MCQ Physics Chapter–15: Waves, HS 1st year

 

---

Section 1: Introduction to Waves

1. What do waves primarily transport?

   • A) Matter
   • B) Energy
   • C) Momentum
   • D) Mass
   • Answer: B

2. Which type of waves can propagate through a vacuum?

   • A) Mechanical waves
   • B) Electromagnetic waves
   • C) Matter waves
   • D) Surface waves
   • Answer: B

3. What type of wave is associated with electrons in quantum mechanics?

   • A) Sound waves
   • B) Matter waves
   • C) Electromagnetic waves
   • D) Mechanical waves
   • Answer: B

4. Which of the following is not a mechanical wave?

   • A) Sound waves
   • B) Light waves
   • C) Seismic waves
   • D) Water waves
   • Answer: B

5. Who was not involved in the early scientific analysis of wave motion?

   • A) Christiaan Huygens
   • B) Robert Hooke
   • C) Isaac Newton
   • D) Albert Einstein
   • Answer: D

---

Section 2: Types of Waves

6. In transverse waves, particles oscillate:

   • A) Parallel to wave propagation
   • B) Perpendicular to wave propagation
   • C) At an angle to wave propagation
   • D) None of the above
   • Answer: B

7. Which waves require a medium for propagation?

   • A) Light waves
   • B) Sound waves
   • C) Electromagnetic waves
   • D) Gravitational waves
   • Answer: B

8. Capillary waves are primarily restored by:

   • A) Gravity
   • B) Surface tension
   • C) Elasticity
   • D) Pressure
   • Answer: B

9. Which property allows longitudinal waves to propagate in all media?

   • A) Shear modulus
   • B) Bulk modulus
   • C) Surface tension
   • D) Density
   • Answer: B

10. The motion of particles in water waves is:

    • A) Linear
    • B) Circular
    • C) Elliptical
    • D) Back and forth only
    • Answer: C

---

Section 3: Wave Properties

11. What is the relation between wavelength ($λ$) and wave number ($k$)?

    • A) $k = 2π/λ$
    • B) $k = λ/2π$
    • C) $k = λ$
    • D) $k = 2λ/π$
    • Answer: A

12. The speed of a wave ($v$) is given by:

    • A) $v = λT$
    • B) $v = λ/T$
    • C) $v = T/λ$
    • D) $v = Tλ^2$
    • Answer: B

13. What is the SI unit of angular frequency ($ω$)?

    • A) Hz
    • B) rad/s
    • C) m/s
    • D) s
    • Answer: B

14. What does the amplitude of a wave represent?

    • A) Frequency of oscillations
    • B) Maximum displacement
    • C) Phase difference
    • D) Speed of the wave
    • Answer: B

15. In a harmonic wave, the phase difference between two successive crests is:

    • A) π
    • B) 2π
    • C) π/2
    • D) None of the above
    • Answer: B

---

Section 4: Wave Speed and Superposition

16. The speed of transverse waves on a string is proportional to:

    • A) Tension
    • B) Linear mass density
    • C) Both tension and linear mass density
    • D) Neither tension nor mass density
    • Answer: C

17. What happens to a wave at a rigid boundary?

    • A) Phase reversal
    • B) Phase doubling
    • C) No phase change
    • D) Reflection with energy loss
    • Answer: A

18. The principle of superposition states that:

    • A) Waves cancel each other out
    • B) Resultant displacement is the sum of individual displacements
    • C) Waves multiply their amplitudes
    • D) None of the above
    • Answer: B

19. Constructive interference occurs when the phase difference is:

    • A) $φ = π$
    • B) $φ = 2π$
    • C) $φ = π/2$
    • D) $φ = 3π/2$
    • Answer: B

20. Standing waves are formed due to:

    • A) Reflection
    • B) Interference of two waves in opposite directions
    • C) Refraction
    • D) Diffraction
    • Answer: B

---

Section 5: Applications and Phenomena

21. The beat frequency is equal to:

    • A) Sum of frequencies of two waves
    • B) Difference in frequencies of two waves
    • C) Product of frequencies of two waves
    • D) Average frequency of two waves
    • Answer: B

22. For a closed pipe, the fundamental frequency is:

    • A) $v/2L$
    • B) $v/4L$
    • C) $3v/4L$
    • D) $5v/4L$
    • Answer: B

23. The speed of sound in air increases with:

    • A) Pressure
    • B) Temperature
    • C) Humidity
    • D) Both B and C
    • Answer: D

24. The restoring force in longitudinal waves is related to:

    • A) Tension
    • B) Bulk modulus
    • C) Surface tension
    • D) Shear modulus
    • Answer: B

25. Beats are most distinct when:

• A) Frequencies are very close
• B) Frequencies are far apart
• C) Amplitudes differ greatly
• D) Waves are in phase
• Answer: A

---

Section 6: Wave Reflection and Standing Waves

26. At an open boundary, a reflected wave:

• A) Undergoes a phase change of π
• B) Undergoes no phase change
• C) Is completely absorbed
• D) Doubles in amplitude
• Answer: B

27. The nodes in a standing wave are points where:

• A) Displacement is maximum
• B) Displacement is zero
• C) Amplitude is maximum
• D) Frequency is zero
• Answer: B

28. The distance between two consecutive nodes in a stationary wave is:

• A) λ
• B) λ/2
• C) 2λ
• D) λ/4
• Answer: B

29. In a string fixed at both ends, the first harmonic frequency is given by:

• A) $v/4L$
• B) $v/2L$
• C) $3v/4L$
• D) $v/L$
• Answer: B

30. The superposition of two waves traveling in opposite directions produces:

• A) Progressive waves
• B) Longitudinal waves
• C) Standing waves
• D) Electromagnetic waves
• Answer: C

