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. Sound moves faster in helium than in air due to

A. Larger adiabatic index

B. Higher density

C. Higher molar mass

D. Smaller sound amplitude

2 / 40

2. Human hearing range extends approximately from

A. 20 Hz to 20 kHz

B. 200 Hz to 200 kHz

C. 2 Hz to 2 kHz

D. 2 kHz to 200 kHz

3 / 40

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

A. Diffusion zone

B. Compression

C. Convection pocket

D. Absorption point

4 / 40

4. Intensity measures

A. Total pressure

B. Maximum wavelength

C. Energy per unit time per unit area

D. Sound quality

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. Speed of sound in an ideal gas depends on

A. Volume and entropy

B. Pressure and density

C. Altitude only

D. Temperature and molar mass

7 / 40

7. Sound travels fastest in

A. Water

B. Steel

C. Helium

D. Air

8 / 40

8. In gases, sound waves are

A. Longitudinal

B. Torsional

C. Transverse only

D. Rotational

9 / 40

9. Air elements move together as a unit in

A. Laminar flow

B. Sinusoidal wave motion

C. Random turbulence

D. Optical resonance

10 / 40

10. Wave speed in a medium increases with

A. Greater compressibility

B. Higher elasticity

C. Decreased temperature

D. Lower stiffness

11 / 40

11. Heating a solid generally results in

A. Reduced stiffness

B. Sharpened shear response

C. Increased sound speed

D. Decreased density

12 / 40

12. In water, sound waves travel as

A. Circular waves

B. Transverse waves

C. Longitudinal waves

D. Standing waves

13 / 40

13. Threshold of hearing corresponds to intensity of

A. 1.0 × 10⁻¹² W/m²

B. 1.0 × 10⁻⁶ W/m²

C. 1.0 W/m²

D. 1.0 × 10⁻⁴ W/

14 / 40

14. Sound wavelength becomes shorter in a medium with

A. Lower stiffness

B. Slower wave speed

C. Higher frequency

D. Higher damping

15 / 40

15. Doppler effect involves frequency change due to

A. Wave interference

B. Temperature fluctuation

C. Phase mismatch

D. Relative motion of source or observer

16 / 40

16. Frequency of a sound source remains unchanged

A. While entering a new medium

B. If velocity decreases

C. When intensity drops

D. After wavelength increases

17 / 40

17. Wave speed is calculated using

A. Frequency times wavelength

B. Frequency plus period

C. Amplitude times pressure

D. Force divided by area

18 / 40

18. Sound wavelength becomes shorter in a medium with

A. Higher damping

B. Higher frequency

C. Lower stiffness

D. Slower wave speed

19 / 40

19. Intensity of sound is linked to pressure by

A. I= √P⋅c

B. 𝐼 = 𝑃²/( 𝜌 𝑐 )

C. I=ρ/P

D. I=P/ρ

20 / 40

20. Bulk modulus is most relevant for sound speed in

A. Superconductors

B. Glass fibers

C. Liquids

D. Vacuum

21 / 40

21. Sound attenuation increases with

A. Lower pressure

B. Wavelength decrease

C. Frequency increase

D. Gas purification

22 / 40

22. Solids support propagation of

A. Only longitudinal waves

B. Electromagnetic waves only

C. Only shear waves

D. Both shear and longitudinal waves

23 / 40

23. In fluids, sound speed depends on

A. Bulk modulus and density

B. Gravitational strength

C. Young’s modulus and volume

D. Surface tension

24 / 40

24. Ultrasonic imaging relies on

A. High-frequency sound reflection

B. Gamma radiation penetration

C. Chemical absorption

D. Radio wave scattering

25 / 40

25. Shear waves cannot exist in

A. Glass

B. Bones

C. Water

D. Steel rods

26 / 40

26. Sound propagates through air as

A. Electrical oscillations

B. Gamma rays

C. Pressure waves

D. Magnetic pulses

27 / 40

27. Frequency detected by an observer increases if

A. Medium absorbs waves

B. Observer moves away

C. Source moves toward observer

D. Source and observer are stationary

28 / 40

28. String wave speed is influenced by

A. Color and opacity

B. Tension and mass per unit length

C. Thermal expansion

D. Mass volume

29 / 40

29. 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

30 / 40

30. Sound intensity level in decibels is calculated using

A. 10 log(I/I₀)

B. I² + I₀²

C. 5 log(I/I₀)

D. 100 × (I × I₀)

31 / 40

31. The wavelength of a sound wave is measured between

A. Velocity nodes

B. Pressure amplitudes

C. Consecutive compressions or rarefactions

D. Standing wave peaks

32 / 40

32. Refraction of sound is caused by

A. Speed variation in different layers

B. Fixed velocity

C. Molecular bonding

D. Energy absorption

33 / 40

33. 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

34 / 40

34. Heating a solid generally results in

A. Reduced stiffness

B. Decreased density

C. Sharpened shear response

D. Increased sound speed

35 / 40

35. A sonar echo returning in 1.4 s with speed 1530 m/s suggests a depth of

A. 765 m

B. 150 m

C. 1071 m

D. 2142 m

36 / 40

36. Solids support propagation of

A. Electromagnetic waves only

B. Both shear and longitudinal waves

C. Only shear waves

D. Only longitudinal waves

37 / 40

37. Speed of sound in a medium increases with

A. Greater density

B. Greater rigidity

C. Increased damping

D. Higher compressibility

38 / 40

38. SONAR uses

A. Light pulses

B. Electromagnetic resonance

C. Magnetic levitation

D. Sound pulses and echoes

39 / 40

39. Sound travels slowest in

A. Water

B. Air

C. Mercury

D. Steel

40 / 40

40. Sound speed in an ideal gas increases with

A. Constant entropy

B. Decrease in pressure

C. Decrease in temperature

D. Increase in temperature

Your score is

The average score is 51%

FUOYE PHY 104 CBT Practice

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