| 1 |
Paschen series lies in the |
- A. Far ultraviolet region
- B. Visible region
- C. Ultraviolet region
- D. Inferred region
|
| 2 |
Balmer series lies in region of electromagnetic spectrum. |
- A. Infrared
- B. Visible
- C. Ultraviolet
- D. Fra infrared
|
| 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 |
If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be |
- A. 136.0 volt
- B. 3.0 volt
- C. 13.6 volt
- D. None of these
|
| 5 |
In according with Bohr's theory the K.E of the electron is equal to: |
- A. ke<sup>2</sup>/2r
- B. Ze<sup>2</sup>/r
- C. Ze<sup>2</sup>/r<sup>2</sup>
- D. Ze<sup>2</sup>/2r<sup>2</sup>
|
| 6 |
Photons emitted in inner shell transition are. |
- A. Continuous X -rays
- B. Discontinuous X rays
- C. Characteristic X rays
- D. Energetic X rays
|
| 7 |
First spectral series of hydrogen atom was discovered by |
- A. Lyman
- B. Rydberg
- C. Balmer
- D. Paschen
|
| 8 |
Laser is a beam of light which is |
- A. Monochromatic
- B. Coherent
- C. Unidirectional
- D. All of these
|
| 9 |
The radius of 10th orbit in hydrogen atom is. |
- A. 0.053 nm
- B. 0.53 nm
- C. 5.3 nm
- D. 53 nm
|
| 10 |
Helium Neon Laser Beam emitted from discharge tube has a colour. |
- A. Blue
- B. Green
- C. Red
- D. Black
|
