C:-Beryllia bricks
D:-fire clay bricks
Correct Answer:- Option-C
Question39:-A bullet-resistant glass is obtained by:
A:-embedding a wiremesh at the centre of the glass sheet
B:-pressing together several layers of glass with vinyl resins in altemate layers
C:-using two or more plates of glass separated by 6-13mm thick gap containing dehydrated air
D:-none of the above
Correct Answer:- Option-B
Question40:-The single most important property of lubricating oil is its:
A:fire-point
B:-cloud-point
C:-oiliness
D:-viscosity-index
Correct Answer:- Option-D
Question41:-Purest form of Iron ‏:کا‎
‎കടല
‎B:-wrought iron
C:-pig iron
D:-cast iron
Correct Answer:- Option-B
Question42:-Caprolactum is 2 monomer of:
A:-nylon-6
B:-Teflon
C:-PTFE
D:-Melamine
Correct Answer:- Option-A
Questiond3:-The emissivity of a real surface is always :
A:-greater than unity
B:-equal to unity
C:-less than unity
D:-less than or greater than unity
Correct Answer:- Option-C
Question44:-Asphalt is obtained from-------i in a refinery
Ac-residues
B:-intermediate distillates
C:-heavy distillates
D:-light distillates
Correct Answer:- Option-A
Question45:-An example of high explosive is :
A:-gun powder
B:-nitrocellulose
ஙா
D:-lead oxide
Correct Answer:- Option-C
Question4&:-Identification of an organic compound can be established by using:
A:-LV spectroscopy
B:-IR spectroscopy
C:-chromatography
D:-none of the above
Correct Answer:- Option-B
Question47:-Which noise can be tolerated by human லார்‌
A:-20 decibels
B:-100 decibels
C:-80 decibels
D:-120 decibels
Correct Answer:- Option-C
Question48:-A fluid has no viscosity:
A:-real fluid