Dry Heat Sterilization

Dry Heat Sterilization

Q. 1

Incineration is not done for:

 A

Cytotoxic drugs

 B

Cotton contaminated with blood

 C

Waste sharps

 D

Human tissue

Q. 1

Incineration is not done for:

 A

Cytotoxic drugs

 B

Cotton contaminated with blood

 C

Waste sharps

 D

Human tissue

Ans. C

Explanation:

Waste sharps Repeat from May 11


Q. 2

The best method of sterilizaion of dusting powder is‑

 A

Autoclaving

 B

Hot air oven

 C

Inspissation

 D

Tyndallisation

Q. 2

The best method of sterilizaion of dusting powder is‑

 A

Autoclaving

 B

Hot air oven

 C

Inspissation

 D

Tyndallisation

Ans. B

Explanation:

Ans. is ‘b’ i.e., Hot air oven


Q. 3

Oil and grease are sterilised by-(

 A

Hot air oven

 B

Autoclaving

 C

Filtration

 D

Irradiation

Q. 3

Oil and grease are sterilised by-(

 A

Hot air oven

 B

Autoclaving

 C

Filtration

 D

Irradiation

Ans. A

Explanation:

Ans. is ‘a’ i.e., Hot air oven


Q. 4

Hot air oven is used for sterilization of all except –

 A

Glass wares

 B

Dusting powder

 C

Sharp instruments

 D

None

Q. 4

Hot air oven is used for sterilization of all except –

 A

Glass wares

 B

Dusting powder

 C

Sharp instruments

 D

None

Ans. D

Explanation:

Ans. is ‘None’


Q. 5

Hospital dressing is best disposed off by –

 A

Incineration

 B

Dumping

 C

Autoclaving

 D

Burying

Q. 5

Hospital dressing is best disposed off by –

 A

Incineration

 B

Dumping

 C

Autoclaving

 D

Burying

Ans. A

Explanation:

Ans. is ‘a’ i.e., Incineration


Q. 6

InPHC how to dispose placenta-

 A

Incineration

 B

Microwaving

 C

Autoclaving

 D

Chemical treatment

Q. 6

InPHC how to dispose placenta-

 A

Incineration

 B

Microwaving

 C

Autoclaving

 D

Chemical treatment

Ans. A

Explanation:

Ans. is ‘a’ i.e., Incineration 

o Human anatomical waste (human tissues organs, body parts), e.g. placenta, are disposed by incineration or deep burial.


Q. 7

Animal waste is disposed off by-

 A

Incineration

 B

Autoclave

 C

Microwave

 D

None

Q. 7

Animal waste is disposed off by-

 A

Incineration

 B

Autoclave

 C

Microwave

 D

None

Ans. A

Explanation:

Ans. is ‘a’ i.e., Incineration 

Animal wastes (category 2) are disposed by incineration or Deep burial.


Q. 8

Best for Incineration of infectiouswaste ‑

 A

Double – chamber

 B

Single – chamber

 C

Triple – chamber

 D

None

Q. 8

Best for Incineration of infectiouswaste ‑

 A

Double – chamber

 B

Single – chamber

 C

Triple – chamber

 D

None

Ans. A

Explanation:

Ans. is ‘a’ i.e., Double-chamber 

o Three basic kinds of incineration technology are of interest for treatment of healh care wastes :

i)      Double-chamber pyrolytic incinerators which may be especially designed to burn infectious health care waste.

ii)     Single-chamber furnaces with static grate, which should be used only if pyrolytic incinerators are not affordable.

iii)   Rotary kilns operating at high temperatures, capable of causing decomposition of genotoxic substances and heat-resistant chemicals.


