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Q.1) The velocity of sound in moist air is more than in dry air because the moist air has

(A) Less pressure than dry air

(B) More density than dry air

(C) Less density than dry air

(D) More pressure than dry air

Q.2) Hertz is the unit of

(A) Frequency

(B) Wavelength

(C) Intensity

(D) Clarity of waves

Q.3) The unit of noise pollution (level) is

(A) Decibel

(B) Decimal

(C) Ppm

(D) None of the above

Q.4) What is decibel?

(A) A musical instrument

(B) Wavelength of noise

(C) A musical note

(D) Scale of sound level

Q.5) The permissible noise level at residential area during day time is..

(A) 45 dB

(B) 55 dB

(C) 75 dB

(D) 80 dB

Q.6) The range of frequency of ultrasonic wave.

(A) Greater than 20 KHz

(B) Greater than 20,000 KHz

(C) Below than 20 KHz

(D) Greater than 02 KHz

Q.7) In which of the following frequency range, human car feels the senstivity of vibration of sound?

(A) 0 - 5 Hz

(B) 6 - 10 Hz

(C) 11 - 15 Hz

(D) 20 - 20,000 Hz

Q.8) If the ratio of intensity of wave is 25:9. what is the ratio of their amplitude?

(A) 50:18:00

(B) 5:03

(C) 3:05

(D) 25:09:00

Q.9) Supersonic air plane creates a shock wave called

(A) Transition wave

(B) Ultrasound wave

(C) Sonic boom

(D) Transverse

Q.10) Which of the following does not have any effect on velocity of sound?

(A) Pressure

(B) Temperature

(C) Humidity

(D) Density

ਜੇਕਰ ਤੁਸੀ ਕਿਸੇ ਵੀ ਸਰਕਾਰੀ ਨੌਕਰੀ ਬਾਰੇ ਜਾਣਕਾਰੀ ਲੈਣਾ ਚਾਹੁੰਦੇ ਹੋ ਤਾ ਉੱਤੇ ਦਿੱਤੇ ਕੰਮੈਟ ਬਾਕਸ ਵਿੱਚ ਕੰਮੈਟ ਕਰ ਸਕਦੇ ਹੋ ਧੰਨਵਾਦ ਅਰਨ ਮਨੀ ਜੋਬਜ ਟੀਮ