Noise, Vibration, EMF

Noise, Vibration, EMF

Variant 1

Test 1. What is the noise in physics?

A. the chaotic sound fluctuations of different frequency rate from 16 to 20000 Herz and different intensity, having no regularity

B. sound from 16 to 20000 Herz, preventing recognition of useful sound signals

C. sound more than 20000 Herz, interfering with rest, rendering a negative effect on a human organism and decreasing his capacity for work

D. the chaotic sound fluctuations less than 1 Herz frequency rate and intensity, having no regularity

E. the chaotic sound fluctuations from 1 Herz to 20 herz frequency rate and intensity, having no regularity

Test 2. What is the noise in Hygiene?

A. the chaotic sound fluctuations of different frequency rate from 16 to 20000Herz and different intensity, having no regularity

B. sound from 16 to 20000 Herz, preventing recognition of useful sound signals

C. sound from 16 to 20000 Herz rendering a negative effect on a human organism and decreasing his capacity for work

D. the chaotic sound fluctuations less than 1 Herz frequency rate and intensity, having no regularity

E. the chaotic sound fluctuations from 1 Herz to 20 herz frequency rate and intensity, having no regularity

Test 3. Classification of Noise according to sources:

A. household

B.transport

C.industrial

D.building

E. agricultural

Test 4. Classification of Noise according tofrequency:

A. low-frequency – from 16 to 400 Hz

B. medium-frequency - 400-1,000 Hz

C. high-frequency - over 1,000 to 20000 Hz

D. very high frequency more than than 20000 Hz

E. infrasound frequency less than 1 Hz

Test 5. What is the low-frequency noise?

A. noise with the frequency – from 16 to 400 Hz

B. noise with the frequency 400-1,000 Hz

C. noise with the frequency from 1,000 to 20000 Hz

D. noise with the frequency more than than 20000 Hz

E. noise with the frequency less than 1 Hz

Test 6. What is the medium-frequency noise?

A. noise with the frequency – from 16 to 400 Hz

B. noise with the frequency 400-1,000 Hz

C. noise with the frequency from 1,000 to 20000 Hz

D. noise with the frequency more than than 20000 Hz

E. noise with the frequency less than 1 Hz

Test 7. What is the high-frequency noise?

A. noise with the frequency – from 16 to 400 Hz

B. noise with the frequency 400-1,000 Hz

C. noise with the frequency from 1,000 to 20000 Hz

D. noise with the frequency more than than 20000 Hz

E. noise with the frequency less than 1 Hz

Test 8. What is the infrasound waves?

A. waves with the frequency up to 1000 Hz

B. waves with the frequency up to 20 Hz

C. waves with the frequency from 20 Hz to 20000Hz

D. waves with the frequency less than 1 Hz

E. waves with the frequency from 1000 Hz to 2000 Hz

Test 9. What is the audible sounds?

A. waves with the frequency up to 1000 Hz

B. waves with the frequency up to 20 Hz

C. waves with the frequency from 20 Hz to 20000Hz

D. waves with the frequency less than 1 Hz

E. waves with the frequency from 1000 Hz to 2000 Hz

Test 10. What is the length of infrasound waves ?

A. waves with the frequency up to 1000 Hz

B. waves with the frequency up to 20 Hz

C. waves with the frequency from 20 Hz to 20000Hz

D. waves with the frequency less than 1 Hz

E. waves with the frequency from 1000 Hz to 2000 Hz

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