Class XI

In ββ-decay, the nucleus emits.
  1. a proton and a charged particle called neutrino
  2. an electron and a charged particle called neutrino
  3. a proton and a charged particle called anti neutrino
  4. an electron and an uncharged particle called neutrin
The major contribution of Paul Dirac was in
  1. Measurement of electronic charge
  2. photoelectric effect
  3. Relativistic theory of electron
  4. relativity theory
in every conservation principle
  1. a physical quantity like energy is converted into mass
  2. a physical quantity for example total momentum does not change in a phenomenon. The quantity has the same value before and after the phenomenon.
  3. a physical quantity like mass is converted into energy
  4. a physical quantity changes to a form of energy
Among the various allotropes of carbon,
  1. coke is the hardest, graphite is the softest
  2. diamond is the hardest, coke is the softest
  3. diamond is the hardest, graphite is the softest
  4. diamond is the hardest, lamp black is the softest
Which of the following is used in pencils?
  1. Graphite
  2. Silicon
  3. Charcoal
  4. Phosphorous
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