---

Section 7: Wave Motion in Different Media

31. The speed of a transverse wave on a stretched string depends on:

• A) Length of the string
• B) Tension and linear mass density
• C) Amplitude of the wave
• D) Frequency of the wave
• Answer: B

32. For sound waves in a medium, the speed is determined by:

• A) Young’s modulus and mass density
• B) Bulk modulus and density
• C) Surface tension and length
• D) Shear modulus and pressure
• Answer: B

33. The speed of sound in a metallic bar is given by:

• A) $\sqrt{B/ρ}$
• B) $\sqrt{Y/ρ}$
• C) $\sqrt{T/μ}$
• D) $\sqrt{γP/ρ}$
• Answer: B

34. For air, the speed of sound increases with:

• A) Increased density
• B) Increased pressure
• C) Increased humidity
• D) Decreased temperature
• Answer: C

35. Which of these factors does not affect the speed of sound in air?

• A) Pressure
• B) Temperature
• C) Humidity
• D) Density
• Answer: A

---

Section 8: Mathematical Properties of Waves

36. In a wave described by $y(x, t) = a \sin(kx - \omega t)$, the term $k$ represents:

• A) Wave speed
• B) Angular wave number
• C) Angular frequency
• D) Phase constant
• Answer: B

37. The equation $y(x, t) = a \sin(kx - \omega t)$ describes a:

• A) Stationary wave
• B) Progressive wave
• C) Transverse wave only
• D) Longitudinal wave only
• Answer: B

38. The frequency of a wave is inversely proportional to:

• A) Wavelength
• B) Amplitude
• C) Speed
• D) Wave number
• Answer: A

39. A progressive wave has a wavelength of 2 m and a frequency of 10 Hz. Its speed is:

• A) 5 m/s
• B) 20 m/s
• C) 10 m/s
• D) 2 m/s
• Answer: B

40. The phase difference between two points separated by $λ/4$ in a wave is:

• A) $π/2$
• B) $π$
• C) $3π/2$
• D) $2π$
• Answer: A

41. The term $T/μ$ in the formula $v = \sqrt{T/μ}$ for wave speed represents:

• A) Elastic force
• B) Restoring force per unit length
• C) Linear density of the medium
• D) Wave tension and mass density ratio
• Answer: D

---

Section 9: Beats and Resonance

42. The phenomenon of beats occurs when two waves have:

• A) The same frequency
• B) Slightly different frequencies
• C) Amplitudes in phase
• D) Equal wavelengths
• Answer: B

43. The beat frequency is given by:

• A) $ν_1 + ν_2$
• B) $ν_1 - ν_2$
• C) $ν_1 \times ν_2$
• D) $(ν_1 - ν_2)/2$
• Answer: B

44. For a pipe closed at one end, only:

• A) Odd harmonics are present
• B) Even harmonics are present
• C) All harmonics are present
• D) No harmonics are present
• Answer: A

45. The lowest frequency of a system is called:

• A) Second harmonic
• B) Third harmonic
• C) First harmonic
• D) Resonant frequency
• Answer: C

46. In resonance, the frequency of an external source matches:

• A) Wave speed
• B) Natural frequency of the system
• C) Amplitude of the wave
• D) Wavelength of the wave
• Answer: B

MCQs for NEET, JEE, IIT, NIT, CUET, CTET, and SSC Entrance Exams: Your Ultimate Preparation Guide

Are you preparing for competitive exams like NEET, JEE, IIT, NIT, CUET, CTET, or SSC? Multiple Choice Questions (MCQs) are a proven way to enhance your preparation strategy. These MCQs are designed to strengthen your concepts, boost problem-solving skills, and improve time management—key elements to ace any entrance exam.

Why MCQs Are Essential for Competitive Exams?

1. Concept Clarity: MCQs cover important topics, ensuring a deep understanding of fundamental concepts.
2. Time Management: Practicing MCQs improves speed and accuracy, essential for high-stakes exams.
3. Exam Pattern Familiarity: MCQs simulate the real exam pattern, helping you feel confident on the big day.

Benefits of Using These MCQs for NEET, JEE, IIT, and More

• Targeted Preparation: Specially curated MCQs focus on the specific syllabus of exams like NEET, JEE, and CUET, making your study focused and efficient.
• Wide Subject Coverage: Includes questions from Physics, Chemistry, Mathematics, Biology, and more.
• Boosts Competitive Edge: High-quality MCQs ensure you're ready to tackle even the trickiest questions.

Exams These MCQs Help With:

• NEET: For aspiring medical students.
• JEE & IIT: For engineering and technical aspirants.
• NIT Admissions: A stepping stone to prestigious National Institutes of Technology.
• CUET: Common University Entrance Test for undergraduate programs.
• CTET: A mandatory test for teachers.
• SSC: Government job aspirants preparing for SSC exams.

Pro Tips to Use MCQs Effectively:

1. Regular Practice: Dedicate time daily to solve topic-wise MCQs.
2. Review and Revise: Go through solutions and explanations to understand your mistakes.
3. Mock Tests: Attempt full-length MCQ tests to build exam stamina.

Get Started Now!

Our extensive MCQ collections are tailored to help you succeed in NEET, JEE, IIT, NIT, CUET, CTET, and SSC. Start practicing today and take a step closer to your dream career. Bookmark this page and share it with fellow aspirants.

Tags:

MCQs for NEET, JEE MCQs, IIT preparation, CUET questions, CTET practice, SSC MCQs, competitive exam tips, entrance exam success.

Make your preparation smarter, not harder. Let these MCQs guide your way to success!