The age of most ancient geological formations is estimated by
A). Ra - Si method
B). Potassium - argon method
C). C14 method
D). Uranium - lead method
The isotope of uranium capable of sustaining chain reaction is
A). U-235
B). U-245
C). U-239
D). U-238
Which of the following has a least penetrating power?
A). All have same penetrating power
B). Beta Particles
C). Alpha particles
D). Gamma rays
What is the wavelength of visible spectrum?
A). 8500 - 9800 angstrom
B). 7800 - 8000 angstrom
C). 3900 - 7600 angstrom
D). 1300 - 3000 angstrom
Which of the following shows the masses of the three elementary particles in decreasing order?
A). Leptons, Baryons, Mesons
B). Mesons, Baryons, Leptons
C). Baryons, Mesons, Leptons
D). Leptons, Mesons Baryons