Related Questions

The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
A 0.01 to 0.05 ppm
B 0.05 to 0.5 ppm
C 0.5 to 1.0 ppm
D 1.0 to 5.0 ppm
Maximum permissible residual chlorine in treated water should be __________ mg/litre.
A 0.001 to 0.01
B 02 to 0.3
C 2 to 3
D 5 to 10
A company owns some land and buildings for which the following details are relevant : Cost of land Taka 50,000; cost of building Taka 100,000, estimated life of building 20 years, estimated residual value of building Taka 2000; estimated residual value of land Taka 50,000. The company uses the straight line depreciation method. Which is the correct annual depreciation charge for this asset?
A Taka 4000
B Taka 4900
C Taka 7400
D Taka 7500
Dose of chlorine for disinfection of water is about __________ mg/litre of water.
A 0.01
B 0.1
C 0.3
D 1
The amount of chlorine available in water after disinfection is called as
A Free chlorine
B Residual chlorine
C Free available chlorine
D Combined available chlorine
Chlorine demand of water is equal to
A Applied chlorine
B Residual chlorine
C Sum of applied and residual chlorine
D Difference of applied and residual chlorine
Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.
A 0.5 to 1
B 10 to 15
C 300 to 500
D 1000 to 1500
Water এর chlorine demand হল- 
A applied chlorine
B residual chlorine
C sum of applied and residual chlorine
D difference applied and residual chlorine
The residual volume is
A The gas remaining in the lungs at the end of forceful expiration
B Greater in COPD than in normal person
C About 1200 ml in young adults
D Measured directly by using a spirometer
E Smaller in the old than in the young
Which one of the following phrases best describes residual magnetism?
A Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
B The force of attraction between the poles of a permanent and temporary magnetic field
C The amount of magnetic flux that is not confined to the core material of an electromagnet
D The circular magnetic field that surrounds a conductor carrying a current
E None of the above

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