E-PolyLearning

31. Spectrum has
a. three types
b. two types
c. five types
d. seven types
View Answer Report Discuss 50-50!
Answer: (b).two types

32. Heisenberg gave his concept in
a. 1923
b. 1927
c. 1980
d. 1990
View Answer Report Discuss 50-50!
Answer: (b).1927

33. When electron is brought from infinity to radius r its energy
a. increases
b. decreases
c. remains same
d. reflects
View Answer Report Discuss 50-50!
Answer: (b).decreases

34. New element formed by reaction of alpha particles with Beryllium is
a. nitrogen
b. hydrogen
c. carbon
d. zinc
View Answer Report Discuss 50-50!
Answer: (c).carbon

35. Pressure range which is applied in discharge tube is
a. 9000-10000
b. 7000-9000
c. 4000-5000
d. 5000-10000
View Answer Report Discuss 50-50!
Answer: (d).5000-10000