| 1 |
Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is. |
- A. X rays
- B. Gama rays
- C. Heat Radiation
- D. Ultraviolet rays
|
| 2 |
When platinum is it becomes orange at. |
- A. 500<sup>o</sup>C
- B. 900<sup>o</sup>C
- C. 1100<sup>o</sup>C
- D. 1300<sup>o</sup>C
|
| 3 |
The energy of the photon of wavelength 500 nm is. |
- A. 3.10 eV
- B. 2.49 eV
- C. 1.77 eV
- D. 1.52 eV
|
| 4 |
The maximum kinetic energy of emitted photo electrons depends upon. |
- A. The intensity of incident light
- B. Frequency of the incident light
- C. Metal surface
- D. Both frequency of incident light and metal surface.
|
| 5 |
When platinum is it becomes orange at |
- A. 500<sup>o</sup>C
- B. 900<sup>o</sup>C
- C. 1100<sup>o</sup>C
- D. 1300<sup>o</sup>C
|
| 6 |
The quantity/factor h/m<sub>o</sub>c has the dimensions of. |
- A. Length
- B. Time
- C. Mass
- D. Energy
|
| 7 |
Which one of the following paved the way for modern physics |
- A. Newtonian mechanics
- B. Theory of relativity
- C. Quantum theory
- D. All of above
|
| 8 |
When platinum wire is heated, it changes to cherry red at temperature. |
- A. 500<sup>o</sup>C
- B. 900<sup>o</sup>C
- C. 1100<sup>o</sup>C
- D. 1300<sup>o</sup>C
|
| 9 |
De-Broglie waves are associated with |
- A. Moving charged particles only
- B. Moving neutral particles only
- C. All moving particles
- D. All parties whether in motion or at rest
|
| 10 |
unit of Plank's constant is same as that of. |
- A. Acceleration
- B. Angular momentum
- C. Linear momentum
- D. Entropy
|
