ATOMIC STRUCTURE
DPP-1
1. Which has the highest e/m ratio :-
a. He+2 b. H+ c. He+1 d. H
2. Mass oof neutron is ………………. Time the mass of electron .
a. 1840 b. 1480 c. 2000 d. None
3. Rutherford’s experiment is related to.
A. Nucleus b. Atom c. Electron d. Neutron
4. Small packets of light is called.
A. proton b. quanta c. photon d. spectrum
5. Which of the following particle is not deflected in the magnetic field .
a. electron b. proton c. neutron d. deuteron
6. E/M ratio of a particle of charge 2 unit and mass 4 amu .
a. 4.8 × 107 c/kg b. 0.5 c/kg c. 4.8 × 104 c/kg d. 8 ×10-20 c/kg
7. The specific charge is maximum for
a. Na+ b. Al+3 c. H+ d. Mg+2
8. Which of the following electromagnetic radiation have greater frequency .
a. X – rays b. ultraviolet rays c. Radio waves d. Visible rays
9. The ratio of energy of a photon of 2000A° wavelength radiation to that of 4000A° radiation is
a. ¼ b.4 c. ½ d. 2
10. Two electromagnetic radiations have wave numbers in the ratio 2:3 . Their energies per quanta
will be in the ratio
a. 2:3 b. 9:4 c. 4:9 d. 3:2
11. A radio station is emitting the radiations of frequency 2 × 104 Hz . If its frequency is doubled .
a. wavelength will be doubled
b. energy per quanta will be doubled
c. wave number will be doubled
d. all of these
12. Bohr’s model may be applied to
a. Na10+ion b. He atom c. Be+2 ion d. C+6 ion
13. If the radius of 3rd Bohr orbit of hydrogen is X , then the radius of 4th orbit of Li+2 ion will be
a. 27/16 x b. 16/27 x c. 9/16 d. none of these
14 . If the mass of electron is doubled , the radius of first orbit of hydrogen atom become about .
a. 0.529A° b. 0.265A° c. 1.058A° d. 0.32A°
