Chapter 8 waves of 11th class physics Fedral board of islamabad.
Chapter 8: Waves - Key Topics
Below are 10 Multiple Choice Questions (MCQs) with answers and brief explanations, specifically from Chapter 8: Waves of the FBISE (Federal Board of Intermediate and Secondary Education) 11th-class Physics syllabus for the 2025 exam. These MCQs are designed to align with the FBISE syllabus, focusing on key concepts such as types of waves, wave properties, superposition, Doppler effect, and stationary waves, as outlined in the official curriculum and reflected in past papers and resources like www.taleemcity.com and www.ilmistarsacademy.com. They are crafted to match the style and difficulty level of FBISE exams.
Chapter 8: Waves - Key Topics
- Types of Waves: Transverse and longitudinal, mechanical and electromagnetic.
- Wave Properties: Wavelength, frequency, speed, amplitude.
- Superposition: Interference, beats, stationary waves.
- Doppler Effect: Apparent frequency changes due to relative motion.
- Stationary Waves: Nodes, antinodes, applications (e.g., in strings and pipes).
10 MCQs with Answers and Explanations
- Question: A wave in which particles of the medium vibrate perpendicular to the direction of wave propagation is called:
- A) Longitudinal wave
- B) Transverse wave
- C) Electromagnetic wave
- D) Sound wave
- Answer: B) Transverse wave
- Explanation: Transverse waves have particle vibrations perpendicular to the wave’s direction (e.g., waves on a string), unlike longitudinal waves.
- Question: The speed of a wave is given by:
- A) v = f/λ
- B) v = fλ
- C) v = λ/f
- D) v = f²λ
- Answer: B) v = fλ
- Explanation: Wave speed v = frequency (f) × wavelength (λ), a fundamental relationship for all waves.
- Question: A wave has a frequency of 10 Hz and a wavelength of 2 m. Its speed is:
- A) 5 m/s
- B) 10 m/s
- C) 20 m/s
- D) 40 m/s
- Answer: C) 20 m/s
- Explanation: Speed v = fλ = 10 × 2 = 20 m/s.
- Question: The phenomenon of beats is caused by:
- A) Diffraction
- B) Refraction
- C) Interference
- D) Polarization
- Answer: C) Interference
- Explanation: Beats occur due to the interference of two waves with slightly different frequencies, producing variations in amplitude.
- Question: In a stationary wave, the distance between two consecutive nodes is:
- A) λ
- B) λ/2
- C) λ/4
- D) 2λ
- Answer: B) λ/2
- Explanation: In a stationary wave, nodes are points of zero displacement, spaced λ/2 apart (half the wavelength).
- Question: The Doppler effect is observed when:
- A) The source and observer are stationary
- B) The source and observer move relative to each other
- C) The medium is at rest
- D) The wave speed is constant
- Answer: B) The source and observer move relative to each other
- Explanation: The Doppler effect causes a change in observed frequency due to the relative motion between source and observer.
- Question: A sound source moves toward a stationary observer. The observed frequency:
- A) Decreases
- B) Increases
- C) Remains the same
- D) Becomes zero
- Answer: B) Increases
- Explanation: When the source moves toward the observer, the apparent frequency increases (Doppler effect: f’ = f(v/(v - v_s)), where v_s is source speed).
- Question: The fundamental frequency of a stretched string is proportional to:
- A) Length of the string
- B) Square of tension
- C) Square root of tension
- D) Mass of the string
- Answer: C) Square root of tension
- Explanation: Fundamental frequency f = (1/2L)√(T/μ), where T is tension and μ is mass per unit length, so f ∝ √T.
- Question: In a closed organ pipe, the fundamental frequency corresponds to:
- A) λ = L
- B) λ = 2L
- C) λ = 4L
- D) λ = L/2
- Answer: C) λ = 4L
- Explanation: For a closed organ pipe, the fundamental mode has a node at the closed end and an antinode at the open end, with λ = 4L (quarter wavelength fits in the pipe length L).
- Question: Constructive interference occurs when the path difference between two waves is:
- A) λ/2
- B) λ
- C) 3λ/4
- D) λ/4
- Answer: B) λ
- Explanation: Constructive interference occurs when the path difference is an integral multiple of the wavelength (nλ, where n = 0, 1, 2, …), with λ being a common case.
Key Notes
- Syllabus Alignment: These MCQs cover core topics from Chapter 8 (Waves) of the FBISE 11th-class Physics syllabus, including wave properties, superposition, Doppler effect, and stationary waves, which are frequently tested in exams.
- Question Variety: The questions include conceptual, numerical, and application-based MCQs to reflect FBISE’s exam pattern, with emphasis on wave equations and phenomena like interference.
- Explanations: Brief explanations clarify the reasoning, aiding quick understanding and revision.
Recommended Resources for Additional MCQs
For more MCQs on Chapter 8 (Waves):
- FBISE Official Website (www.fbise.edu.pk):
- Access past papers (2016–2024) under “Examinations” > “Past Papers.” Chapter 8 MCQs appear in the objective section.
- Taleem City (www.taleemcity.com):
- Offers solved MCQs for Chapter 8 in PDF format, tailored for FBISE syllabus.
- Ilmi Stars Academy (www.ilmistarsacademy.com):
- Provides chapter-specific MCQs with answers and video explanations.
- Download Class Notes (www.downloadclassnotes.com):
- Contains solved MCQs for Waves in downloadable PDFs.
- Pak Learning Spot (www.paklearningspot.com):
- Features free MCQs for FBISE board exams, including Chapter 8.
How to Access:
- Visit these websites, navigate to the 11th-class Physics section, and select “Chapter 8 MCQs” or “Waves.”
- Past papers are available on the FBISE website in PDF format, free of charge.
Tips for MCQ Preparation
- Focused Practice: Solve 10–15 MCQs daily for Chapter 8 to master concepts like the Doppler effect and stationary waves.
- Time Yourself: Aim for ~1 minute per MCQ to build exam speed.
- Review Errors: Use answer keys to understand mistakes and revisit concepts like interference or wave speed.
- Combine with Numericals: Pair MCQ practice with numerical problems (e.g., wave speed, frequency of strings) from the FBISE textbook (available on www.taleem360.com).
Additional Support
These 10 MCQs are tailored to support your preparation for the 2025 FBISE exam. If you need:
- More MCQs for Chapter 8 (Waves).
- MCQs for other chapters or specific topics (e.g., Doppler effect, stationary waves).
- Assistance downloading resources or solving numericals. please let me know, and I’ll provide further tailored support. Good luck with your Physics exam preparation!
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