| 1 |
The value of a time period of allow flying satellite is |
- A. 1 year
- B. 84 minutes
- C. 28 hours
- D. 1 day
|
| 2 |
Michelson's interferometer can be used ot find the |
- A. Velocity of light
- B. Wavelength of light
- C. Velocity of sound
- D. Wavelength of sound
|
| 3 |
Speed of sound in copper is |
- A. 38000 ms-1
- B. 3600 ms-1
- C. 3500 ms-1
- D. 3400 ms-1
|
| 4 |
If heat is added to a system, then its entropy will. |
- A. Increases and positive
- B. Decrease and positive
- C. Increases but negative
- D. Decreases but negative
|
| 5 |
When temperature of source and sink of a heat engine becomes equal then the entropy change will be. |
- A. zero
- B. Minimum
- C. Maximum
- D. Negative
|
| 6 |
An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at. |
- A. 0 K
- B. 0 <sup>o</sup>C
- C. 100 K
- D. 100 <sup>o</sup>C
|
| 7 |
The profile of periodic waves generated by a source executing S.H.M is represented by a. |
- A. Circle
- B. Sine curve
- C. Tangent curve
- D. Cosine curve
|
| 8 |
Teh speed of sound in air is 340 m/s. If the pressure of air is doubled then the speed becomes. |
- A. Double
- B. Half
- C. Four times
- D. Remains same
|
| 9 |
Radar system is an application of. |
- A. Chemical effect
- B. Electric effect
- C. Magnetic effect
- D. Doppler's effect
|
| 10 |
The least distance of distinct vision for the normal eye is. |
- A. 15 cm
- B. 25 cm
- C. 125 cm
- D. 25 m
|
