Bissoy.com
Doctors Medicines MCQs Q&A

A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. This POP -

A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. This POP - Correct Answer cannot be reversed

Concept:

  • Plaster of Paris (POP):
    • A white coloured building material.
    • Used as a protective and decorative coating on the walls during the construction of buildings.
    • A common type of POP is gypsum  lime POP and cement POP (Based on the ingredients in it).
    • It is powdery in nature.
    • It is mixed with water just before using that it can maintain its consistency.
    • As it is mixed with water the powder gets crystallised and liberates heat to become rigid.
    • It is also referred to as Gypsum plaster.
    • The chemical formula of plaster of Paris is CaSo4.H2o or 2CaSO4.H2O.
  • Uses of Plaster of Paris: 
    • It is used to put casts around fractured bones in the medical department of orthopedics.
    • Used by the dentists to make moulds of teeth that are to be replaced.
    • Used to make sculptures and metal castings.

Explanation:

  • Plaster of Paris (POP) it is  manufactured by heating gypsum at 150° C

CaSO4.2H2O+ Heat → CaSO4.5H2O + 1.5H2O.

  • On heating gypsum at 423 K, it loses water molecule and becomes calcium sulfate hemihydrate.
  • When it becomes hard on cast over a fractured bone then it cannot be reversed.
  • Hence cannot be reversed is the correct answer.

Additional Information

  • If POP is not handled properly then it can be harmful and dangerous. upon Inhalation, it can lead to permanent lung damage and other ailments
  • There are three types of plaster of Paris. Gypsum Plaster, Lime plaster, Cement Plaster.

Related Questions

Immobilised lactase is used to hydrolyse lactose in dairy waste to glucose and galactose. Enzyme is immobilised in resin particles and packed into a 0.5 m3 column. The total effectiveness factor for the system is close to unity; Km for the immobilised enzyme is 1.32 kg m-3; Vmax is 45 kg m-3 h-1. The lactose concentration in the feed stream is 9.5 kg m-3; a substrate conversion of 98% is required. The column is operated with plug flow for a total of 310 d per year. At what flow rate should the reactor be operated?
Statement 1: Drying is used for preservation of food. Statement 2: Convective drying is indirect drying and conductive drying is direct drying.
200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)
A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)
Post office protocol (POP) is a message access protocol which is used to extract message for client. In this regard, which of the following are true ? (A) POP has two modes, Delete mode and keep (B) In Delete mode, mail is deleted from mail box after each retrival (C) In Delete mode, mail is deleted from mail box before each retrieval (D) In keep mode, mail is deleted before retrival (E) In keep mode, mail remains in mail box after retrival Choose the correct answer from the options given below:
In each of the following question below are given some statements followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusion logically follows the given statements. Statements: I. Some tooth are paste. II. Some paste are gel. Conclusions: I. Some tooth are gel. II.All paste are gel. III. All tooth are gel.
A dryer is used for drying pears which has initial moisture content of 70 % (wet basis) and final moisture content of 5 % (wet basis). An experimental drying curve for the product indicates that the critical moisture content is 25 % (wet basis) and the time for constant drying is 5 min. Can you estimate the total drying time for product?
Simplify : $${{{5 \over 3} \times {7 \over {51}}{\text{ of }}{{17} \over 5} - {1 \over 3}} \over {{2 \over 9} \times {5 \over 7}{\text{ of }}{{28} \over 5} - {2 \over 3}}}$$
Gypsum plaster, or plaster of Paris, is produced by heating __________ to about 300 °F.
The term _______________ plaster is used to indicate plaster of Paris with retarder.