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

In astronomy, redshift is used to determine ____.

star size

star temperature

the expansion of the universe

2 / 40

The Doppler Effect occurs for ____.

only light waves

only sound waves

all types of waves

3 / 40

Redshift indicates that an astronomical object is ____.

moving away

stationary

moving towards

4 / 40

The amount of Doppler shift depends on ____.

relative velocity

wave frequency

wave amplitude

5 / 40

The apparent change in frequency is due to ____.

absolute velocity

relative velocity

constant velocity

6 / 40

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

unchanged

higher

lower

7 / 40

The Doppler Effect helps in weather forecasting by ____.

measuring pressure

measuring wind speed

measuring temperature

8 / 40

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

increases

decreases

remains the same

9 / 40

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

shortened

lengthened

unchanged

10 / 40

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

amplitude increases

wavelength shortens

speed increases

11 / 40

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

frequency modulation

Doppler shift

amplitude shift

12 / 40

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

increases

stays the same

decreases

13 / 40

The Doppler Effect can be explained by ____.

wave theory

quantum theory

particle theory

14 / 40

The Doppler Effect can be observed with ____.

light waves

both sound and light

sound waves

15 / 40

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

𝑓′=𝑓f′=f

𝑓′=𝑓𝑣𝑣+𝑣𝑜f′=v+vo​fv​

𝑓′=𝑓𝑣𝑣−𝑣𝑜f′=v−vo​fv​

16 / 40

For an approaching sound source, the observed wavelength ____.

decreases

increases

remains constant

17 / 40

The frequency of a sound increases when the source ____.

recedes

approaches

remains stationary

18 / 40

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

increases

remains the same

decreases

19 / 40

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

relative speed

observer's mass

wave amplitude

20 / 40

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

highly variable

slower

faster

21 / 40

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

star size

star movements

star temperature

22 / 40

Doppler Effect is utilized in ____.

fluoroscopy

CAT scans

echocardiography

23 / 40

The Doppler Effect is used in ____.

air quality testing

medical diagnostics

soil analysis

24 / 40

Radar uses the Doppler Effect to measure ____.

temperature of objects

speed of objects

size of objects

25 / 40

Doppler Effect causes a change in ____.

wave speed

actual frequency

perceived frequency

26 / 40

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

relative motion

pressure change

temperature change

27 / 40

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

𝑓′=𝑓f′=f

𝑓′=𝑓(𝑣−𝑣𝑜)𝑣f′=vf(v−vo​)​

𝑓′=𝑓(𝑣+𝑣𝑜)𝑣f′=vf(v+vo​)​

28 / 40

In traffic speed enforcement, Doppler radar measures ____.

vehicle weight

vehicle speed

vehicle size

29 / 40

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

unpredictable

zero

maximum

30 / 40

The Doppler Effect can help determine ____.

distance

mass

velocity

31 / 40

The Doppler Effect is more significant in ____.

high-speed motion

static objects

low-speed motion

32 / 40

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

ultrasound

MRI

X-rays

33 / 40

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

unaffected

stretched

compressed

34 / 40

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

greater shift

constant shift

smaller shift

35 / 40

Blueshift indicates that an astronomical object is ____.

stationary

moving away

moving towards

36 / 40

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

𝑓′=𝑓f′=f

𝑓′=𝑓𝑣𝑣−𝑣𝑠f′=v−vs​fv​

𝑓′=𝑓𝑣𝑣+𝑣𝑠f′=v+vs​fv​

37 / 40

The speed of the source affects the ____.

sound direction

sound intensity

observed frequency

38 / 40

The Doppler Effect for light waves is known as ____.

phase shift

sound shift

redshift/blueshift

39 / 40

In the Doppler Effect, the wavelength ____.

is not affected

remains constant

changes

40 / 40

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

remains constant

always increases

changes periodically

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