231: What is the pH level of blood of normal person?
(a) 4.5-4.5
(b) 6.45-6.55
(c) 7.35-7.45
(d) 8.25-8.35
Explanation:
Regulation of body pH (the normal pH of blood is in the range of 7.35 - 7.45). Blood that has a pH below 7.35 is too acidic, while blood pH above 7.45 is too alkaline. Blood pH, partial pressure of oxygen (PaO), partial pressure of carbon dioxide(paCOz) and HC03 are carefully regulated by a number of homeostatic mechanisms, which principally exert their influence through influence the respiratory system and the urinary system in the control the acid-base balance and respiration. Plasma also circulates hormones transmitting their messages to various tissues.
232: Physico-chemical characteristics of water in water sources undergo changes due to
(a) aquatic macrophytes
(b) aquatic fungi
(c) effluents
(d) evapotranspiration
233: In which of the following areas can GPS technology be used?
1. Mobile phone operations
2. Banking operations
3. Controlling the power grids
Select the correct answer using the code given below:
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
234: The heater element in an electric iron is made of:
(a) Nichrome
(b) Tungsten
(c) Copper
(d) Iron
235: Consider the following statements about probiotic food :
1. Probiotic food contains live bacteria which are considered beneficial to humans.
2. Probiotic food helps in maintaining gut flora.
(a) 1 only
(b) 2 Only
(c) Both 1 and 2
(d) Neither 1 nor 2