SSC JE 2018 || General Science || Important for All Branches || Physics Questions Capsule || Part 3

Scientific Instruments-

Which instrument is used to measure altitudes in aircrafts- Altimeter

The temperature of the sun is measured with- Pyrometer
Thermometer used to measure very low temperature- Cryometer
Instrument used to measure change in volume of substances- Dilatometer
Instrument used to measure force & velocity of wind- Anemometer

Which waves are used in sonography- Ultrasonic waves

•Infrasonic Waves-  (0 to 20 Hz)

•Audible waves –   (20 to 20,000 Hz)

•Ultrasonic waves – (>20,000 Hz)

Velocity of wave = Frequency × Wavelength.

•SONAR stands for Sound Navigation And Ranging.

•The transmitter of a sonar produces pulses of ultrasonic sound waves of a frequency of about 50000 Hz. 

•The size of atomic nucleus is- 10^-14 m

•What is used as a moderator in nuclear reactor- Graphite

•The temperature at which both the Fahrenheit and the centigrade scales have the same value-

  - 40°

•C/5 = (F-32)/9

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