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
The metal that is present in photo films is 1 Mercury 2 Platimnum 3 Magnesium 4 Silver
Carbon tetrachloride fire extinguisher should not be used in closed rooms, because it produces a poisonous gas called 1 Carbon monoxide 2 Phosphine 3 Phosgene 4 None of these
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What is one light second?
Water is a compound because 1 It exists as a solid, a liquid or a gas 2 It contains hydrogen and oxygen 3 It contains two different elements joined by chemical bonds 4 It cannot be split up into simpler substances by chemical means
name all the density all cloth,metals,materials?
Wood is the main raw material for the manufacture of 1 Paint 2 Paper 3 Ink 4 Gun powder
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Bell metal is an alloy of 1 Brass an nickel 2 Zinc and copper 3 Tin and copper 4 None of these
Using an applied force of a Newton across one meter is known as a:
Which of the following is a good nuclear fuel? 1 Uranium-238 2 Neptunium-239 3 Thorium-236 4 Plutonium-239
where the 3rd earthsummit held
which of the following fibers is generally preferred for making gauze and lint? 1 Cotton 2 Rayon 3 Nylon 4 Terylene