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 travels fastest in

A. Steel

B. Air

C. Helium

D. Water

2 / 40

2. Sound intensity level in decibels is calculated using

A. 100 × (I × I₀)

B. 10 log(I/I₀)

C. I² + I₀²

D. 5 log(I/I₀)

3 / 40

3. In water, sound waves travel as

A. Standing waves

B. Transverse waves

C. Longitudinal waves

D. Circular waves

4 / 40

4. Sound travels by causing

A. Nuclear fission

B. Particle vibration

C. Electron tunneling

D. Thermal conduction

5 / 40

5. Heating a solid generally results in

A. Decreased density

B. Increased sound speed

C. Reduced stiffness

D. Sharpened shear response

6 / 40

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

A. Inner core

B. Crust

C. Mantle

D. Outer core

7 / 40

7. Wave speed in a medium increases with

A. Lower stiffness

B. Greater compressibility

C. Decreased temperature

D. Higher elasticity

8 / 40

8. In gases, sound waves are

A. Transverse only

B. Longitudinal

C. Rotational

D. Torsional

9 / 40

9. In a sound wave, zero displacement occurs at

A. Minimum velocity

B. Average wavelength

C. Maximum amplitude

D. Maximum or minimum pressure

10 / 40

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

A. Absorption point

B. Diffusion zone

C. Compression

D. Convection pocket

11 / 40

11. 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

12 / 40

12. Bulk modulus is most relevant for sound speed in

A. Superconductors

B. Liquids

C. Glass fibers

D. Vacuum

13 / 40

13. The unit of intensity is

A. Hz/s

B. N/m²

C. J/kg

D. W/m²

14 / 40

14. In gases, sound waves are

A. Longitudinal

B. Transverse only

C. Rotational

D. Torsional

15 / 40

15. Sound wavelength becomes shorter in a medium with

A. Higher frequency

B. Higher damping

C. Slower wave speed

D. Lower stiffness

16 / 40

16. Solids support propagation of

A. Only longitudinal waves

B. Only shear waves

C. Electromagnetic waves only

D. Both shear and longitudinal waves

17 / 40

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

A. Shear modulus is less than bulk modulus

B. Gas interference occurs

C. Density is doubled

D. Pressure is minimized

18 / 40

18. Doppler effect involves frequency change due to

A. Wave interference

B. Relative motion of source or observer

C. Phase mismatch

D. Temperature fluctuation

19 / 40

19. Wave speed is calculated using

A. Frequency times wavelength

B. Amplitude times pressure

C. Force divided by area

D. Frequency plus period

20 / 40

20. Sound attenuation increases with

A. Lower pressure

B. Frequency increase

C. Gas purification

D. Wavelength decrease

21 / 40

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

A. Higher density

B. Higher molar mass

C. Larger adiabatic index

D. Smaller sound amplitude

22 / 40

22. Ultrasonic imaging relies on

A. Chemical absorption

B. Radio wave scattering

C. Gamma radiation penetration

D. High-frequency sound reflection

23 / 40

23. Heating a solid generally results in

A. Sharpened shear response

B. Decreased density

C. Reduced stiffness

D. Increased sound speed

24 / 40

24. Sound travels slowest in

A. Air

B. Steel

C. Mercury

D. Water

25 / 40

25. Displacement amplitude is related to

A. Current strength

B. Surface tension

C. Pressure amplitude

D. Velocity square

26 / 40

26. Frequency of a sound source remains unchanged

A. While entering a new medium

B. After wavelength increases

C. When intensity drops

D. If velocity decreases

27 / 40

27. Air elements move together as a unit in

A. Random turbulence

B. Laminar flow

C. Sinusoidal wave motion

D. Optical resonance

28 / 40

28. Sound wavelength becomes shorter in a medium with

A. Higher frequency

B. Slower wave speed

C. Lower stiffness

D. Higher damping

29 / 40

29. 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

30 / 40

30. Shear waves cannot exist in

A. Glass

B. Bones

C. Steel rods

D. Water

31 / 40

31. Speed of sound in an ideal gas depends on

A. Volume and entropy

B. Altitude only

C. Pressure and density

D. Temperature and molar mass

32 / 40

32. SONAR uses

A. Magnetic levitation

B. Electromagnetic resonance

C. Light pulses

D. Sound pulses and echoes

33 / 40

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

A. 1007 m/s

B. 1481 m/s

C. 343 m/s

D. 5120 m/s

34 / 40

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

A. 1540 m/s

B. 5120 m/s

C. 343 m/s

D. 1007 m/s

35 / 40

35. In fluids, sound speed depends on

A. Young’s modulus and volume

B. Bulk modulus and density

C. Gravitational strength

D. Surface tension

36 / 40

36. String wave speed is influenced by

A. Color and opacity

B. Tension and mass per unit length

C. Mass volume

D. Thermal expansion

37 / 40

37. Sound propagates through air as

A. Gamma rays

B. Electrical oscillations

C. Magnetic pulses

D. Pressure waves

38 / 40

38. Threshold of hearing corresponds to intensity of

A. 1.0 W/m²

B. 1.0 × 10⁻¹² W/m²

C. 1.0 × 10⁻⁴ W/

D. 1.0 × 10⁻⁶ W/m²

39 / 40

39. Refraction of sound is caused by

A. Speed variation in different layers

B. Fixed velocity

C. Energy absorption

D. Molecular bonding

40 / 40

40. Sound travels by causing

A. Electron tunneling

B. Thermal conduction

C. Particle vibration

D. Nuclear fission

Your score is

The average score is 51%

FUOYE PHY 104 CBT Practice

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