Q. 9

Best way to sterilize all-glass syringes is:

September 2007

 A

Boiling

 B

Autoclave

 C

Hot air oven

 D

Formaldehyde

Q. 9

Best way to sterilize all-glass syringes is:

September 2007

 A

Boiling

 B

Autoclave

 C

Hot air oven

 D

Formaldehyde

Ans. C

Explanation:

Ans. C: Hot air oven

Dry heat can be used to sterilize items, but as the heat takes much longer to be transferred to the organism. The standard setting for a hot air oven is at least two hours at 160 °C (320 °F). It is used to sterilise glassware, forceps, scissors, scalpels, all-glass syringes, swabs, liquid paraffin etc.

A rapid method heats air to 190 °C (374 °F) for 6 minutes for unwrapped objects and 12 minutes for wrapped objects. Dry heat has the advantage that it can be used on powders and other heat-stable items that are adversely affected by steam.


Q. 10

Incineration is done for which of the following:

September 2008

 A

Liquid waste

 B

Anatomy waste

 C

Sharp waste

 D

All of the above

Q. 10

Incineration is done for which of the following:

September 2008

 A

Liquid waste

 B

Anatomy waste

 C

Sharp waste

 D

All of the above

Ans. B

Explanation:

Ans. B: Anatomy waste

Medical waste incinerators (MWIs) burn hospital waste particularly anatomy waste and amputated limbs,animal carcasses.

Liquid waste is treated with disinfectants/reagents and neutralized before flushing into the sewer.

Sharp waste can be disposed by deep burial if land is available


Q. 11

Temperature required for holding period of 20 minutes in Hot air oven –

 A

160° C

 B

170° C

 C

120° C

 D

130° C

Q. 11

Temperature required for holding period of 20 minutes in Hot air oven –

 A

160° C

 B

170° C

 C

120° C

 D

130° C

Ans. B

Explanation:

Ans. is ‘b’ i.e., 170° C


Q. 12

Glassware is sterilized in Hot air oven at

 A

160°C for 1 hour

 B

170°C for 1 hour

 C

180°C for 1 hour

 D

190°C for 1 hour

Q. 12

Glassware is sterilized in Hot air oven at

 A

160°C for 1 hour

 B

170°C for 1 hour

 C

180°C for 1 hour

 D

190°C for 1 hour

Ans. A

Explanation:

Ans. is ‘a’ i.e., 160°C for 1 hour


Q. 13

Hot air oven is used to sterilize ‑

 A

Inoculating loop or wire

 B

Glassware

 C

Dusting powder

 D

Liquid paraffine

Q. 13

Hot air oven is used to sterilize ‑

 A

Inoculating loop or wire

 B

Glassware

 C

Dusting powder

 D

Liquid paraffine

Ans. B

Explanation:

Ans. is ‘b’ i.e., Glassware


Q. 14

Cytotoxic drugs are treated/disposed by ‑

 A

Autoclaving

 B

Chemical disinfection

 C

Incineration

 D

Microwaving

Q. 14

Cytotoxic drugs are treated/disposed by ‑

 A

Autoclaving

 B

Chemical disinfection

 C

Incineration

 D

Microwaving

Ans. C

Explanation:

Ans. is ‘c’ i.e., Incineration

Cytotoxic drugs are category No. 5 wastes which are destroyed by incineration and disposed by secured landfills.


Q. 15

Glass vessels and syringes are best sterilised by –

 A

Hot air oven

 B

Autoclaving

 C

Irradiation

 D

Ethylene dioxide

Q. 15

Glass vessels and syringes are best sterilised by –

 A

Hot air oven

 B

Autoclaving

 C

Irradiation

 D

Ethylene dioxide

Ans. A

Explanation:

Ans. is `a’ i.e., Hot air oven

Hot air oven

  • Hot air oven are electrical devices used in sterilization. 
  • The oven uses dry heat to sterilize articles.

Hot air oven is used for

  • Glass ware             
  • Swabs                      
  • Liquid paraffin   
  • Fat and grease
  • All glass syringe         
  • Forceps, scissors, scalpels      
  • Dusting powder


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