Everyday ScienceInventions, Discoveries and Explorations
The existence of isotopes was discovered by:
Faraday
Johan August Arfwedson
Frederick Soddy
Peter Armbruster
Frederick Soddy
The existence of isotopes was first suggested in 1913 byย the radiochemist Frederick Soddy, based on studies of radioactive decay chains that indicated about 40 different species referred to as radioelements (i.e. radioactive elements) between uranium and lead.
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Vitamin C is soluble inA. fat
B. water
C. ethers
D. phenols
Who invented bifocal lenses for glasses?
A. Alfred B. Nobel
B. Thomas Alva Edison
C. Benjamin Franklin
D. Rudolf Diesel
The density of air in the atmosphere is
A. uniform
B. not uniform
C. zero
D. none of above
In the body, the weight of blood is about
A. 1/12th of body
B. 1/5th of body
C. 1/8th of body
D. 1/4th of body
Which substance is present in fuel?
A. Iron
B. Gold
C. Carbon
D. Copper
The energy stored in coal is
A. kinetic energy
B. potential energy
C. chemical energy
D. nuclear energy
A human breath per minute is
A. 16-30 times
B. 16-20 times
C. 15-20 times
D. 15-18 times
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