Q. Atomic number of an element gives -
1) The number of protons in its atom
2) The number of nucleons in its atom
3) The weight of the atom of the element
4) The total number of elementary particles in its atom
Q. The major source of the pollutant gas, carbon mono-oxide (CO), in urban areas is -
1) Thermal power sector
2) Transport sector
3) Industrial sector
4) Domestic sector
Q. Silica content of granodiorite is in the range of -
1) 22-44%
2) 66-88%
3) 44-56%
4) 44-66%
Q. From which mineral is radium obtained -
1) Limestone
2) Haematitie
3) Pitchblende
4) Rutile
Q. Addition of ethylene dibromide to petrol -
1) increases the octane number of fuel
2) helps elimination of lead oxide
3) removes the sulphur compound in petrol
4) serves as a substitute of tetraethyl lead
Q. Which one of the following gases is supporter of combustion?
1) Hydrogen
2) Nitrogen
3) Carbon dioxide
4) Oxygen
Q. Iron sheet kept in moist air gets covered with rust. Rust is -
1) an element
2) a compound
3) a mixture of iron and dust
4) a mixture of iron, oxygen and water
Q. Nitric oxide pollution can lead to all of the following, except -
1) leaf spotting in plants
2) bronchitis-related respiratory problems in human
3) production of corrosive gases through photochemical reaction
4) silicosis in human
Q. Which of the following are the two main constituents of granite?
1) Iron and silica
2) Iron and silver
3) Silica and aluminium
4) Iron oxide and potassium
Q. The pure form of carbon is -
1) Diamond
2) Graphite
3) Charcoal
4) Fullerence
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