| 1 |
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
|
| 2 |
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
|
| 3 |
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
|
| 4 |
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>
|
| 5 |
The series in infrared region is: |
- A. Paschen series
- B. Bracket series
- C. Pfund series
- D. All of above
|
| 6 |
Electron volt is unit of: |
- A. Chemical energy
- B. Potential energy
- C. Nuclear energy
- D. heat energy
|
| 7 |
In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to: |
- A. Infinite energy
- B. Maximum energy
- C. Minimum energy
- D. Zero energy
|
| 8 |
1 rad = |
- A. 0.001Gy
- B. 0.01Gy
- C. 0.1Gy
- D. 1.01Gy
|
| 9 |
For Holography we use |
- A. X ray
- B. Laser
- C. gama rays
- D. Beta rays
|
| 10 |
Which of the following is one of the spectral series of atomic hydrogen? |
- A. Brockett series
- B. Balmer series
- C. P fund series
- D. All of above
|
