| 1 |
The radius of hydrogen atom is: |
- A. 0.53A°
- B. 0.053A°
- C. 0.53 x 10<sup>-9</sup>
- D. 0.053 x10<sup>-9</sup>
|
| 2 |
The 1<sup>st</sup> Bohr atom in the hydrogen atom has radius |
- A. 3.56 x 10<sup>-10</sup> m
- B. 0.053 x 10<sup>-11</sup> m
- C. 0.53 x 10<sup>-11</sup> m
- D. 5.30 x 10<sup>-11</sup> m
|
| 3 |
Earth orbital speed is |
- A. 10 km/s
- B. 20 km/s
- C. 30 km/s
- D. 40 km/s
|
| 4 |
When an electron in an atom goes from a lower to higher orbit its: |
- A. K.E increases , P.E decreases
- B. K.E increases , P.E increases
- C. K.E decreases , P.E increases
- D. K.E decreases , P.E decreases
|
| 5 |
Boher proposed his atomic model in: |
- A. 1910
- B. 1911
- C. 1912
- D. 1913
|
| 6 |
The unit of Rh is. |
- A. ms-1
- B. m
- C. m<sup>2</sup>
- D. m<sup>-1</sup>
|
| 7 |
In Helium Neon laser, discharge tube is filled with Neon gas. |
- A. 10%
- B. 15%
- C. 85%
- D. 90%
|
| 8 |
_____ has the largest de Broglie wavelength at same speed. |
- A. Proton
- B. Alpha particle
- C. Carbon atom
- D. Electron
|
| 9 |
Laser is a device which can produce: |
- A. Intense beam of light
- B. Coherant beam of light
- C. Monochromatic beam of light
- D. All of the above
|
| 10 |
First spectral series of hydrogen atom was discovered by |
- A. Lyman
- B. Rydberg
- C. Balmer
- D. Paschen
|
