Class IX

Who laid the foundation of laws of Chemical Combination:
  1. Proust
  2. Dalton
  3. Lavoisier
  4. Democritus
1 u or 1 amu means
  1. Mass of O-16 atom
  2. Mass of C-12 atom
  3. 1/12th mass of C-12 atoms
  4. Mass of Hydrogen molecule
Which one of the following will have the maximum charge/mass ratio?
  1. Proton
  2. Neutron
  3. Electron
  4. α-particle
Name the Indian Philospher who "the smallest indivisible particles of matter" as Parmanu
  1. Aryabhatt
  2. Democritus
  3. Maharishi Kanad
  4. Pakudha Katyayama
If Z represents the atomic number and A represents mass number, then the number of electrons in an atom can be computed as
  1. Z
  2. Z-A
  3. A-Z
  4. A+Z
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