Class XII

In an atomic nucleus, neutrons and protons are held together by
  1. gravitational forces
  2. exchange forces
  3. coulombic forces
  4. magnetic forces
Which of the following has a least penetrating power?
  1. All have same penetrating power
  2. Beta Particles
  3. Alpha particles
  4. Gamma rays
The dark lines in the solar spectrum are due to
  1. . absorption of corresponding wavelengths by the outer layers of the sun
  2. destructive interference between waves of certain definite wavelengths
  3. . absorption of corresponding wavelengths by the prism used in the photograph
  4. absence of corresponding wavelengths from the light emitted by the core of the sun
Who suggested that most of the mass of the atom is located in the nucleus?
  1. Thompson
  2. Bohr
  3. Rutherford
  4. Einstein
The age of most ancient geological formations is estimated by
  1. . Ra - Si method
  2. Potassium - argon method
  3. . C14 method
  4. Uranium - lead method
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