TNPSC Physics Study Material in English
| 5. |
The coefficient of reflectivity of a perfect black body is |
| |
- A. Infinite
- B. Zero
- C. One
- D. Between zero and one
|
| 6. |
The term "Mach" is used to measure speed of |
| |
- A. Sound
- B. Wind
- C. Ship
- D. Aeroplane
|
| 7. |
Printing for the blind was introduced by |
| |
- A. Lousis Braille
- B. Michael faraday
- C. Harvey
- D. Carton
|
| 8. |
The amount of actual watervapour per unit volume of air is known as its |
| |
- A. Dew point
- B. Absolute humidity
- C. Relative humidity
- D. Condensation point
|
