Top 500+ TRB Chemistry Model Question Paper with Answers - 4

Question: 16

Which one of the following glasses is used in bullet proof screens?

(A) Jena glass

(B) Reinforced glass

(C) Pyrex glass

(D) Soda glass

Question: 17

Which one of the following is not present in cement?

(A) Gypsum

(B) Cay

(C) Alumina

(D) Alum

Question: 18

Which of the following is not a fullerene?

(A) C₂

(B) C₅₀ 

(C) C₆₀ 

(D) C₁₂₀ 

Question: 19

The average salinity of sea water is

(A) 2%

(B) 2.5%

(C) 3%

(D) 3.5%

Question: 20

Mildness of shaving cream is enriched by which one of the following?

(A) Sodium silicate

(B) Free fatty acid

(C) Sodium chloride

(D) Potassium carbonate