Q1. If the amplitude of a wave is tripled, what happens to the energy carried by the wave? (2019)
Solution:
The energy carried by a wave is proportional to the square of the amplitude. Therefore, if the amplitude is tripled, the energy increases by a factor of 3^2 = 9.
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Q2. Which of the following phenomena is NOT associated with waves? (2023)
Solution:
Conduction is a mode of heat transfer and is not associated with wave phenomena.
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Q3. What is the relationship between frequency and period of a wave? (2020)
Solution:
The frequency (f) of a wave is the reciprocal of the period (T), given by the formula f = 1/T.
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Q4. Which of the following waves requires a medium for propagation? (2022)
Solution:
Sound waves require a medium (solid, liquid, or gas) for propagation, while electromagnetic waves do not.
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Q5. If the amplitude of a wave is increased, what effect does it have on the energy of the wave? (2022)
Solution:
The energy of a wave is proportional to the square of its amplitude. Therefore, if the amplitude increases, the energy also increases.
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Q6. What type of wave is characterized by particle motion being parallel to wave motion? (2023)
Solution:
In a longitudinal wave, the particle motion is parallel to the direction of wave propagation.
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Q7. Which of the following statements is true about sound waves? (2023)
Solution:
Sound waves require a medium (solid, liquid, or gas) to travel and cannot propagate through a vacuum.
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Q8. In a standing wave, what are the points called where there is no displacement? (2020)
Solution:
In a standing wave, the points where there is no displacement are called nodes.
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Q9. If a wave has a frequency of 50 Hz and a wavelength of 3 m, what is its speed? (2019)
Solution:
Wave speed (v) can be calculated using the formula v = fλ. Here, v = 50 Hz * 3 m = 150 m/s.
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Q10. A wave has a frequency of 50 Hz and a wavelength of 2 m. What is the speed of the wave? (2021)
Solution:
The speed of a wave is given by the formula v = fλ. Here, v = 50 Hz * 2 m = 100 m/s.
