Physics-Objective Related Question Answers
326. Frequency of audible sound is?
20Hz to 20; 000 Hz
327. The machine used to reproduce sound?
Phonogram
328. The method of locating under water objects using sound waves?
SONAR (Sound Navigation and Ranging)
329. Waves used in SONAR are?
Ultrasonic waves
330. The phenomena of sound which is used in stethoscope?
Reflection of sound
331. The unit which is usually used to denote the intensity of pollution?
Parts per million (ppm)
332. Normal sound level in decibel?
60-120 db
333. The intensity of sound felt by the ear?
Loudness
334. The shrillness of sound felt by the ear is?
Pitch
335. Used to denote the speed of a supersonic plane?
Mach Number
336. 1 Mach number is equal to?
340 m/s
337. Persistence of sound?
1/10 seconds
338. Ultrasound scanning uses high frequency?
Ultrasonic waves
339. Echo and reverberation are due to the reflection of?
Sound
340. Minimum distance required for the production of echo?
17 meter
341. Phenomenon utilized by bats to detect prey and obstacles in their path in night?
Echolocation
342. For echolocation bats use?
Ultrasonic sound
343. Depth of the sea is measured in?
Fathom
344. 1 fathom =…?
6 feet = 1.82 m
345. It is an indication of object's internal energy or it is the degree of hotness/ coldness?
Temperature
346. Heat is measured in the unit of?
Joule (J)
347. The study of materials and phenomena at low temperature?
Cryogenics
348. The temperature scale not having Negative temperature is?
Kelvin scale
349. The amount of heat required to raise the temperature of 19m of water by 1°C?
One calorie
350. The instrument used for measuring high temperature?
Pyrometer
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