Chemistry MCQs

Page No. 57

Which of the following is incorrect statement about nitrogen importance ?


aIt enhances plant growth


bIt is involved in the synthesis of protein and nucleic acids


cit accelerates fruits and flowers growth


dIt is involved in the chlorophyll synthesis



The important function of burning zone in the rotary kiln is __________________?


ato dry the moisture of slurry


bto decompose lime stone to unslaked lime


ccombination of different oxides like CaO SiO2 Fe2O3 and Al2O3


dto reduce the impurities



The composition of mixture of clay and lime stone in the raw for cement material is __________________?


a75% lime stone and 25% clay


b25% lime stone and 75% clay


c15% lime stone and 55% clay


d55% lime stone and 15% clay



Which sequence of steps is correct for the manufacture of cement ?


acrushing heating mixing grinding


bcrushing mixing heating grinding and mixing


ccrushing grinding mixing heating


dmixing heating grinding crushing



Cement is a mixture of so many compounds roasted in rotary kiln. Which substances has greater percentage ?


aLime (CaO)


bSilica (SiO2)


cAlumina (Al2O3)


dMagnesia (MgO)


View Answer Lime (CaO)

Cement is a mixture of________________?


aclay and clinker


bclay lime stone and gypsum


clime stone and gypsum


dlime stone and clay



Which one of the following fertilizers provides the nitrogen and phosphorus to the plant ?


aurea


bcalcium superphosphate


cdiammonium phosphate


dpotassium nitrate


View Answer diammonium phosphate

The percentage of nitrogen in urea is________________?


a36%


b46%


c56%


d66%


View Answer 46%

Which one of the following set of raw material is most suitable for manufacture of urea ?


aCH4 N2 and CO2


bH2 N2 and CO


cH2 CO2 and H2O


dH2O N2 and H2


View Answer CH4 N2 and CO2

How many zones through which the charge passes in a rotary kiln ?


a4


b3


c2


d5


View Answer 4

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