NEET Physics: Waves — MCQ Test 19

Q6. A pipe closed at one end has a length of 0.6 m and resonates at its second harmonic with a speed of sound of 360 m/s. What is the frequency?

Q7. A string fixed at both ends has a length of 1.8 m and a wave speed of 54 m/s. What is the frequency of its third harmonic?

Q8. A stationary wave on a string fixed at both ends has a frequency of 90 Hz and a wave speed of 36 m/s. What is the length of the string?

Q9. Two waves of frequencies 475 Hz and 480 Hz interfere. How many beats are heard in 20 seconds?

Q10. A transverse wave on a string has a speed of 18 m/s and a frequency of 6 Hz. What is its wavelength?

NEET Physics — Waves

Free MCQ Test 19 of 22

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Two waves of frequencies 480 Hz and 486 Hz interfere. How many beats are heard in 12 seconds?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Waves. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Frequencies, Interfere, Stationary, Distance, Antinode, and Frequency.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. Two waves of frequencies 480 Hz and 486 Hz interfere. How many beats are heard in 12 seconds?

  • A. 60
  • B. 66
  • C. 72
  • D. 78

Q2. A stationary wave is given by \( y = 0.05 \sin (\frac{\pi x}{2}) \cos (100\pi t) \), where \( x \) and \( y \) are in meters and \( t \) in seconds. What is the distance between a node and the next antinode?

  • A. 0.5 m
  • B. 2 m
  • C. 1.5 m
  • D. 1 m

Q3. A pipe closed at one end has a length of 0.4 m and a speed of sound of 320 m/s. What is the frequency of its fundamental mode?

  • A. 200 Hz
  • B. 150 Hz
  • C. 250 Hz
  • D. 300 Hz

Q4. When two waves interfere constructively, what happens to the resultant intensity if their amplitudes are equal?

  • A. It doubles
  • B. It triples
  • C. It quadruples
  • D. It remains the same

Q5. The speed of sound in air at STP is calculated using Newton’s formula as 280 m/s. If the actual speed is 331 m/s, what is the value of \( \gamma \) (ratio of specific heats) for air?

  • A. 1.2
  • B. 1.4
  • C. 1.6
  • D. 1.8

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