Refrigerators
Xerox machines
Dermatological photo-therapy equipments
High voltage electrical equipments
✅ The correct answer is option A.
Chemical Engineering MCQs
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
5
100
1000
2000
✅ The correct answer is option A.
A standard test for determination of hardness in water is termed as __________ test.
EDTA
Electometric
Total count
Presumptive
✅ The correct answer is option A.
COD of raw municipal sewage may be in the range of about __________ mg/litre.
1-Feb
5-Oct
90-120
1500-2500
✅ The correct answer is option C.
Exposure to chemicals having carcinogenic properties cause
Dermatitis (skin disorder)
Cancer
Asphyxiation
Asthma
✅ The correct answer is option B.
TLV of aldrin in public water supply system is about __________ μg/litre.
0.5
17
357
1097
✅ The correct answer is option B.
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.
0.05
1
6.5
15
✅ The correct answer is option C.
Threshold limit value (TLV) of CO in air is __________ ppm.
5
50
2000
5000
✅ The correct answer is option B.
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
Ionosphere
Troposphere
Stratosphere
None of these
✅ The correct answer is option B.
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m³.(μg-microgram)
10
90
800
750
✅ The correct answer is option B.