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1216. An atom of an element with mass number 23 and atomic number 11 will have :
A. 11 neutrons, 12 protons and 11 electrons
B. 11 protons, 12 neutrons and 11 electrons
C. 11 neutrons, 11 protons and 12 electrons
D. 23 protons and 11 electrons
Explanation:
1217. Which of the following diseases is most likely to be developed by a worker engaged in cutting and grinding of stones for several years ?
A. Cretinism
B. Asbestosis
C. Botulism
D. Silicosis
Explanation:
1218. Water is a compound because :
A. it exists as a solid, a liquid or a gas
B. it contains hydrogen and oxygen
C. it contains two different elements joined by chemical bonds
D. it cannot be split up into simpler substances by chemical means
Explanation:
1219. In which of the following processes light energy is converted into chemical energy ?
A. Respiration
B. Fermentation
C. Photosynthesis
D. Photorespiration
Explanation:
1220. Radioactive distintegration of uranium ultimately results in formation of :
A. radium
B. thorium
C. polonium
D. lead
Explanation:
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