1. Who was the first person to see a cell under microscope?
Ans: Robert Hooke.
2.Who propounded the theory of relativity?
Ans: Albert Einstein.
3. Who is known as the father of modern Biology?
Ans: Aristotle.
4. The principal metal used in manufacturing steel is ----
Ans: Iron.
5.Who invented Microscope?
Ans: Aaton Van Leewen Hock.
6.An alimeter is used for measuring ----
Ans: Altitude.
7.Galileo's first scientific discovery was ----
Ans: Pendulum.
8. Oology is the study of ----
Ans: Birds eggs.
9. Cresograph is used to measure the -----
Ans: Rate of growth of a plant.
10.Radioactivity was discovered by ----
Ans: Henry Bacquerel.
11. Who propounded the law of gravitation?
Ans: Sir Isaac Newton.
12. The metal used in storage batteries is ---
Ans: Lead.
13. Who invented the nuclear reactor?
Ans: Enrico Ferni.
14.The instrument used to measure the relative humidity of air is
Ans: Hygrometer.
15. Who invented Dynamo?
Ans: Michael Faraday.
16.Who invented Barometer?
Ans:Torricelli.
17. The existence of isotopes was discovered by
Ans: Frederick Soddy.
19.What is the unit of power?
Ans: Watt.
20. Who discovered Radium?
Ans: Marie and Pierrie Curie.
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