Related Questions

There are 87 balls in a jar. Each ball is painted with at least one of two colors, red or green. It is observed that 2/7 of the balls that have red color also have green color, while 3/7 of the balls that have green color also have red color. what fraction of the balls in the jar has both red and green colors?
A 6/14
B 2/7
C 6/35
D 6/29
Maximum permissible turbidity in potable water is __________ ppm.
A 1
B 10
C 250
D 1000
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
A 0.002
B 0.2
C 1.2
D 4.8
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
A 1
B 5
C 50
D 500
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
A [

A.

B. 10-100

B 100-200
C 100-1000
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
A 1000 to 2000
B 3000 to 6000
C 6000 to 9000
D 10000 to 100000
শাকিলের প্রস্তুতকৃত দ্রবণের i. ppm একক হবে 40000 ppm ii. মধ্যে আরো 10 mL পানিযোগে সেমিমোেলারে পরিণত হবে iii. মধ্যে 6.02 × 1022 টি NaOH অণু রয়েছে নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
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
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.
A 2
B 42
C 332
D 1050
Fresh domestic sewage is __________ in color.
A Grey
B Dark brown
C Red
D Black

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