The age of most ancient geological formations is estimated by
1 Potassium-argon method
2 Ra-Si method
4 Uranium-lead method
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Who commanded the challenger’s first flight?
Which of the following is used in making smoke bombs? 1 Sulphur 2 phosphorus 3 Hydrogen 4 Carbon
Which are known as non - luminous irregular nebulae?
The type of glass used in making lenses and prisms is 1 Soft glass 2 Pyrex glass 3 Jena glass 4 Flint glass
What are quasars?
The inert gas which is substituted for nitrogen in the air, used by deep sea divers for breathing, is 1 Helium 2 Argon 3 Krypton 4 Xenon
what are advantages & disadvantages of science?
Which of the following is a chemical change? 1 Rusting of iron 2 Tempering of iron 3 Melting of iron 4 Bending of iron
Which is/are the important raw material(s) required in cement industry? 1 Limestone 2 Gypsum & clay 3 Clay 4 Limestone & clay
What does the Haversion central canal in each osteon contains?
Which of the following substances undergoes chemical change on heating? 1 Sodium chloride 2 Silica 3 Lead nitrate 4 Platinum wire
The recent atomic weight scale is based on 1 1H1 2 1H2 3 6C12 4 8O16