| 1 |
The charge on electron was determined by millikan in his oil drop experiment and its value is |
- A. 6.023 x 10<sup>-23</sup>C
- B. 1.602 x 10<sup>-23</sup>C
- C. 1.602 x 10<sup>-19</sup>C
- D. 6.625 x 10<sup>-34</sup>C
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| 2 |
Which particle has a mass 1/1836 time, that of hydrogen. |
- A. Proton
- B. Positron
- C. Electron
- D. Neutron
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| 3 |
The electron in a subshell is filled according to formula. |
- A. 2n<sup>2</sup>
- B. 2(2l+1)
- C. (2l+1)
- D. None of these
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| 4 |
Which one of the following orbital will be filled first. |
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| 5 |
Which particle have greater wave nature. |
- A. Electron
- B. Proton
- C. Neutron
- D. a particles
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| 6 |
The wave number of the light emitted by a certain source is 2 x 10<sup>6</sup> m-1 . The wavelength of this light will be. |
- A. 500 nm
- B. 5000 nm
- C. 200 nm
- D. 5 x10<sup>7</sup> m
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| 7 |
When atoms are subjected to strong electric field, splitting of spectral lines is called. |
- A. Zeeman effect
- B. stark effect
- C. Photoelectric effect
- D. Compton effect
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| 8 |
If uncertainty in position of electron is zero, the uncertainty in its momentum would be. |
- A. zero
- B. Less than zero
- C. Infinite
- D. One
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| 9 |
If the electron in a hydrogen atom drops from n = 6 to n =4 level, the radiation emitted is in which series of lines in the spectrum of atomic hydrogen. |
- A. Lyman
- B. Balmer
- C. Paschen
- D. Brackett
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| 10 |
Bohr's model of atom, is contradicted by. |
- A. Planck quantum theory
- B. Pauli's exclusion prinsciple
- C. Heisenberg's uncertainty principle
- D. All of the above
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