Wave Motion and Types of Waves for Competitive Exams

Wave Motion and Types of Waves

Q. In simple harmonic motion, what is the relationship between the displacement and the restoring force?

Solution

In simple harmonic motion, the restoring force is directly proportional to the displacement and acts in the opposite direction.

Correct Answer: A — Directly proportional

Q. What is the condition for constructive interference of two waves?

Solution

Constructive interference occurs when the path difference between two waves is an even multiple of the wavelength.

Correct Answer: B — Path difference is an even multiple of the wavelength

Q. What is the focal length of a converging lens if it forms a real image at a distance of 30 cm from the lens when the object is placed at 60 cm?

Solution

Using the lens formula (1/f = 1/v - 1/u), we find f = 1/(1/30 - 1/60) = 20 cm.

Correct Answer: B — 20 cm

Q. Which of the following is a characteristic of longitudinal waves?

Solution

In longitudinal waves, particles of the medium move parallel to the direction of wave propagation.

Correct Answer: B — Particles move parallel to wave direction

Q. Which type of polarization occurs when waves vibrate in a single plane?

Solution

Linear polarization occurs when waves vibrate in a single plane.

Correct Answer: B — Linear polarization

Q. Which type of wave requires a medium for propagation?

Solution

Sound waves are mechanical waves that require a medium (solid, liquid, or gas) to propagate.

Correct Answer: B — Sound waves

Q. Which type of wave requires a medium to travel through?

Solution

Sound waves are mechanical waves that require a medium (solid, liquid, or gas) to propagate.

Correct Answer: B — Sound waves

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