NEET Physics: phase Practice Questions
14 free multiple-choice questions on phase (Oscillations and Waves) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. If two waves are perfectly in phase, what is the phase difference (Δφ) between them?
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Correct answer: A — 0 radians
When two waves are perfectly in phase, it means their crests and troughs align exactly, resulting in a phase difference of zero radians (or 0).
Q2. The phase velocity of a wave is defined as the speed at which:
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Correct answer: B — The phase of the wave propagates
Phase velocity is the speed at which the phase (or crests/troughs) of a wave propagates through space.
Q3. The phase of a simple harmonic motion (SHM) described by x = A sin(ωt + φ) at time t=0 is given by:
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Correct answer: A — 0
When the phase is defined as φ, the equation is x = A sin(ωt + φ). At t=0, the position is x = A sin(φ). If the phase is defined such that x=0 at t=0, then φ=0 is the simplest starting point, implying the motion starts at the equilibrium position moving in the positive direction.
Q4. The phase of a wave is often measured in terms of which unit?
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Correct answer: C — Radian
Phase is a measure of the state of oscillation and is typically measured in radians or degrees, representing the angular position on the waveform cycle.
Q5. What is the phase difference between two points on a single traveling wave?
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Correct answer: D — 0 radians
In a single traveling wave, the phase difference between any two points is generally dependent on the spatial separation and wavelength. For identical points separated by λ/2, the phase difference is π radians (or 180°).
Q6. In simple harmonic motion (SHM), the phase of the oscillator is directly proportional to which of the following parameters?
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Correct answer: B — Angular frequency
The phase of an oscillator is fundamentally related to the angular frequency (ω) and time (t). For a fixed amplitude, the phase is dependent on the time elapsed, which is directly related to the angular frequency of oscillation.
Q7. The mathematical expression for a general sinusoidal wave is often written as y = A sin(ωt + φ). What does the term φ represent in this equation?
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Correct answer: D — Phase
In the equation y = A sin(ωt + φ), φ represents the phase constant, which determines the initial phase or the position of the waveform at time t=0.
Q8. The phase difference between two waves is defined as the difference in their spatial or temporal position. What quantity represents this difference?
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Correct answer: B — Phase difference
Phase difference is the essential concept quantifying the relative shift or difference in the position of two waves (or points on a wave) at a given time or location.
Q9. In wave interference, constructive interference occurs when the phase difference between the waves is equal to:
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Correct answer: B — 0 radians
Constructive interference happens when the waves are perfectly in phase, meaning their phase difference is an integer multiple of 2π (or zero, for the fundamental case). If the phase difference is 0, the waves are perfectly aligned in phase.
Q10. When two waves interfere, the condition for total constructive interference requires the phase difference between them to be:
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Correct answer: B — 0 or 2nπ radians
For total constructive interference, the waves must be perfectly in phase, meaning their phase difference must be an integer multiple of 2π (i.e., 0, 2π, 4π, …).
Q11. If two oscillations start from the same position and have the same frequency, the phase difference between them is:
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Correct answer: D — Zero
If two oscillations start from the same position and have the same frequency, they are perfectly in sync, meaning their initial phase difference is zero.
Q12. For two waves with angular frequencies ω₁ and ω₂, the relationship between their phase difference and the time interval t is given by Δφ= (ω₂ - ω₁) t. If the waves have the same frequency (ω₁ = ω₂) and a time interval t, what is the phase difference?
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Correct answer: C — 0
If the angular frequencies are the same (ω₁ = ω₂), the difference (ω₂ - ω₁) is zero, hence the phase difference Δφ is zero, regardless of the time t.
Q13. Consider two waves propagating in the same direction. If the phase difference between them is π radians, what is the relationship between their spatial positions (assuming equal wavelength)?
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Correct answer: B — They are perfectly out of phase
A phase difference of π radians corresponds to the waves being exactly opposite to each other in terms of their relative position on the wave cycle, meaning they are perfectly out of phase.
Q14. In wave mechanics, the phase of a wave describes the position of a point in the wave's cycle. If two waves of the same frequency travel in the same direction, and their phase difference is π radians, what is the relationship between them?
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Correct answer: D — They are anti-phase (or 180° out of phase).
A phase difference of π radians (or 180°) signifies that the two waves are exactly anti-phase. This means that when one wave is at its maximum, the other is at its minimum, which is the condition for perfect destructive interference if they have the same amplitude.
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