(A) Fluorine
(B) Nitrogen
(C) Oxygen
(D) Neon
Addition of gypsum to Portland cement helps in?
(A) Increasing the strength of cement
(B) Rapid setting of cement
(C) Preventing rapid setting of cement
(D) Reduction in the cost of cement
Percentage of carbon in steel ranges from?
(A) 0.1 to 1.5
(B) 1.5 to 3.0
(C) 3.0 to 4.0
(D) 4.0 to 6.0
An emulsion is a colloid of a?
(A) Gas in a solid
(B) Liquid in a gas
(C) Gas in a liquid
(D) Liquid in a liquid
One of the following is used to dissolve noble metals. That is?
(A) Aqua Ragia
(B) Sulphuric acid
(C) Hydrochloric acid
(D) Nitric acid
Lustre of the metals is because of?
(A) High density due to closed packing of atoms.
(B) High polish.
(C) Reflection of light due to the presence of free electrons.
(D) Absorption of light due to the presence of cavities.
Buckey-balls are basically the allotropes of?
(A) Calcium
(B) Phosphorous
(C) Carbon
(D) Sulphur
Purity of gold is expressed in carats. The purest form of gold is?
(A) 24 Carats
(B) 99.6 Carats
(C) 91.6 Carats
(D) 22 Carats