FMT NAVY PHYSICS QUIZ 4
Results
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FAIL
#1. Magnetic lines of force:
#2. Force on a moving charge in a magnetic field is maximum when angle is:
#3. Charge to mass ratio (e/m) of an electron was determined by:
#4. Galvanometer can be converted into an ammeter by connecting a:
#5. Galvanometer can be converted into a voltmeter by connecting a:
#6. Energy stored in an inductor is in the form of:
#7. In an AC circuit, the average power over a complete cycle is zero when circuit contains:
#8. RMS value of alternating current is related to peak value I0 by:
#9. Modulation is the process of:
#10. Which photon has the highest energy?
#11. De-Broglie wavelength of a moving particle is given by:
#12. Compton effect proves the:
#13. Heisenberg Uncertainty Principle deals with position and:
#14. In Bohr’s atomic model, angular momentum is quantized as integral multiple of:
#15. Lyman series of hydrogen spectrum lies in:
#16. Balmer series of hydrogen spectrum lies in:
#17. Laser light is highly:
#18. Nuclear reactor uses control rods made of:
#19. Moderator in a nuclear reactor is used to:
#20. Nuclear fusion reaction occurs at very:
#21. Energy source of the Sun and stars is:
#22. The antiparticle of an electron is:
#23. Quarks combine to form:
#24. NOT gate is also called an:
#25. AND gate output is 1 only when:
#26. OR gate output is 0 only when:
#27. Universal logic gates are:
#28. Operational amplifier has an open loop gain of the order of:
#29. Inverting amplifier output is out of phase with input by:
#30. The threshold frequency depends upon:
PAK NAVY FMT · PHYSICS PRACTICE
Physics Quiz 4: Light, Sound and Waves
Discover how waves carry energy and how light and sound behave in different situations.
Learn About Waves
Pak Navy FMT Physics Quiz 4 focuses on light, sound, reflection, refraction, and wave properties. These topics help students understand how we see objects, how sound reaches our ears, and how waves transfer energy.
A wave is a disturbance that transfers energy from one place to another. Mechanical waves require a medium, while electromagnetic waves can travel through a vacuum.
Main Concepts
- Frequency and wavelength
- Wave speed
- Reflection and refraction of light
- Sound waves and their properties
- Differences between light and sound
Frequency, Wavelength and Wave Speed
Wavelength is the distance between two successive points in the same phase, such as two neighbouring crests. Frequency is the number of complete cycles passing a point per second.
v = fλ
Wave speed = Frequency × Wavelength
Frequency is measured in hertz (Hz), and wavelength in metres (m).
Reflection and Refraction
Reflection
Reflection occurs when a wave strikes a surface and returns to the original medium. For light reflecting from a surface, the angle of incidence equals the angle of reflection when measured from the normal.
Example: Seeing your image in a plane mirror.
Refraction
Refraction is the change in direction of a wave when it enters another medium at an angle and its speed changes.
Example: A pencil partly submerged in water may appear bent.
Understanding Sound
Sound is a mechanical wave produced by vibrating objects. In air, sound travels through compressions and rarefactions. Because sound needs a medium, it cannot travel through a perfect vacuum.
The frequency of a sound wave is associated with its pitch, while its amplitude is related to loudness. Sound travels at different speeds in different materials and is generally faster in liquids and solids than in gases.
Light Versus Sound
Light: An electromagnetic wave that can travel through a vacuum.
Sound: A mechanical wave that requires a material medium.
How to Prepare for These MCQs
Learn the definitions of frequency, wavelength, and amplitude. Practise the wave equation using simple values. For conceptual questions, decide whether the example describes reflection, refraction, or the propagation of sound.
Pay particular attention to the difference between light and sound. Their ability to travel through a vacuum is a common introductory physics concept.
Final Review
- Memorise v = fλ.
- Know the units of frequency and wavelength.
- Understand reflection and refraction.
- Remember that sound needs a medium.
Educational notice: This is an independent physics practice resource, not an official Pakistan Navy FMT examination paper.