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. Intensity of sound is linked to pressure by

A. I=P/ρ

B. I=ρ/P

C. 𝐼 = 𝑃²/( 𝜌 𝑐 )

D. I= √P⋅c

2 / 40

2. SONAR uses

A. Light pulses

B. Electromagnetic resonance

C. Magnetic levitation

D. Sound pulses and echoes

3 / 40

3. Air elements move together as a unit in

A. Laminar flow

B. Random turbulence

C. Sinusoidal wave motion

D. Optical resonance

4 / 40

4. Frequency detected by an observer increases if

A. Source and observer are stationary

B. Observer moves away

C. Source moves toward observer

D. Medium absorbs waves

5 / 40

5. Threshold of hearing corresponds to intensity of

A. 1.0 W/m²

B. 1.0 × 10⁻⁶ W/m²

C. 1.0 × 10⁻¹² W/m²

D. 1.0 × 10⁻⁴ W/

6 / 40

6. Frequency of a sound source remains unchanged

A. If velocity decreases

B. While entering a new medium

C. When intensity drops

D. After wavelength increases

7 / 40

7. Speed of sound in an ideal gas depends on

A. Altitude only

B. Temperature and molar mass

C. Volume and entropy

D. Pressure and density

8 / 40

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

A. Lower specific heat

B. Higher moisture content

C. Lower refractive index

D. Greater elasticity

9 / 40

9. Heating a solid generally results in

A. Increased sound speed

B. Sharpened shear response

C. Reduced stiffness

D. Decreased density

10 / 40

10. Refraction of sound is caused by

A. Speed variation in different layers

B. Molecular bonding

C. Fixed velocity

D. Energy absorption

11 / 40

11. Solids support propagation of

A. Only shear waves

B. Electromagnetic waves only

C. Only longitudinal waves

D. Both shear and longitudinal waves

12 / 40

12. In gases, sound waves are

A. Torsional

B. Rotational

C. Transverse only

D. Longitudinal

13 / 40

13. Frequencies above the human hearing range are referred to as

A. Supersound

B. Ultrasound

C. Megasound

D. Macrosound

14 / 40

14. The unit of intensity is

A. N/m²

B. J/kg

C. Hz/s

D. W/m²

15 / 40

15. The wavelength of a sound wave is measured between

A. Velocity nodes

B. Pressure amplitudes

C. Standing wave peaks

D. Consecutive compressions or rarefactions

16 / 40

16. In water, sound waves travel as

A. Circular waves

B. Longitudinal waves

C. Standing waves

D. Transverse waves

17 / 40

17. In a sound wave, zero displacement occurs at

A. Maximum amplitude

B. Minimum velocity

C. Maximum or minimum pressure

D. Average wavelength

18 / 40

18. Human hearing range extends approximately from

A. 2 Hz to 2 kHz

B. 200 Hz to 200 kHz

C. 2 kHz to 200 kHz

D. 20 Hz to 20 kHz

19 / 40

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

A. 1071 m

B. 150 m

C. 2142 m

D. 765 m

20 / 40

20. In fluids, sound speed depends on

A. Young’s modulus and volume

B. Surface tension

C. Gravitational strength

D. Bulk modulus and density

21 / 40

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

A. Crust

B. Mantle

C. Outer core

D. Inner core

22 / 40

22. Doppler effect involves frequency change due to

A. Phase mismatch

B. Relative motion of source or observer

C. Wave interference

D. Temperature fluctuation

23 / 40

23. Sound propagates through air as

A. Magnetic pulses

B. Electrical oscillations

C. Pressure waves

D. Gamma rays

24 / 40

24. Speed of sound in a medium increases with

A. Increased damping

B. Higher compressibility

C. Greater rigidity

D. Greater density

25 / 40

25. Sound wavelength becomes shorter in a medium with

A. Higher damping

B. Slower wave speed

C. Higher frequency

D. Lower stiffness

26 / 40

26. Sound pressure is most easily detected in

A. Oil

B. Dense metals

C. Vacuum

D. Air

27 / 40

27. Heating a solid generally results in

A. Reduced stiffness

B. Increased sound speed

C. Decreased density

D. Sharpened shear response

28 / 40

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

A. 343 m/s

B. 1007 m/s

C. 5120 m/s

D. 1540 m/s

29 / 40

29. Longitudinal wave speed in a solid depends on

A. Young’s modulus and density

B. Shear modulus and damping

C. Volume and frequency

D. Atomic weight and heat capacity

30 / 40

30. Sound speed in an ideal gas increases with

A. Constant entropy

B. Increase in temperature

C. Decrease in temperature

D. Decrease in pressure

31 / 40

31. Intensity measures

A. Maximum wavelength

B. Total pressure

C. Energy per unit time per unit area

D. Sound quality

32 / 40

32. Bulk modulus is most relevant for sound speed in

A. Vacuum

B. Superconductors

C. Glass fibers

D. Liquids

33 / 40

33. Solids support propagation of

A. Electromagnetic waves only

B. Only shear waves

C. Only longitudinal waves

D. Both shear and longitudinal waves

34 / 40

34. Sound travels slowest in

A. Water

B. Steel

C. Air

D. Mercury

35 / 40

35. Sound travels fastest in

A. Helium

B. Steel

C. Air

D. Water

36 / 40

36. Sound travels by causing

A. Thermal conduction

B. Particle vibration

C. Nuclear fission

D. Electron tunneling

37 / 40

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

A. 1481 m/s

B. 5120 m/s

C. 343 m/s

D. 1007 m/s

38 / 40

38. In gases, sound waves are

A. Rotational

B. Longitudinal

C. Transverse only

D. Torsional

39 / 40

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

A. Smaller sound amplitude

B. Higher molar mass

C. Higher density

D. Larger adiabatic index

40 / 40

40. Sound attenuation increases with

A. Wavelength decrease

B. Frequency increase

C. Gas purification

D. Lower pressure

Your score is

The average score is 50%

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