Class X

Simplest atom with single proton is of
  1. Carbon
  2. Helium
  3. Nitrogen
  4. Hydrogen
The phenomenon by which radiations split matter into negative and positive ions is called
  1. Ionization
  2. Radiation
  3. Radioactivity
  4. Transmutation
Radiations present in atmosphere due to different radioactive substances are called
  1. Cosmic radiations
  2. Positive radiations
  3. Background radiations
  4. Environmental radiations
Isotopes have same number of protons but different number of
  1. Shells
  2. Neutrons
  3. Electrons
  4. Positrons
Alpha (α) particles are helium (He) nucleus with a charge of
  1. e
  2. 2e
  3. 3e
  4. 4e
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