Q. A wave traveling along a string has a frequency of 50 Hz and a wavelength of 2 m. What is the speed of the wave? (2020)
A.
25 m/s
B.
50 m/s
C.
100 m/s
D.
75 m/s
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Solution
Speed (v) = frequency (f) × wavelength (λ) = 50 Hz × 2 m = 100 m/s.
Correct Answer: C — 100 m/s
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Q. A wave traveling along a string is described by the equation y(x, t) = 0.1 sin(2π(0.5x - 2t)). What is the speed of the wave?
A.
1 m/s
B.
2 m/s
C.
3 m/s
D.
4 m/s
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Solution
The speed of the wave v is given by v = fλ. Here, f = 2 Hz and λ = 1 m (from the wave equation). Thus, v = 2 * 1 = 2 m/s.
Correct Answer: B — 2 m/s
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Q. A wave traveling along a string is described by the equation y(x, t) = 0.1 sin(2π(0.5x - 4t)). What is the wave speed?
A.
2 m/s
B.
4 m/s
C.
8 m/s
D.
1 m/s
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Solution
The wave speed v can be found from the equation v = fλ. Here, f = 4 Hz and λ = 2 m (from k = 2π/λ, k = 1 m⁻¹). Thus, v = 4 Hz * 2 m = 8 m/s.
Correct Answer: B — 4 m/s
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Q. A wave traveling along a string is described by the equation y(x, t) = A sin(kx - ωt). What does 'k' represent?
A.
Amplitude
B.
Wave number
C.
Frequency
D.
Angular frequency
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Solution
'k' is the wave number, which is related to the wavelength λ by the equation k = 2π/λ.
Correct Answer: B — Wave number
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Q. A wave traveling along a string is described by the equation y(x, t) = A sin(kx - ωt). What does 'A' represent?
A.
Wavelength
B.
Amplitude
C.
Frequency
D.
Speed
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Solution
'A' represents the amplitude of the wave, which is the maximum displacement from the equilibrium position.
Correct Answer: B — Amplitude
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Q. A wave traveling along a string is described by the equation y(x, t) = A sin(kx - ωt). What does the parameter A represent?
A.
Wavelength
B.
Amplitude
C.
Frequency
D.
Speed
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Solution
In the wave equation y(x, t) = A sin(kx - ωt), A represents the amplitude of the wave, which is the maximum displacement from the equilibrium position.
Correct Answer: B — Amplitude
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Q. A wave traveling along a string is described by the equation y(x, t) = A sin(kx - ωt). What is the phase velocity of the wave?
A.
A/k
B.
ω/k
C.
k/ω
D.
Aω
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Solution
The phase velocity v is given by v = ω/k.
Correct Answer: B — ω/k
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Q. A wave traveling along a string is described by the equation y(x, t) = A sin(kx - ωt). If A = 2 m, k = 3 rad/m, and ω = 6 rad/s, what is the amplitude of the wave?
A.
1 m
B.
2 m
C.
3 m
D.
4 m
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Solution
The amplitude of the wave is given directly by A in the wave equation. Here, A = 2 m.
Correct Answer: B — 2 m
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Q. A wave travels along a string with a speed of 300 m/s and has a frequency of 150 Hz. What is the wavelength of the wave?
A.
1.0 m
B.
2.0 m
C.
3.0 m
D.
4.0 m
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Solution
Wavelength λ is given by λ = v/f. Here, v = 300 m/s and f = 150 Hz. Thus, λ = 300/150 = 2.0 m.
Correct Answer: B — 2.0 m
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Q. A wave travels at a speed of 300 m/s and has a frequency of 150 Hz. What is its wavelength?
A.
2 m
B.
1.5 m
C.
3 m
D.
0.5 m
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Solution
The wavelength λ can be calculated using the formula v = fλ. Thus, λ = v/f = 300 m/s / 150 Hz = 2 m.
Correct Answer: B — 1.5 m
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Q. A wave travels in a medium with a speed of 300 m/s and has a frequency of 75 Hz. What is the wavelength? (2021)
A.
4 m
B.
2 m
C.
3 m
D.
1 m
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Solution
Wavelength λ = v/f = 300 m/s / 75 Hz = 4 m.
Correct Answer: A — 4 m
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Q. A wave travels through a medium with a frequency of 500 Hz and a wavelength of 2 m. What is the speed of the wave?
A.
1000 m/s
B.
250 m/s
C.
500 m/s
D.
2000 m/s
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Solution
The speed of a wave is given by the formula v = fλ, where f is the frequency and λ is the wavelength. Here, v = 500 Hz * 2 m = 1000 m/s.
Correct Answer: A — 1000 m/s
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Q. A wave travels through a medium with a speed of 300 m/s and has a frequency of 150 Hz. What is its wavelength?
A.
1 m
B.
2 m
C.
3 m
D.
4 m
Show solution
Solution
Wavelength (λ) can be calculated using the formula λ = v/f. Here, λ = 300 m/s / 150 Hz = 2 m.
Correct Answer: B — 2 m
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Q. A wave travels through a medium with a speed of 300 m/s and has a frequency of 150 Hz. What is the wavelength of the wave?
A.
1 m
B.
