Practice Pakistan's most useful MCQs for competitive exams

Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is ____________ °C?

• (A)  -5 to 0
• (B)  5 to 10
• (C)  30 to 50
• (D)  75 to 80

Answer

Submitted By :Ali Uppal

Reverse osmosis is normally used for the_______________?

• (A)  Separation of isotopes of uranium from gaseous uranium hexafluoride
• (B)  Separation of helium from natural gas
• (C)  Desalination of brackish water to produce potable (drinking) water
• (D)  Purification of oxygen

Answer

Submitted By :Ali Uppal

Main use of hydrazine is___________________?

• (A)  As a rocket fuel
• (B)  In water treatment
• (C)  As a disinfectant
• (D)  As fire retardant

Answer

Submitted By :Ali Uppal

Dehydrogenation of ethyl benzene produces __________________ ?

• (A)  Styrene
• (B)  Naphthalene
• (C)  Phenol
• (D)  Benzoic acid

Answer

Submitted By :Ali Uppal

In primitive days, _____________ was being manufactured by Leblanc Process ?

• (A)  Alum
• (B)  Washing soda
• (C)  Soda ash
• (D)  Calcium carbide

Answer

Submitted By :Ali Uppal

Good quality of edible salt is obtained from brine by the process of__________________?

• (A)  Solar evaporation
• (B)  Vacuum evaporation
• (C)  Freeze drying
• (D)  Electrolysis

Answer

Submitted By :Ali Uppal

______________ is produced by the dehydrogenation of ethyl benzene ?

• (A)  Styrene
• (B)  Ethyl alcohol
• (C)  Cumene
• (D)  Phenol

Answer

Submitted By :Ali Uppal

Catalytic oxidation-dehydrogenation of methyl alcohol produces__________________?

• (A)  Formaldehyde
• (B)  Phenol
• (C)  Acetone
• (D)  Maleic anhydride

Answer

Submitted By :Ali Uppal

A unit operation is exemplified by the process of ___________________?

• (A)  Reduction
• (B)  Desorption
• (C)  Nitration
• (D)  Combustion

Answer

Submitted By :Ali Uppal

____________ is a polysaccharide?

• (A)  Maltose
• (B)  Starch
• (C)  Sucrose
• (D)  Glucose

Answer

Submitted By :Ali Uppal