Doppler Effect MCQs with Answers

Welcome to the Doppler Effect MCQs with Answers. In this post, we have shared Doppler Effect Online Test for different competitive exams. Find practice Doppler Effect Practice Questions with answers in Physics Tests exams here. Each question offers a chance to enhance your knowledge regarding Doppler Effect.

Doppler Effect Online Quiz

By presenting 3 options to choose from, Doppler Effect Quiz which cover a wide range of topics and levels of difficulty, making them adaptable to various learning objectives and preferences. You will have to read all the given answers of Doppler Effect Questions and Answers and click over the correct answer.

• Test Name: Doppler Effect MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Doppler Effect

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1 / 40

The Doppler Effect for light waves is known as ____.

redshift/blueshift

phase shift

sound shift

2 / 40

The Doppler Effect is more significant in ____.

low-speed motion

high-speed motion

static objects

3 / 40

When a source of sound moves in a circle around an observer, the frequency ____.

always increases

remains constant

changes periodically

4 / 40

When the observer moves towards a stationary sound source, the frequency ____.

stays the same

decreases

increases

5 / 40

A higher speed of the source relative to the observer results in a ____.

greater shift

constant shift

smaller shift

6 / 40

For an approaching sound source, the observed wavelength ____.

increases

decreases

remains constant

7 / 40

The Doppler Effect is observed when there is a change in frequency due to ____.

pressure change

temperature change

relative motion

8 / 40

Radar uses the Doppler Effect to measure ____.

temperature of objects

size of objects

speed of objects

9 / 40

The change in frequency due to the Doppler Effect is called ____.

amplitude shift

frequency modulation

Doppler shift

10 / 40

The Doppler Effect can help determine ____.

mass

velocity

distance

11 / 40

If both the source and observer are moving towards each other, the observed frequency ____.

remains the same

decreases

increases

12 / 40

Blueshift indicates that an astronomical object is ____.

moving towards

stationary

moving away

13 / 40

In the Doppler Effect, if the wave source is moving towards the observer, the wavelength is ____.

unchanged

shortened

lengthened

14 / 40

The amount of Doppler shift depends on ____.

relative velocity

wave amplitude

wave frequency

15 / 40

The frequency of a sound increases when the source ____.

approaches

recedes

remains stationary

16 / 40

If the observer moves at the same speed as the source, the Doppler shift is ____.

maximum

unpredictable

zero

17 / 40

The Doppler Effect is used in ____.

soil analysis

air quality testing

medical diagnostics

18 / 40

The shift in frequency of a wave due to the Doppler Effect depends on ____.

wave amplitude

observer's mass

relative speed

19 / 40

Doppler Effect is less noticeable if the speed of the source is ____.

highly variable

faster

slower

20 / 40

The Doppler Effect can be explained by ____.

particle theory

wave theory

quantum theory

21 / 40

If an ambulance moves away from you, the pitch of its siren appears ____.

lower

unchanged

higher

22 / 40

The Doppler Effect can be observed with ____.

both sound and light

light waves

sound waves

23 / 40

The pitch of the sound heard from a moving source is higher because ____.

wavelength shortens

amplitude increases

speed increases

24 / 40

The apparent change in frequency is due to ____.

absolute velocity

relative velocity

constant velocity

25 / 40

The Doppler Effect occurs for ____.

only light waves

only sound waves

all types of waves

26 / 40

In traffic speed enforcement, Doppler radar measures ____.

vehicle size

vehicle speed

vehicle weight

27 / 40

In medical imaging, the Doppler Effect is used in ____.

ultrasound

MRI

X-rays

28 / 40

The formula for observed frequency when the observer is moving towards a stationary source is ____.

𝑓′=𝑓(𝑣+𝑣𝑜)𝑣f′=vf(v+vo​)​

𝑓′=𝑓f′=f

𝑓′=𝑓(𝑣−𝑣𝑜)𝑣f′=vf(v−vo​)​

29 / 40

In the Doppler Effect, the wavelength ____.

changes

is not affected

remains constant

30 / 40

The Doppler Effect helps in weather forecasting by ____.

measuring temperature

measuring pressure

measuring wind speed

31 / 40

If a sound source moves towards you, the sound waves get ____.

unaffected

stretched

compressed

32 / 40

Doppler Effect is utilized in ____.

fluoroscopy

CAT scans

echocardiography

33 / 40

Redshift indicates that an astronomical object is ____.

stationary

moving away

moving towards

34 / 40

In astronomy, redshift is used to determine ____.

star size

the expansion of the universe

star temperature

35 / 40

When the source of sound moves away from the observer, the observed frequency ____.

decreases

remains the same

increases

36 / 40

In astronomy, the Doppler Effect is used to determine ____.

star temperature

star size

star movements

37 / 40

The frequency of a wave for an observer moving away from the source is given by ____.

𝑓′=𝑓𝑣𝑣−𝑣𝑜f′=v−vo​fv​

𝑓′=𝑓f′=f

𝑓′=𝑓𝑣𝑣+𝑣𝑜f′=v+vo​fv​

38 / 40

The formula for observed frequency when the source is moving towards a stationary observer is ____.

𝑓′=𝑓𝑣𝑣−𝑣𝑠f′=v−vs​fv​

𝑓′=𝑓f′=f

𝑓′=𝑓𝑣𝑣+𝑣𝑠f′=v+vs​fv​

39 / 40

The speed of the source affects the ____.

sound intensity

observed frequency

sound direction

40 / 40

Doppler Effect causes a change in ____.

actual frequency

wave speed

perceived frequency

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