Medical Physics ALL MCQs; 1st year Question and Answers done and tested by the best Pass Guarantee

Medical Physics ALL MCQs; 1st year Question and Answers done and tested by the best Pass Guarantee 1. Sound amplification in the outer ear (auditory canal)is affected by: a. Sound speed b. Sound pressure c. Sound amplitude - ANS b. Sound pressure 2. Prolonged exposure to loud noise can cause permanent damage to: a. The air conductivity (of the ear) b. The structure of the eardrum (tympanic membrane) c. Inner ear - ANS c. Inner ear 3. The loss of elasticity (stiffening) of the tympanic membrane will result in: a. Increase of air conductivity b. Decrease of hearing threshold c. Decrease in the binaural effect - ANS b. Decrease of hearing threshold 4. Sound intensity level (dB) and Loudness (phones) will have the same magnitude at the following frequency: a. 20 Hz b. 1000 Hz c. 20 KHz - ANS b. 1000 Hz 5. Refer to the equal-loudness curve above. At frequency of 4000 Hz the perceived sound is: a. Louder than at 1000 Hz b. The same as at 1000 Hz c. Softer than at 1000 Hz - ANS a. Louder than at 1000 Hz 6. Sound Intensity Level is proportional to the logarithm of the ratio of incoming to threshold intensity SIL = 10·Log (I/I0). If intensity is increased by a factor of 100, what is change in SIL? a. Increase by a factor of 10 (10 times) b. Double (2 times) c. Increase with 20 dB (plus 20dB) - ANS c. Increase with 20 dB (plus 20dB) 7. The sound intensity level in a room is 20 dB. A TV produces additional intensity level of 60 dB. What is the sound intensity in the room now? a. 80 dB b. 40 dB c. 60 dB - ANS c. 60 dB 8. Match the physical (objective) with the corresponding psychophysical (subjective) properties of the sound: (hint: multiple connections are possible) a. Frequency b. Intensity c. Acoustic spectrum 1. Timbre 2. Pitch 3. Loudness - ANS a. - 2.; b. - 3.; c. - 1. 9. Sound frequency is: a. Psychophysical property (subjective) b. Physical property (objective) c. Sound is measured in wavelength, and light is measured in frequency - ANS b. Physical property (objective) 10. The fundamental harmonic (frequency f0) in a complex sound is characterized by: a. The lowest frequency and highest amplitude b. The highest frequency and lowest amplitude c. The highest frequency and highest amplitude - ANS a. The lowest frequency and highest amplitude 11. The speed of sound is calculated by the Newton-Laplace formula √(K/ρ), where K is the stiffness coefficient, and ρ is the density of the material. If the density of the substance doubles, the speed of propagating sound wave will: