Class XI

Lines in the hydrogen spectrum which appear in the ultraviolet region of the electromagnetic spectrum, then they are called as
  1. Lyman series
  2. Pfund series
  3. Balmer series
  4. Bracket series
The product of the uncertainties of the exact position and exact momentum (or velocity) of an electron. The product of their uncertainties is always
  1. equal to or greater than h/4π.
  2. equal to or greater than h/2π
  3. equal to or greater than h/ π
  4. equal to or greater than h/3π
Values of e/m (charge/mass) in the categories alpha particle (α), electron (e) and protons (p) increase in the order:
  1. a < p < e
  2. e < α < p
  3. p < e < α
  4. α < e < p
Maximum number of electrons in a subshell with l = 3 and n = 4 is
  1. 14
  2. 16
  3. 32
  4. 12
Values of e/m (charge/mass) in the categories alpha particle (α), electron (e) and protons (p) increase in the order:
  1. a < p < e
  2. e < α < p
  3. p < e < α
  4. α < e < p
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