| 1 |
Bremsstrahlung radiation are examples of |
- A. Atomic spectra
- B. Molecular spectra
- C. Continuous spectra
- D. Discrete spectra
|
| 2 |
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>
|
| 3 |
An atom can reside in excited state for |
- A. 10<sup>-8</sup> second
- B. One second
- C. 10<sup>-10</sup> second
- D. More than one second
|
| 4 |
In Helium Neon laser, discharge tube is filled with Neon gas. |
- A. 10%
- B. 15%
- C. 85%
- D. 90%
|
| 5 |
The following gas was identified in the sun using spectroscopy |
- A. Hydrogen
- B. Helium
- C. Carbon
- D. Nitrogen
|
| 6 |
If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of. |
- A. 3.40 eV
- B. 10.20 eV
- C. 13.6 eV
- D. 3.8 eV
|
| 7 |
Earth orbital speed is |
- A. 10 km/s
- B. 20 km/s
- C. 30 km/s
- D. 40 km/s
|
| 8 |
Which of the following series of hydrogen spectrum lies in ultra violet region. |
- A. Lyman sereis
- B. Paschen series
- C. Balmar series
- D. Bracket series
|
| 9 |
The value of Rydberg constant is: |
- A. 1.0749x10<sup>7</sup>m<sup>-1</sup>
- B. 1.0974 x 10<sup>7</sup> m<sup>-1</sup>
- C. 1.974 x10<sup>6</sup>m<sup>-1</sup>
- D. 1.0974 x 10<sup>-7</sup> m<sup>-1</sup>
|
| 10 |
Balmer series lies in |
- A. Visible region
- B. Invisible region
- C. Ultraviolet region
- D. Infrared region
|
