# Class 11th Physics – 15 Waves MCQs

#### Which of the following occurs during propagation of a longitudinal wave?

Correct! Wrong!

Both compression and rarefaction takes place during the propagation of a longitudinal wave.

#### Mechanical waves can be ____.

Correct! Wrong!

Mechanical waves can be either transverse or longitudinal.

#### In the expression for a progressive wave y(x, t) = a sin(kx − ωt + ), "" is ____.

Correct! Wrong!

In the expression for a progressive wave y(x, t) = a sin(kx − ωt + ), "" is initial phase.

#### When two waves, one incident and the other reflected of the same are superposed, the amplitude of the resultant wave changes with ____.

Correct! Wrong!

When two waves, one incident and the other reflected of the same are superposed, the amplitude of the resultant wave changes with position.

#### In a longitudinal wave, the particles of the medium vibrate in a direction ____ to the direction of wave propagation.

Correct! Wrong!

In a longitudinal wave, the particles of the medium vibrate in a direction parallel to the direction of wave propagation.

#### The speed of a transverse wave in a stretched string is independent of ____.

Correct! Wrong!

The speed of a transverse wave in a stretched string is independent of frequency of the wave.

#### Two waves having equal amplitude “a”, angular frequency and which are in phase propagating in the same direction superpose each other. The amplitude of the resultant wave is ____.

Correct! Wrong!

The amplitude of the resultant wave formed by the superposition of the given waves is “2a”.

#### The speed of a transverse wave in a stretched string depends on ____.

Correct! Wrong!

The speed of a transverse wave in a stretched string depends on both tension and mass per unit length of the string

#### Two waves given by the expressions y1(x, t) = a sin (kx −ωt) and y2(x, t) = a sin(kx + ωt) superpose each other. The amplitude of the resultant wave depends on ____.

Correct! Wrong!

The expression for the resultant wave formed by the superposition of the given waves is obtained as y(x, t) = (2a sin kx) cos ωt. Thus the resultant amplitude depends on the position “x”.

#### When a sound wave propagates in air, the pressure in air is highest at ____.

Correct! Wrong!

When a sound wave propagates in air, the pressure in air is highest at the points of maximum compression.

#### Addition of wave forms or pulses to find the net or resultant wave form is called the principle of ____.

Correct! Wrong!

Addition of wave forms or pulses to find the net or resultant wave form is called the principle of superposition.

#### The distance between two particles in a string, in which a transverse wave is set, is 24 cm. If the phase difference between the two particles is 540°, what is the wavelength of the wave?

Correct! Wrong!

Given the phase difference between the points is 540°
The distance between the two points in the string, l = 24 cm
Hence, the path difference between the two points in the string =540/360×λ
= 1.5λ
= 24 cm
⇒λ=24/1.5
= 16 cm

#### In a transverse wave, the particles of the medium vibrate in a direction _____ to the direction of wave propagation.

Correct! Wrong!

In a transverse wave, the particles of the medium vibrate in a direction perpendicular to the direction of wave propagation.

#### When a wave is incident on the boundary separating two elastic media, which of the following follows Snell’s law?

Correct! Wrong!

When a wave is incident on the boundary separating two elastic media; the refracted part of the wave follows Snell’s law.

#### When a wave propagates, particles of the medium vibrate about a mean position with ____.

Correct! Wrong!

When a wave propagates, particles of the medium vibrate about a mean position with simple harmonic motion.

#### In which of the following is the speed of sound highest?

Correct! Wrong!

Speed of sound is highest in solids, compared to liquids and gases. Hence, speed of sound is highest in aluminium.

#### Which of the following represents the reflection of y = a sin (kx − ωt) from a rigid boundary?

Correct! Wrong!

y = a sin (kx + ωt) represents the reflection of the given wave at a rigid boundary.

#### When a pebble is thrown into a still water pond ____.

Correct! Wrong!

When a pebble is thrown into a still water pond ripples formed move from one place to another.

#### Waves carry along with them a certain amount of ____ and information in the form of ____.

Correct! Wrong!

Waves carry along with them a certain amount of energy and information in the form of signals.

#### The properties of a string that determines the speed of a wave in it are ____.

Correct! Wrong!

Both mass per unit length and elasticity of a string determines the speed of a transverse wave set up in the string.

#### The distance between any two consecutive nodes in a stationary wave is ____.

Correct! Wrong!

The distance between any two consecutive nodes in a stationary wave is half the wavelength.

#### When two pulses travel along a string in opposite direction along a string, the net displacement of any element of the string as the two pulses cross each other is: (i) The geometric sum of the displacements due to each pulse (ii) The algebraic sum of the displacements due to each pulse.

Correct! Wrong!

When two pulses travel along a string in opposite direction along a string, the net displacement of any element of the string as the two pulses cross each other is the geometric sum of the displacements due to each pulse.

#### The ripples formed in a still water pond by throwing a pebble into it: (i) move outward (ii) move inward.

Correct! Wrong!

The ripples formed in a still water pond by throwing a pebble into it move outward as the energy propagates away from the source.

#### Sound waves in air are __ waves.

Correct! Wrong!

Sound waves in air are longitudinal waves.

#### Which of the following parameters are considered for finding the displacement of a particle in a progressive wave?

Correct! Wrong!

Amplitude, propagation constant, angular frequency and initial phase are the four parameters considered for finding the displacement of a particle in a progressive wave.

#### Which of the following need a material medium for their propagation?

Correct! Wrong!

Mechanical waves require a medium for their propagation.

#### If a wave is incident on a boundary that is not rigid and separates two elastic media, then the wave gets ____.

Correct! Wrong!

If a wave is incident on a boundary that is not rigid and separates two elastic media, and then the wave gets partly reflected and partly refracted.

#### The positions in a stretched string, in which a standing wave is formed, where the amplitude is zero are called ____.

Correct! Wrong!

The positions in a stretched string, in which a standing wave is formed, where the amplitude is zero are called nodes.

#### In the expression for a progressive wave y(x, t) = a sin(kx −ωt + ), "k" is ____.

Correct! Wrong!

In the expression for a progressive wave y(x, t) = a sin(kx ωt + ), "k" is propagation constant.

Class 11th Physics - 15 Waves MCQs
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