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Complete Mechanical Waves objective questions from basic to toughest JEE Advanced level.
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Objective Questions – Page 7 (High Difficulty)
Q61️⃣ (Concept + Logic)
For a transverse wave on a stretched string, the restoring force arises due to:
- A) Gravity
- B) Elasticity of string
- C) Tension in string
- D) Air resistance
Answer: C
Q62️⃣ (Numerical – Wave Equation)
A wave is represented by:
y = A sin(2πt − πx)
The wavelength of the wave is:
- A) 1 m
- B) 2 m
- C) 4 m
- D) π m
Answer: B
Logic: k = π ⇒ λ = 2π/k = 2 m
Q63️⃣ (Multi-Correct – Reflection)
Reflection of sound waves is used in:
- A) SONAR
- B) Stethoscope
- C) Echo
- D) Radar
Correct Options: A, B, C
Q64️⃣ (Numerical – String Tension)
If tension in a stretched string is increased four times, the speed of transverse wave becomes:
- A) Double
- B) Half
- C) Four times
- D) Same
Answer: A
Formula: v ∝ √T
Q65️⃣ (Standing Waves – Tricky)
In a standing wave:
- A) Energy is transmitted
- B) Net energy flow is zero
- C) Nodes oscillate with max amplitude
- D) Antinodes remain stationary
Answer: B
Q66️⃣ (Numerical – Beats)
Two sources produce beats of frequency 6 Hz. If one source has frequency 420 Hz, the possible frequencies of other source are:
- A) 414 Hz
- B) 426 Hz
- C) 432 Hz
- D) 420 Hz
Correct Options: A, B
Q67️⃣ (Doppler Effect – Concept)
If source approaches observer but observer moves away, the observed frequency:
- A) Always increases
- B) Always decreases
- C) Depends on relative speeds
- D) Becomes zero
Answer: C
Q68️⃣ (Organ Pipe – Advanced)
An open organ pipe has fundamental frequency 300 Hz. Its second harmonic frequency is:
- A) 300 Hz
- B) 450 Hz
- C) 600 Hz
- D) 900 Hz
Answer: C
Q69️⃣ (Very Tricky)
Which wave property decides pitch of sound?
- A) Amplitude
- B) Frequency
- C) Speed
- D) Wavelength
Answer: B
Q70️⃣ (Interference – JEE Advanced)
If path difference between two waves is λ/2, the interference produced is:
- A) Constructive
- B) Destructive
- C) No interference
- D) Beats
Answer: B
✅ Objective Page 7 Completed
Level: ⭐⭐⭐⭐⭐ (Very High)
👉 Say Objective Page 8 to continue
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