Free Waves MCQs with Answers
1,281 Waves MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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- A. 12 Hz and 24 Hz
- B. 8 Hz and 14 Hz
- C. 10 Hz and 20 Hz
- D. 66 Hz and 11 Hz
Explanation: Number of beats n= fb-fa [frequencies of tuning forks] So, fb-fa= 6We have to find the option where the difference of two frequencies is…
Correct answer: 8 Hz and 14 Hz- A. Multiple wavelength
- B. Double wavelength
- C. Single wavelength
- D. Coherent photons
Explanation: The sources that produce waves having the same frequency, equal or comparable amplitude, and a constant phase difference are called…
Correct answer: Single wavelength- A. 320 * 4
- B. 320 / 4
- C. 320+4
- D. 320
Explanation: On loading the first one, the number of beats increases. Therefore, the frequency of the tuning fork must be 324 Hz.
Correct answer: 320+41164. Beats can be used for:
- A. Counting the heart beat
- B. Tuning a string instrument
- C. Measuring frequency of pendulum
- D. None of above
Explanation: Beats are used in tuning musical instruments.
Correct answer: Tuning a string instrument- A. The width of central maximum is decreased
- B. The width of outer maximum is decreased
- C. The intensity of the central maximum will decrease
- D. Less number of fringes will be observed
Explanation: Option D is correct since there will be fewer fringes on the screen since one slit is covered and no light coming from it.
Correct answer: Less number of fringes will be observed- A. Increases
- B. Decreases
- C. Remains the same
- D. None of these options are correct
Explanation: Recall the double slit equation: x = λD/a where x is the fringe separation, D is the distance between the double slit and the screen, a is…
Correct answer: Increases- A. 2.7 ms-1
- B. 3 ms-1
- C. 200 ms-1
- D. 2 ms-1
Explanation: Number of waves passing through a certain point in 1 second = 40 waves The wavelength of the wave (λ)= cm Find:Wave speed.
Correct answer: 2 ms-1- A. 2.7 m/s
- B. 3 m/s
- C. 200 m/s
- D. 2 m/s
Explanation: The formula for the speed of a wave is v=fλ Since 40 waves pass through a certain point in one second, the frequency of the wave is 40 Hz.
Correct answer: 2 m/s- A. 1 ms-1
- B. 2 ms-1
- C. 3 ms-1
- D. 4 ms-1
Explanation: Frequency=100, Wavelength= 1cm = 1/100 = 0.01m. Frequency = Speed/Wavelength (Frequency) (Wavelength) =Speed (100)(0.01)=1m/s.
Correct answer: 1 ms-1- A. Frequency
- B. Wavelength
- C. Amplitude
- D. Time period
Explanation: The wavelength (λ) is the total distance travelled by the wave in one full cycle.
Correct answer: Wavelength- A. 33 Hz
- B. 330 Hz
- C. 3300 Hz
- D. 33000 Hz
Explanation: Speed of sound in air = 330m/s Wavelength = 10 cm = 0.1 m Frequency = speed of sound / wavelength Frequency = 330/0.1 = 3300 Hz Thus…
Correct answer: 3300 Hz- A. Speed = frequency * wavelength
- B. Speed * frequency= wavelength
- C. Speed =frequency/ wavelength
- D. Speed =frequency+ wavelength
Explanation: Wave speed is related to wavelength and wave frequency by the equation: Speed = Wavelength x Frequency.
Correct answer: Speed = frequency * wavelength- A. 300 m/s
- B. 150 m/s
- C. 300 cm/s
- D. 150 cm/s
Explanation: For wavelength, According to the formula of Phase Difference = 2 / where, = phase difference ( phase angle between two points ) =…
Correct answer: 150 m/s- A. 300 m/s
- B. 150 m/s
- C. 300 cm/s
- D. 150 cm/s
Explanation: B is correct.Phase difference = 2pi/λ x Path differenceΔϕ = 2π/λ x Δxπ/3 = 2πf/v x 0.05 (v=fλ)π/3 = 2π(500)/ v x 0.05v= 150m/s
Correct answer: 150 m/s- A. 1 m/s
- B. 10 cm/s
- C. 2 m/s
- D. 40 cm/s
Explanation: The speed of a wave is given by the product of its frequency and wavelength.
Correct answer: 1 m/s- A. 40 Hz
- B. 1/5 Hz
- C. 5 Hz
- D. 500 Hz
Explanation: Option C is correct since the wavelength of the wave is 10 cm and speed is 50 cm/s. Since V=Frequency x wavelength , F= 50/10 = 5hz
Correct answer: 5 Hz- A. 40 Hz
- B. 1/5 Hz
- C. 5 Hz
- D. 500 Hz
Explanation: The equation is given by:v = f \λOn rearranging the equation for frequency, we get,f = v/λPutting values:f = (50 cm/s)/10 cmf = 5 Hz
Correct answer: 5 Hz- A. Wavelength decreases, speed does not change
- B. Wavelength increases, speed does not change
- C. Wavelength increases, speed increases
- D. Wavelength increases, speed decreases
Explanation: If a source producing waves moves away from the observer at a constant speed, then the observed wavelength will be larger than the…
Correct answer: Wavelength increases, speed does not change- A. 20/3 m
- B. 20x3 m
- C. 3/20 m
- D. 2/3 m
Explanation: Wavelength formula: v/f λ = 300/2000 λ = 3/20 m Hence, option C is correct.
Correct answer: 3/20 m- A. 42.5 Hz
- B. 85 Hz
- C. 220 Hz
- D. None of these
Explanation: The speed of the sound is = 340m/sIn an open pipe , the length of the pipe contains half a wavelength which means L= λ/2.Using the…
Correct answer: 85 Hz