Physics 11th Chap 9 : Topic 7 - Maryam Publications

Physics Chapter 9 : Topic 7

Superposition of Waves

1 / 30

The principle of superposition states that when two or more waves overlap, the resultant displacement is:

A) Always zero

B) The sum of individual displacements

C) The product of individual displacements

D) The difference of frequencies only

2 / 30

The principle of superposition is applicable when waves:

A) Have equal amplitudes only

B) Destroy each other completely

C) Overlap in the same medium

D) Have the same frequency only

3 / 30

If two waves produce displacements of $\mathbf{+ \ 3\ cm}$ and $\mathbf{+ \ 5\ cm}$ at the same point, the resultant displacement is:

A) $\mathbf{15\ cm}$

B) $\mathbf{8\ cm}$

C) $\mathbf{2\ cm}$

D) $\mathbf{0\ cm}$

4 / 30

If two waves produce displacements of $\mathbf{+ \ 6\ cm}$ and $\mathbf{- \ 4\ cm}$ at a point, the resultant displacement is:

A) $\mathbf{- \ 2\ cm}$

B) $\mathbf{2\ cm}$

C) $\mathbf{- \ 10\ cm}$

D) $\mathbf{10\ cm}$

5 / 30

Superposition of waves explains the formation of:

A) Interference patterns

B) Refraction only

C) Polarization only

D) Reflection only

6 / 30

Constructive interference occurs when two waves have:

A) Different frequencies only

B) Same phase

C) Opposite phases

D) Zero amplitudes

7 / 30

Destructive interference occurs when two waves have a phase difference of:

A) $\mathbf{180}^{\mathbf{o}}$

B) $\mathbf{90}^{\mathbf{o}}$

C) $\mathbf{0}^{\mathbf{o}}$

D) $\mathbf{45}^{\mathbf{o}}$

8 / 30

Two waves of equal amplitude produce complete destructive interference when:

A) Their frequencies are different.

B) Their amplitudes are equal and phases differ by $\mathbf{180}^{\mathbf{o}}$.

C) They travel in the same direction with same phase.

D) Their wavelengths are zero.

9 / 30

In constructive interference, the resultant amplitude is:

A) Less than individual amplitudes

B) Equal to zero

C) Greater than individual amplitudes

D) Always unchanged

10 / 30

In destructive interference, the resultant amplitude:

A) Becomes infinite

B) Always doubles

C) Decreases

D) Increases

11 / 30

Two waves have amplitudes $\mathbf{4\ cm\ }$and $\mathbf{6\ cm}$. The maximum possible resultantamplitude is:

A) $\mathbf{12\ cm}$

B) $\mathbf{10\ cm}$

C) $\mathbf{2\ cm}$

D) $\mathbf{24\ cm}$

12 / 30

Two waves have amplitudes $\mathbf{8\ cm}$ and $\mathbf{5\ cm}$. The minimum possible resultant amplitude is:

A) $\mathbf{0\ cm}$

B) $\mathbf{3\ cm}$

C) $\mathbf{40\ cm}$

D) $\mathbf{13\ cm}$

13 / 30

Two waves with amplitudes $\mathbf{5\ cm}$ and $\mathbf{5\ cm}$ meet in opposite phases. The resultant amplitude is:

A) $\mathbf{25\ cm}$

B) $\mathbf{5\ cm}$

C) $\mathbf{10\ cm}$

D) $\mathbf{0\ cm}$

14 / 30

Two waves overlap at a point. Their displacements are $\mathbf{7\ cm}$ and $\mathbf{- \ 9\ cm}$. Theresultant displacement is:

A) $\mathbf{- \ 16\ cm}$

B) $\mathbf{16\ cm}$

C) $\mathbf{2\ cm}$

D) $\mathbf{- \ 2\ cm}$

15 / 30

A wave with displacement $\mathbf{10\ cm}$ combines with another wave havingdisplacement $\mathbf{10\ cm}$ in the same direction. The resultant displacement is:

A) $\mathbf{20\ cm}$

B) $\mathbf{10\ cm}$

C) $\mathbf{100\ cm}$

D) $\mathbf{0\ cm}$

16 / 30

Two waves are in phase when their phase difference is:

A) $\mathbf{0}^{\mathbf{o}}$

B) $\mathbf{180}^{\mathbf{o}}$

C) $\mathbf{90}^{\mathbf{o}}$

D) $\mathbf{270}^{\mathbf{o}}$

17 / 30

Two waves are completely out of phase when their phase difference is:

A) $\mathbf{180}^{\mathbf{o}}$

B) $\mathbf{0}^{\mathbf{o}}$

C) $\mathbf{360}^{\mathbf{o}}$

D) $\mathbf{90}^{\mathbf{o}}$

18 / 30

If two waves have the same amplitude and frequency but opposite phases, they produce:

A) No displacement

B) Increased frequency

C) Increased wavelength

D) Maximum amplitude

19 / 30

The resultant displacement depends on:

A) Amplitude and phase relationship

B) Only amplitude

C) Only frequency

D) Only wavelength

20 / 30

When waves overlap, each wave:

A) Continues to travel independently

B) Stops existing

C) Loses all energy

D) Changes its frequency

21 / 30

Beats are produced due to:

A) Polarization of waves

B) Superposition of waves with slightly different frequencies

C) Reflection of waves

D) Absorption of waves

22 / 30

Noise-cancelling headphones work mainly due to:

A) Constructive interference

B) Destructive interference

C) Reflection

D) Refraction

23 / 30

The colors seen in thin films are due to:

A) Change in speed only

B) Sound reflection

C) Superposition and interference of light waves

D) Polarization only

24 / 30

The bright regions in an interference pattern are caused by:

A) Diffraction only

B) Constructive interference

C) Destructive interference

D) Absorption

25 / 30

The dark regions in an interference pattern are caused by:

A) Destructive interference

B) Increased frequency

C) Constructive interference

D) Maximum amplitude

26 / 30

If two waves meet and the resultant amplitude is greater than both individual amplitudes, the interference is:

A) Random

B) Impossible

C) Constructive

D) Destructive

27 / 30

The principle of superposition applies because waves:

A) Always cancel each other

B) Can pass through each other without permanent change

C) Lose energy during overlap

D) Cannot occupy the same space

28 / 30

A wave has amplitude $\mathbf{12\ cm}$ and another has amplitude $\mathbf{7\ cm}$. The resultant amplitude cannot be:

A) $\mathbf{12\ }\mathbf{cm}$

B) $\mathbf{5\ cm}$

C) $\mathbf{19\ cm}$

D) $\mathbf{25\ cm}$

29 / 30

When two waves of equal amplitude interfere constructively, the intensity becomes:

A) Four times the intensity of one wave

B) Zero

C) Half

D) Unchanged

30 / 30

The principle of superposition is important because it explains:

A) Only reflection

B) Only wave speed

C) Only polarization

D) Interference and formation of wave patterns

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