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811. The following are some great discoveries in Physics : 1. X-rays 2. Theory of relativity 3. Super conductivity 4. Raman effectThe chronological order in which they were discovered is
A. 1, 2, 3, 4
B. 1, 2, 4, 3
C. 1, 3, 2, 4
D. 4, 1, 2, 3
Explanation:
812. Acid rain can cause
A. destruction of crops and trees
B. destruction of fish
C. damage to buildings
D. All the above
Explanation:
813. A mixture of iron filings and sand can be separted by
A. Heating
B. Sublimation
C. Hand picking
D. Magnetic separation
Explanation:
814. The species to which we belong is
A. Homo sapiens
B. Homo erectus
C. Australopithecus robuctus
D. None of these
Explanation:
815. Consider the following statements : 1. Banking soda is used in fire extinguishers 2. Quicklime is used in the manufacture of glass3. Gypsum is used in the manufacture of Plaster of ParisWhich of the statements given above is/are correct ?
A. 1 and 2
B. 2 and 3
C. 1 only
D. 1, 2 and 3
Explanation:
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