Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?

Related Mcqs:

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. < 1 B. 10-100 C. 100-200 D. 100-1000...

Pick out the wrong statement?

A. Biological oxygen demand (BOD) is a characteristic and not a constituent of water B. BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organism C. BOD is … Pick out the wrong statement?Read More...

Green house effect is accentuated by________________?

A. Deforestation B. Rapid industrialisation C. Increased transportation activity D. All A., B. and C....

Color test of water is done with an instrument called__________________?

A. Tintometer B. Colorimeter C. Electro-chemical cell D. Turbidimeter...

Pick out the wrong statement ?

A. Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value B. Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines C. Temperature in stratosphere rises with increasing altitude D. The characteristic of a green … Pick out the wrong statement ?Read More...