| 1 |
Black Body radiation spectrum is an example of: |
- A. Atomic spectra
- B. Line spectra
- C. Continuous spectra
- D. None of above
|
| 2 |
The following gas was identified in the sun using spectroscopy |
- A. Hydrogen
- B. Helium
- C. Carbon
- D. Nitrogen
|
| 3 |
The velocity of electron moving is 1st orbit of hydrogen atom is: |
- A. 2.09 x 10<sup>6</sup> ms<sup>-1 </sup>
- B. 2.18 x10<sup>6</sup> ms<sup>-1</sup>
- C. 2.19 x 10<sup>6</sup> ms<sup>-1</sup>
- D. 3.18 x10<sup>6</sup> ms<sup>-1</sup>
|
| 4 |
Target material used in x-rays tube have following properties. |
- A. High atomic number and high melting pouint
- B. High atomic number and low melting pouint
- C. Low atomic number and low melting pouint
- D. High atomic number only
|
| 5 |
In an electronic transition atom cannot emit.<div></div> |
- A. Infrared radiations
- B. Visible radiations
- C. Ultraviolet radiations
- D. Gama radiations
|
| 6 |
The typical nuclei are less than: |
- A. 10<sup>-16</sup>m
- B. 10<sup>-14</sup>m
- C. 10<sup>-12</sup>m
- D. 10<sup>-10</sup>m
|
| 7 |
Helium Neon Laser Beam emitted from discharge tube has a colour. |
- A. Blue
- B. Green
- C. Red
- D. Black
|
| 8 |
The value of Rydberg constant is |
- A. 1.0974 x 10<sup>7</sup> m<sup>-1</sup>
- B. 1.0974 x 10<sup>-7</sup> m<sup>-1</sup>
- C. 1.0974 x 10<sup>6</sup> m<sup>-1</sup>
- D. 1.0974 x 10<sup>-6</sup> m<sup>-1</sup>
|
| 9 |
The Balmer series is obtained when all the transition of electrons terminate on |
- A. 1<sup>st</sup> orbit
- B. 2nd orbit
- C. 3rd orbit
- D. 4th orbit
|
| 10 |
In Helium Neon laser, discharge tube is filled with Neon gas. |
- A. 10%
- B. 15%
- C. 85%
- D. 90%
|
