Which of the following is the most suitable catalyst for ammonia synthesis ?
A. Pt
B. ZnO + Cr2O3
C. Fe in fused mixture of Al2O3 + SiQ2 + MgO
D. All of the above
Submitted by :- Jamil Ahmed
mnsoomro
Which of the following is macronutrient ?
A. Cu
B. Cl
C. H
D. Zn
Submitted by :- Jamil Ahmed
Which of the following is incorrect statement about nitrogen importance ?
A. It enhances plant growth
B. It is involved in the synthesis of protein and nucleic acids
C. it accelerates fruits and flowers growth
D. It is involved in the chlorophyll synthesis
Submitted by :- Jamil Ahmed
The important function of burning zone in the rotary kiln is __________________?
A. to dry the moisture of slurry
B. to decompose lime stone to unslaked lime
C. combination of different oxides like CaO SiO2 Fe2O3 and Al2O3
D. to reduce the impurities
Submitted by :- Jamil Ahmed
The composition of mixture of clay and lime stone in the raw for cement material is __________________?
A. 75% lime stone and 25% clay
B. 25% lime stone and 75% clay
C. 15% lime stone and 55% clay
D. 55% lime stone and 15% clay
Submitted by :- Mansoor Khan
Which sequence of steps is correct for the manufacture of cement ?
A. crushing heating mixing grinding
B. crushing mixing heating grinding and mixing
C. crushing grinding mixing heating
D. mixing heating grinding crushing
Submitted by :- Jamil Ahmed
Cement is a mixture of so many compounds roasted in rotary kiln. Which substances has greater percentage ?
A. Lime (CaO)
B. Silica (SiO2)
C. Alumina (Al2O3)
D. Magnesia (MgO)
Submitted by :- Jamil Ahmed
Cement is a mixture of________________?
A. clay and clinker
B. clay lime stone and gypsum
C. lime stone and gypsum
D. lime stone and clay
Submitted by :- Jamil Ahmed
Which one of the following fertilizers provides the nitrogen and phosphorus to the plant ?
A. urea C. diammonium phosphate
B. calcium superphosphate D. potassium nitrate
Submitted by :- Jamil Ahmed
The percentage of nitrogen in urea is________________?
A. 36%
B. 46%
C. 56%
D. 66%
Submitted by :- Jamil Ahmed