General Science – Exercise – 3

121. 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

122. The isotope of uranium capable of sustaining chain reaction is

(a) U-235
(b) U-245
(c) U-239
(d) U-238

123. Which of the following has a least penetrating power?

(a) All have same penetrating power
(b) Beta Particles
(c) Alpha particles
(d) Gamma rays

124. Which of the following rays are more penetrating?

(a) Beta rays
(b) Alpha rays
(c) Gamma rays
(d) X-rays

125. Who suggested that most of the mass of the atom is located in the nucleus?

(a) Thompson
(b) Bohr
(c) Rutherford
(d) Einstein

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