Waves MCQ: Definition and Concept

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Waves are the transfer or flow of energy from one place to another with the transfer of particles or molecules. Sound waves show in the form of oscillations when they pass through water waves or sound waves. Their presence can be in both visible and invisible forms. There are various kinds of waves such as waves on a string, water waves, sound waves, seismic waves, etc. Matter waves involve electrons, protons, neutrons, atoms, and molecules.

Ques 1. Infrasonic sound is produced by which of the following?

Bats
Elephant
Tiger
Cockroach

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Ans. b) Elephant

Explanation: frequency can be divided into 3 classes -:

Audible Sound Waves

The range of this wave is 20Hz – 20,000 Hz
This type of wave can be detected by humans.

Ultrasonic Waves

The range of this wave is more than 20,000Hz
Humans cannot notice the ultrasound waves.

Infrasonic Waves

The range of this wave is less than 20,000 Hz
Humans cannot notice it as well.

After this research, we have found that infrasonic sound is produced by elephants.

Elephants have the genetics to communicate by using very low-frequency sound with noise below the range of human hearing.

Ques 2. Which wave is used in MRI machine?

Acoustic wave
Infrasonic wave
X-ray
Magnetic Wave

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Ans. d) Magnetic Wave

Explanation:

X rays and ionizing radiation are not involved in MRI. It is distinguished with CT Scan, PET scan, etc.
MRI scanners function with the help of magnetic field gradients and radio waves to bring forth images of the organ.

Ques 3. Sound waves cannot pass through ________ ?

Vacuum
Liquid
Radiation
Solid

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Ans. a) Vacuum

Explanation:

The sound wave cannot pass through the vacuum. It is a sphere without any air.
Sound wave is a mechanical wave because of which sound cannot pass or travel through a medium, and no kind of vibrations can work in it, that’s why it can’t travel or pass through a vacuum.
Sound waves can pass through solid, liquid, and gas.

Ques 4. What kind of wave is a light wave?

Longitudinal Wave
ransverse Wave
None of the above
Both A & B

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Ans. b) Transverse Wave

Explanation: There are 2 types of waves in the following chapter

Longitudinal Wave - “ if the particles of the medium vibrate in the direction of propagation of the wave, the wave is known as Longitudinal wave.”

Ex – Wave on springs.

Transverse Wave – “if the particles of the medium vibrate perpendicular to the direction of propagation of a wave, it is known as a transverse wave.

Ex- Wave on the surface of the water."

Ques 5. ______________ light has the lowest wavelength.

Green
Red
Violet
Pink

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Ans. c) Violet

Explanation:

Direction of the wavelength is measured
Spectrum of visible light has various colors with different wavelengths.
The wavelength is longer and the frequency is lower and, vice versa, the wavelength is shorter and the frequency is higher.

Ques 6. (5mm) sin [(1 cm -1) x – ( 60s-1)t]. Calculate the wave number.

2 cm-1
15 cm-1
1 cm-1
20 cm-1

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Ans. c) 1 cm-1

Explanation:

y =(5mm) sin [( 1 cm-1) x- (60s-1)t]

= y = A sin (kx – wt = y = (5mm) sin [(1cm-1)x – (60s-1)t]

= K = 1cm-1

Ques 7. How can we measure the speed of sound?

Metre/sound
Hours
Millimeter
Joule

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Ans. a) Metre/sound

Explanation: Speed = distance/time

The speed of sound is described as the distance traveled per unit of time by any sound.
The dynamic propagation of sound waves defines the speed of sound.
The speed of sound is used in various fields in physics.
The speed of sound waves is described in an elastic medium

Ques 8. Which wave has the minimum distance between two points having the same phase?

Amplitude
Decibel
Frequency of the wave
Wavelength of the wave

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Ans. d) Wavelength of the wave

Explanation: It signifies the wavelength sign and is measured in meters.

Ques 9. Which wave moves from one point of medium to another?

Progressive waves
Transverse waves
Horizontal wave
Air

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Ans. a) Progressive waves

Explanation:

A wave that can travel constantly in a medium in the same direction without any change in its amplitude is known as a progressive wave.
Progressive waves are also known as traveling waves.
Ex – when the bell rings and vibrates, the waves never return.

Ques 10. Longitudinal waves need elasticity?

Shear modulus of elasticity
Bulk modulus of elasticity
Young modulus of elasticity
All of the above

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Ans. b) bulk modulus of elasticity

Explanation:

When the longitudinal sound waves are in solid existence with a velocity and wave impedance which is dependent on the material’s density and its rigidity.
It is described by the material’s bulk modulus.

