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Physics 10th Class English Medium Unit 2 Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | The speed of sound was accurately measured in: | 1736 1737 1738 1739 |
| 2 | When frequency of sound wave is increased, which of the following decreases? i) Wavelength ii) Period iii) Amplitude |
i only (iii) only i and ii only i and iii only |
| 3 | For normal person audible frequency range for sound wave lies between. | 10 Hz and 10KHz 20 Hz and 20KHz 25 Hz and 25KHz 30 Hz and 30KHz |
| 4 | The loudness of sound is most closely related to its: | Freqeucy Period Wavelength Amplitude |
| 5 | Astronauts is space need to communicate with each other by radio links because: | Sound waves travel very slowly in space. Sound waves travel very fast in speace Sound waves cannot travel in space Sound waves have low frequency in space |
| 6 | Which form of energy is sound? | Electrical Mechanical Thermal Chemical |
| 7 | How does sound travel from its source to your ear? | Byc changes in air pressure By vibration in wires or strings By electromagnetic waves By infrared waves |
| 8 | Which is an example of a longitudinal wave? | Sound wave Light wave Radio wave Water wave |
| 9 | The speed of sound in the air at one atmospheric pressure at room temperature is: | 343 ms-1 346 ms-1 349 ms-1 339 ms-1 |
| 10 | To hear echo, the distance between the observer and the obstacle is 17m then how much distance will the sound travel? | 60m 54m 17m 34m |
| 11 | After how much time the echo must be heard? | 0.1 s 0.10 s 0.20 s 0.50 s |
| 12 | Mathematical formula of sound level (in bel) is: | S.L = 10 log I/Io (bel) S.L = K log I/Io (bel) S.L = Log I/Io (bel) S.L = 10 log Io/I (bel) |
