, with a carboxylic acid is known as 1 Substitution Reaction 2 Addition reaction 3 Esterification 4 Hydrogenation
Ozone attacks 1 Mercury and silver 2 Copper 3 Silver and iron 4 None of these
Which of the following was to be discovered first in the chromo sphere of the sun? 1 Xenon 2 Helium 3 Neon 4 Krypton
it is not advisable to sleep under a tree at night becouse trees release
The gas usually filled in the eletric h\bulb is 1 Hydrogen 2 Oxygen 3 Nitrogen 4 Carbon dioxide
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which country is known as thunderbolt in the world
Which of the following colors in he visible spectrum has maximum range? 1 Violet 2 Indigo 3 Orange 4 Red