The radio-active element used in heart pacemakers is:
A. Uranium
B. Deuterium
C. Plutonium
D. Radium
Where does the oxygen that keeps us alive come from?
A. Carbon dioxide
B. Carbonates absorbed from soil
C. Oxides of minerals
D. Water
Soap is prepared by boiling caustic soda with:
A. Alcohol
B. Kerosene oil
C. Glycerine
D. Fats
Who discovered carbohydrates fats and proteins?
A. William Prout
B. Jons Jacob Berzelius
C. Anselme Payen
D. Walter Bradford Cannon
Hookworm is a parasitic worm that infects:
A. large intestine
B. liver
C. lungs
D. small intestine
Nitrate (NO3) ions are obtained by the process of:
A. Nitrification
B. Fermentation
C. Denitrification
D. None of these
Which one of the following results in the discovery of proton.
A. Cathode rays
B. Canal rays
C. X-rays
D. Alpha rays
The radiations with negative charge are:
A. Alpha radiations
B. Gamma radiations
C. Beta radiations
D. positron
The radiations with highest speed are:
A. Alpha radiations
B. Gamma radiations
C. Beta radiations
D. AOT
Petra means:
A. Petrol
B. Sediment
C. Rock
D. Fuel
