Excessive fluoride in drinking water causes Alzheimer's disease Mottling of teet

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Question
Excessive fluoride in drinking water causes
Options
A. Alzheimer's disease
B. Mottling of teeth and embrittlement of bones
C. Methemoglobinemia
D. Skin cancer

Correct Answer

Mottling of teeth and embrittlement of bones

GATE Exam Questions problems

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2. The proposed dam shown in the below figure is 90 m long and coefficient of permeability of the soil is 0.0013 mm/second. The quantity of water (m³) that will be lost per day, by seepage is (rounded to the nearest number):
Options
A. 55
B. 57
C. 59
D. 61

4. The Bowen ratio is defined as :
Options
A. Ratio of heat and vapour diffusivities.
B. Proportionality constant between vapour heat flux and sensible heat flux.
C. Ratio of actual evapotranspiration and potential evapotranspiration.
D. Proportionality constant between heat energy used up in evaporation and the bulk radiation from a water body.

5. For the strip footing on a saturated clay, for the given failure surface as shown in the below figure, the bearing capacity equation takes the form : (where C_u - undrained shear strength ?_u - angle of internal friction B - width of strip footing qc - ultimate bearing capacity of soil)
Options
A. 5.7 C_u
B. 5.14 C_u
C. 4? C_u
D. 2? C_u

6. A 1 : 30 model of an ogee spillway crest records an acceleration of 1.3 m/s² at a certain location. The homologous value of the acceleration in the prototype in m/s² , is
Options
A. 0.043
B. 0.237
C. 1.300
D. 7.120

7. A reinforced concrete wall carrying vertical loads is generally designed as per recommendations given for columns. The ratio of minimum reinforcements in the vertical and horizontal directions is
Options
A. 2 : 1
B. 5 : 3
C. 1 : 1
D. 3 : 5

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