Related Questions

For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
A 1 : 2
B 1 : 3
C 1 : 4
D 1 : 6
Cement containing excess amount of lime
A Cracks during setting
B Becomes more strong
C Is slow setting
D Is quick setting
Which one of the following soil types of India is rendered infertile by the presence of excess iron?
A Desert sand
B Alluvial
C Podzolic
D Lateritic
Presence of excess flourine in water causes
A Dental cavity
B Tooth decay
C Fluorosis
D Respiratory disease
The ‘Green House effect’ is produced due to the presence of excess amount of
A Sulphur dioxide
B Nitrogen dioxide
C Carbon monoxide
D Methane
The presence of solid, liquid or gaseous compounds, which may not be normally present, or in excess concentration in the atmosphere is called
A air pollution
B water pollution
C soil pollution
D radioactive pollution
Heating of an ore below its melting point in presence of excess of air is called
A Calcination
B Smelting
C Roasting
D Sublimation
During conversion of ammonium carbamate into urea, presence of large excess of water
A Increases the yield of urea
B Adversely affects the yield of urea
C Reduces the evaporator load by diluting the urea solution
D Does not affect the yield of urea
The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?
A 49 : 48
B 7 : 7
C 8 : 6\
D 3 : 4
Initial setting time of cement for asbestos cement products should be not less than
A 30 minutes
B 50 minutes
C 75 minutes
D 90 minutes

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