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

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

lengthened

shortened

unchanged

2 / 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′=𝑓(𝑣+𝑣𝑜)𝑣f′=vf(v+vo​)​

𝑓′=𝑓f′=f

3 / 40

The frequency of a sound increases when the source ____.

approaches

recedes

remains stationary

4 / 40

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

amplitude increases

wavelength shortens

speed increases

5 / 40

Doppler Effect causes a change in ____.

perceived frequency

wave speed

actual frequency

6 / 40

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

frequency modulation

amplitude shift

Doppler shift

7 / 40

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

ultrasound

MRI

X-rays

8 / 40

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

lower

higher

unchanged

9 / 40

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

remains constant

changes periodically

always increases

10 / 40

The speed of the source affects the ____.

observed frequency

sound direction

sound intensity

11 / 40

The Doppler Effect can help determine ____.

velocity

distance

mass

12 / 40

The Doppler Effect is more significant in ____.

low-speed motion

high-speed motion

static objects

13 / 40

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

zero

unpredictable

maximum

14 / 40

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

relative motion

pressure change

temperature change

15 / 40

The Doppler Effect occurs for ____.

only light waves

only sound waves

all types of waves

16 / 40

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

relative speed

wave amplitude

observer's mass

17 / 40

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

stays the same

increases

decreases

18 / 40

The apparent change in frequency is due to ____.

constant velocity

absolute velocity

relative velocity

19 / 40

Radar uses the Doppler Effect to measure ____.

temperature of objects

speed of objects

size of objects

20 / 40

The Doppler Effect is used in ____.

air quality testing

soil analysis

medical diagnostics

21 / 40

The Doppler Effect can be explained by ____.

quantum theory

particle theory

wave theory

22 / 40

Blueshift indicates that an astronomical object is ____.

stationary

moving away

moving towards

23 / 40

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

constant shift

smaller shift

greater shift

24 / 40

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

𝑓′=𝑓𝑣𝑣−𝑣𝑠f′=v−vs​fv​

𝑓′=𝑓𝑣𝑣+𝑣𝑠f′=v+vs​fv​

𝑓′=𝑓f′=f

25 / 40

Redshift indicates that an astronomical object is ____.

stationary

moving away

moving towards

26 / 40

The Doppler Effect for light waves is known as ____.

redshift/blueshift

sound shift

phase shift

27 / 40

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

𝑓′=𝑓𝑣𝑣−𝑣𝑜f′=v−vo​fv​

𝑓′=𝑓𝑣𝑣+𝑣𝑜f′=v+vo​fv​

𝑓′=𝑓f′=f

28 / 40

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

remains the same

decreases

increases

29 / 40

In traffic speed enforcement, Doppler radar measures ____.

vehicle speed

vehicle weight

vehicle size

30 / 40

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

stretched

compressed

unaffected

31 / 40

The Doppler Effect helps in weather forecasting by ____.

measuring wind speed

measuring pressure

measuring temperature

32 / 40

Doppler Effect is utilized in ____.

CAT scans

echocardiography

fluoroscopy

33 / 40

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

increases

remains the same

decreases

34 / 40

The Doppler Effect can be observed with ____.

light waves

both sound and light

sound waves

35 / 40

In astronomy, redshift is used to determine ____.

star temperature

star size

the expansion of the universe

36 / 40

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

faster

slower

highly variable

37 / 40

In the Doppler Effect, the wavelength ____.

is not affected

changes

remains constant

38 / 40

For an approaching sound source, the observed wavelength ____.

decreases

increases

remains constant

39 / 40

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

star temperature

star movements

star size

40 / 40

The amount of Doppler shift depends on ____.

wave frequency

relative velocity

wave amplitude

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