Correct Answer:- Option-D
Question19:-The calorific value of a fuel is expressed as :
കിടി
B:-kcal cm=
C:-kcal m=2
பவ
Correct Answer:- Option-C
Question20:-The process of vulcanisation makes rubber :
A:-soluble in water
B:-hard
C:-soft
D:-more elastic
Correct Answer:- Option-B
Question21:-Bakelite is manufactured by heating together :
A:-phenol and formaldehyde
B:-vinyl chloride and benzene
C:-phenol and acetone
D:-phenol and oxalic acid
Correct Answer:- Option-A
Question22:-A plastic which can be softened on heating hardened on cooling is called :
A:-thermoelastic
B:-thermoplastic
C:-thermosetting
D:-thermite
Correct Answer:- Option-B
Question23:-Desalination is a process of removing :

C:-common salt
D:-hardness from water
Correct Answer:- Option-C
Question24:-Most popular and ideal disinfectant in water works is :
A:-bleaching powder
B:-ozone
C:-chlorine
D:-lime
Correct Answer:- Option-C
Question25:-Standard atmospheric pressure in terms of water column is :
A:-9.81m
B:-10.33m
C:-8.75m
D:-12.35m
Correct Answer:- Option-B
Question26:-Electrolytic conduction is due to:
A:-movement of the electrolyte through the external wire
B:-flow of electrons through the solution
C:-migration of ions to the oppositely charged electrodes
D:-flow of positive ions through the extemal wire
Correct Answer:- Option-C
Question27:-A galvenic cell converts :
A:-electrical energy into chemical energy
to electrical energy
0 heat energy
D:-chemical energy into heat energy
Correct Answer:- Option-B
Question28:-Select a suitable adsorbent for the removal of phenolic contaminants from waste water
A:-active carbon
B:-silica gel
C:-molecular sieve