Take your time to read instructions before taking this test.

There are 40 questions which you are to answer in 15 minutes that gives you roughly 30 seconds per question.

If you can get at least 60%, you can be rest assured that you’ll ace PHY 104 exam

In a normal exam you will be asked between 40 – 60 questions but I only arranged 40 questions

Note

Do not be in a hurry to answer the questions
Do not waste time on a question you don’t know
Move as fast as possible and starting with questions that don’t have calculation first to save time
Always crosscheck
Don’t be in a hurry to submit, you are not in a competition
Don’t be scared. Getting an A is easy
Don’t be over confident, you can end up a D, E or F. Calm your blood, no be only you sabi book
Please do well to use our comment box incase there’s a message you want to pass to us

70 – 100 A

60 – 69 B

50 – 59 C

45 – 49 D

40 – 44 E

0 – 39 F

I wish you success

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PHY 104

1 / 40

1. In a sound wave, zero displacement occurs at

A. Average wavelength

B. Minimum velocity

C. Maximum or minimum pressure

D. Maximum amplitude

2 / 40

2. Sound speed in an ideal gas increases with

A. Decrease in pressure

B. Increase in temperature

C. Decrease in temperature

D. Constant entropy

3 / 40

3. Sound travels by causing

A. Nuclear fission

B. Electron tunneling

C. Particle vibration

D. Thermal conduction

4 / 40

4. Intensity of sound is linked to pressure by

A. I=P/ρ

B. 𝐼 = 𝑃²/( 𝜌 𝑐 )

C. I= √P⋅c

D. I=ρ/P

5 / 40

5. A major reason for higher sound speed in solids compared to gases is

A. Higher moisture content

B. Lower refractive index

C. Greater elasticity

D. Lower specific heat

6 / 40

6. Transverse wave speed is lower than longitudinal wave speed because

A. Density is doubled

B. Shear modulus is less than bulk modulus

C. Pressure is minimized

D. Gas interference occurs

7 / 40

7. In gases, sound waves are

A. Torsional

B. Longitudinal

C. Rotational

D. Transverse only

8 / 40

8. Longitudinal wave speed in a solid depends on

A. Volume and frequency

B. Shear modulus and damping

C. Atomic weight and heat capacity

D. Young’s modulus and density

9 / 40

9. Intensity measures

A. Sound quality

B. Maximum wavelength

C. Energy per unit time per unit area

D. Total pressure

10 / 40

10. Solids support propagation of

A. Only longitudinal waves

B. Both shear and longitudinal waves

C. Only shear waves

D. Electromagnetic waves only

11 / 40

11. In fluids, sound speed depends on

A. Young’s modulus and volume

B. Surface tension

C. Bulk modulus and density

D. Gravitational strength

12 / 40

12. Displacement amplitude is related to

A. Velocity square

B. Current strength

C. Pressure amplitude

D. Surface tension

13 / 40

13. Ultrasonic imaging relies on

A. Chemical absorption

B. Gamma radiation penetration

C. High-frequency sound reflection

D. Radio wave scattering

14 / 40

14. Sound travels by causing

A. Electron tunneling

B. Particle vibration

C. Nuclear fission

D. Thermal conduction

15 / 40

15. Heating a solid generally results in

A. Reduced stiffness

B. Increased sound speed

C. Sharpened shear response

D. Decreased density

16 / 40

16. A region of higher pressure in a sound wave is known as

A. Convection pocket

B. Absorption point

C. Diffusion zone

D. Compression

17 / 40

17. Heating a solid generally results in

A. Decreased density

B. Increased sound speed

C. Sharpened shear response

D. Reduced stiffness

18 / 40

18. In water, sound waves travel as

A. Standing waves

B. Longitudinal waves

C. Circular waves

D. Transverse waves

19 / 40

19. Seismic S-waves fail to travel through Earth’s

A. Crust

B. Inner core

C. Outer core

D. Mantle

20 / 40

20. Speed of sound in an ideal gas depends on

A. Temperature and molar mass

B. Altitude only

C. Volume and entropy

D. Pressure and density

21 / 40

21. Solids support propagation of

A. Electromagnetic waves only

B. Both shear and longitudinal waves

C. Only shear waves

D. Only longitudinal waves

22 / 40

22. Sound intensity level in decibels is calculated using

A. 10 log(I/I₀)

B. 100 × (I × I₀)

C. I² + I₀²

D. 5 log(I/I₀)

23 / 40

23. Doppler effect involves frequency change due to

A. Temperature fluctuation

B. Relative motion of source or observer

C. Phase mismatch

D. Wave interference

24 / 40

24. At 20 °C, sound travels in air at approximately

A. 1007 m/s

B. 1481 m/s

C. 5120 m/s

D. 343 m/s

25 / 40

25. Sound attenuation increases with

A. Frequency increase

B. Wavelength decrease

C. Lower pressure

D. Gas purification

26 / 40

26. String wave speed is influenced by

A. Thermal expansion

B. Tension and mass per unit length

C. Color and opacity

D. Mass volume

27 / 40

27. Sound pressure is most easily detected in

A. Air

B. Dense metals

C. Oil

D. Vacuum

28 / 40

28. Human hearing range extends approximately from

A. 2 kHz to 200 kHz

B. 20 Hz to 20 kHz

C. 200 Hz to 200 kHz

D. 2 Hz to 2 kHz

29 / 40

29. Air elements move together as a unit in

A. Sinusoidal wave motion

B. Laminar flow

C. Optical resonance

D. Random turbulence

30 / 40

30. Sound travels slowest in

A. Water

B. Steel

C. Air

D. Mercury

31 / 40

31. Medical ultrasound typically assumes sound speed in soft tissue as

A. 5120 m/s

B. 1007 m/s

C. 1540 m/s

D. 343 m/s

32 / 40

32. Frequency detected by an observer increases if

A. Medium absorbs waves

B. Observer moves away

C. Source and observer are stationary

D. Source moves toward observer

33 / 40

33. Sound wavelength becomes shorter in a medium with

A. Higher damping

B. Lower stiffness

C. Slower wave speed

D. Higher frequency

34 / 40

34. Shear waves cannot exist in

A. Steel rods

B. Glass

C. Water

D. Bones

35 / 40

35. SONAR uses

A. Magnetic levitation

B. Light pulses

C. Sound pulses and echoes

D. Electromagnetic resonance

36 / 40

36. The unit of intensity is

A. Hz/s

B. N/m²

C. J/kg

D. W/m²

37 / 40

37. Wave speed is calculated using

A. Frequency times wavelength

B. Frequency plus period

C. Amplitude times pressure

D. Force divided by area

38 / 40

38. Sound propagates through air as

A. Gamma rays

B. Electrical oscillations

C. Magnetic pulses

D. Pressure waves

39 / 40

39. Sound moves faster in helium than in air due to

A. Higher density

B. Smaller sound amplitude

C. Larger adiabatic index

D. Higher molar mass

40 / 40

40. Refraction of sound is caused by

A. Speed variation in different layers

B. Energy absorption

C. Fixed velocity

D. Molecular bonding

Your score is

The average score is 51%

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