Ques 11. Essential properties which a medium must possess for the propagation of mechanical waves?

Maximum friction
Minimum friction
Stabilization
Constant temperature

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Ans. b) Minimum friction

Explanation: the friction force amongst the matter of the medium should be insignificantly small, they continue oscillating for a long time and the wave travels a long distance through the medium.

Also read:

Mechanical Properties of Solids	Shear Modulus
Difference Between Force and Pressure	Hooke’s Law
Young's Modulus	Poisson’s Ratio
Stress	Elastic Limit

CBSE CLASS XII Related Questions

1.
Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Both Assertion (A) and Reason (R) are false.

View Solution

2.
Four long straight thin wires are held vertically at the corners A, B, C and D of a square of side \( a \), kept on a table and carry equal current \( I \). The wire at A carries current in upward direction whereas the current in the remaining wires flows in downward direction. The net magnetic field at the centre of the square will have the magnitude:

\( \dfrac{\mu_0 I}{\pi a} \) and directed along OC
\( \dfrac{\mu_0 I}{\pi a \sqrt{2}} \) and directed along OD
\( \dfrac{\mu_0 I \sqrt{2}}{\pi a} \) and directed along OB
\( \dfrac{2\mu_0 I}{\pi a} \) and directed along OA

View Solution

3.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

attract with a force \( \frac{F}{2} \)
repel with a force \( \frac{F}{2} \)
repel with a force \( F \)
attract with a force \( F \)

View Solution

4.
The electric potential (V ) and electric field (⃗ E) are closely related concepts in electrostatics. The electric field is a vector quantity that represents the

Production of AC is economical.
AC can be easily and efficiently converted from one voltage to another.
AC can be transmitted economically over long distances.
AC is less dangerous.

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5.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60° in 0.2 s. The value of emf induced in the loop will be:

5 V
3.5 V
2.5 V
Zero V

View Solution

6.
The magnetic field in a plane electromagnetic wave travelling in glass (\( n = 1.5 \)) is given by \[ B_y = (2 \times 10^{-7} \text{ T}) \sin(\alpha x + 1.5 \times 10^{11} t) \] where \( x \) is in metres and \( t \) is in seconds. The value of \( \alpha \) is:

\( 0.5 \times 10^3 \, \text{m}^{-1} \)
\( 6.0 \times 10^2 \, \text{m}^{-1} \)
\( 7.5 \times 10^2 \, \text{m}^{-1} \)
\( 1.5 \times 10^3 \, \text{m}^{-1} \)

View Solution

Waves MCQ: Definition and Concept

CBSE CLASS XII Related Questions

1.
Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

3.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

4.
The electric potential (V ) and electric field (⃗ E) are closely related concepts in electrostatics. The electric field is a vector quantity that represents the

5.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60° in 0.2 s. The value of emf induced in the loop will be:

6.
The magnetic field in a plane electromagnetic wave travelling in glass (\( n = 1.5 \)) is given by \[ B_y = (2 \times 10^{-7} \text{ T}) \sin(\alpha x + 1.5 \times 10^{11} t) \] where \( x \) is in metres and \( t \) is in seconds. The value of \( \alpha \) is:

Similar Physics Concepts

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Waves MCQ: Definition and Concept

CBSE CLASS XII Related Questions

1.Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

3.Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

4.The electric potential (V ) and electric field (⃗ E) are closely related concepts in electrostatics. The electric field is a vector quantity that represents the

5.A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60° in 0.2 s. The value of emf induced in the loop will be:

6.The magnetic field in a plane electromagnetic wave travelling in glass (\( n = 1.5 \)) is given by \[ B_y = (2 \times 10^{-7} \text{ T}) \sin(\alpha x + 1.5 \times 10^{11} t) \] where \( x \) is in metres and \( t \) is in seconds. The value of \( \alpha \) is:

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

3.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

4.
The electric potential (V ) and electric field (⃗ E) are closely related concepts in electrostatics. The electric field is a vector quantity that represents the

5.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60° in 0.2 s. The value of emf induced in the loop will be:

6.
The magnetic field in a plane electromagnetic wave travelling in glass (\( n = 1.5 \)) is given by \[ B_y = (2 \times 10^{-7} \text{ T}) \sin(\alpha x + 1.5 \times 10^{11} t) \] where \( x \) is in metres and \( t \) is in seconds. The value of \( \alpha \) is: