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The hardest substance available on earth is
1 Platinum
2 Coal
3 Diamond
4 Gold
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In an atomic nucleus, neutrons and protons are held together by 1 Gravitational forces 2 Magnetic forces 3 Exchange force 4 Coulombic forces
why nitrogen is about 70%(i.e.)highest percentage in environment
PVC is obtained by the polymerization of 1 Propene 2 Vinyl chloride 3 Styrene 4 Acetylene
What is the Embrylogy ?
The wavelength of X-ray is of order of 1 1 cm 2 1m 3 1 Angstrom 4 10 micron
neel armstrong belongs to which country ?
An atom of an element with mass number 23 and atomic number 11 will have 1 11 neutrons, 12 protons and 11 electrons 2 11 protons, 12 neutrons and 11 electrons 3 11 neutrons, 11 protons and 12 electrons 4 23 protons and 11 electrons
In which year the solar observatory in kodikanal founded?
Which of the following is a chemical change? 1 Magnetization of iron 2 Melting of ice 3 Burning of sulphur 4 Melting of wax
Polythene is industrially prepared by the polymerization of 1 Methane 2 Styrene 3 Acetylene 4 Ethylene
3 Answers Amna Industries, HFI,
Soap is a mixture of sodium or potassium salts of 1 Monocarboxylic acids 2 Glycerol’s 3 Dicarboxylic acids 4 Tricarboxylic acids
The major ingredient of leather is 1 Carbohydrate 2 Collagen 3 Polymer 4 Nucleic acid
Biological Sciences 
