Class XII

Electric charges are of
  1. 2 types
  2. 5 types
  3. 3 types
  4. 4 types
Ionization of a neutral atom is the
  1. only gain of one or more electrons
  2. gain or loss of one or more electrons
  3. only gain of one or more protons
  4. only gain of one or more neutrons
According to superposition of electric fields
  1. The electric field of any combination of charges is the vector sum of the fields caused by the individual charges.
  2. The electric field of any combination of charges is the cross product of the individual fields
  3. The electric field of any combination of charges is the vector sum of the individual charges
  4. The electric field of any combination of charges is the scalar sum of the fields caused by the individual charges.
In charging by Induction
  1. a metallic object is charged by rubbing it with silk
  2. a metallic object by touching touching with a charged object
  3. a metallic object is charged by rubbing it with fur
  4. a metallic object is charged by bringing a charged object near it
A conducting sphere of radius 5 cm is charged to 15 μμ C. Another uncharged sphere of radius 10 cm is allowed to touch it for enough time. After the two are separated, the surface density of charge on the two spheres will be in the ratio
  1. 1:2
  2. 2:1
  3. 1:1
  4. 3:1
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