2 m
C.
3 m
D.
4 m
Show solution
Solution
The wavelength λ can be calculated using the formula v = fλ. Thus, λ = v/f = 300 m/s / 150 Hz = 2 m.
Correct Answer: B — 2 m
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Q. A wave travels through a medium with a speed of 300 m/s and has a frequency of 150 Hz. What is the wavelength?
A.
1 m
B.
2 m
C.
3 m
D.
4 m
Show solution
Solution
Wavelength λ = v/f = 300/150 = 2 m.
Correct Answer: B — 2 m
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Q. A wave travels through a medium with a speed of 500 m/s and has a wavelength of 2 m. What is its frequency? (2022)
A.
250 Hz
B.
500 Hz
C.
1000 Hz
D.
2000 Hz
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Solution
Using the wave equation v = fλ, we can find frequency f = v/λ = 500 m/s / 2 m = 250 Hz.
Correct Answer: A — 250 Hz
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Q. A wave travels through a medium with a speed of 500 m/s and has a wavelength of 5 m. What is its frequency? (2021)
A.
100 Hz
B.
50 Hz
C.
200 Hz
D.
250 Hz
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Solution
Frequency (f) = speed (v) / wavelength (λ) = 500 m/s / 5 m = 100 Hz.
Correct Answer: A — 100 Hz
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Q. A wave travels with a frequency of 500 Hz and a wavelength of 2 m. What is its speed?
A.
250 m/s
B.
1000 m/s
C.
500 m/s
D.
200 m/s
Show solution
Solution
The speed of the wave is given by v = fλ. Here, v = 500 Hz * 2 m = 1000 m/s.
Correct Answer: A — 250 m/s
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Q. A wave travels with a speed of 300 m/s and has a frequency of 150 Hz. What is its wavelength?
A.
1 m
B.
2 m
C.
3 m
D.
4 m
Show solution
Solution
Wavelength (λ) can be calculated using the formula λ = v/f. Here, λ = 300 m/s / 150 Hz = 2 m.
Correct Answer: B — 2 m
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Q. A wave travels with a speed of 300 m/s and has a frequency of 150 Hz. What is the wavelength? (2020)
A.
2 m
B.
1.5 m
C.
3 m
D.
0.5 m
Show solution
Solution
Wavelength (λ) = Speed (v) / Frequency (f) = 300 m/s / 150 Hz = 2 m.
Correct Answer: A — 2 m
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Q. A wave travels with a speed of 340 m/s and has a frequency of 170 Hz. What is its wavelength? (2022)
A.
2.0 m
B.
1.0 m
C.
0.5 m
D.
3.0 m
Show solution
Solution
Wavelength λ = v/f = 340 m/s / 170 Hz = 2.0 m.
Correct Answer: A — 2.0 m
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Q. A weight is measured as 10 kg with a relative error of 0.1. What is the absolute error?
A.
1 kg
B.
0.1 kg
C.
0.5 kg
D.
0.2 kg
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Solution
Absolute error = Relative error * True value = 0.1 * 10 = 1 kg.
Correct Answer: A — 1 kg
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Q. A weight is measured to be 50 kg with a possible error of 1 kg. What is the percentage error in the measurement?
A.
2%
B.
1%
C.
0.5%
D.
5%
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Solution
Percentage error = (Absolute error / Measured value) * 100 = (1 / 50) * 100 = 2%
Correct Answer: A — 2%
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Q. A wheel is rotating with an angular acceleration of 2 rad/s². If it starts from rest, what will be its angular velocity after 5 seconds? (2022)
A.
5 rad/s
B.
10 rad/s
C.
15 rad/s
D.
20 rad/s
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Solution
Using the formula ω = ω₀ + αt, where ω₀ = 0, α = 2 rad/s², and t = 5 s, we get ω = 0 + 2*5 = 10 rad/s.
Correct Answer: B — 10 rad/s
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Q. A wheel is rotating with an angular velocity of 10 rad/s. If it accelerates at 2 rad/s², what will be its angular velocity after 5 seconds? (2023)
A.
20 rad/s
B.
10 rad/s
C.
15 rad/s
D.
25 rad/s
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Solution
Using the formula ω = ω₀ + αt, we have ω = 10 rad/s + (2 rad/s²)(5 s) = 20 rad/s.
Correct Answer: A — 20 rad/s
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Q. A wheel is rotating with an angular velocity of 10 rad/s. If it accelerates at a rate of 2 rad/s², what will be its angular velocity after 5 seconds?
A.
20 rad/s
B.
10 rad/s
C.
30 rad/s
D.
0 rad/s
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Solution
Final angular velocity = initial angular velocity + (angular acceleration × time) = 10 + (2 × 5) = 20 rad/s.
Correct Answer: A — 20 rad/s
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Q. A wheel of radius 0.5 m is rotating with an angular speed of 10 rad/s. What is the linear speed of a point on the edge of the wheel? (2022)
A.
5 m/s
B.
10 m/s
C.
15 m/s
D.
20 m/s
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Solution
Linear speed v = rω = 0.5 m * 10 rad/s = 5 m/s.
Correct Answer: B — 10 m/s
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Q. A wheel of radius R and mass M is rolling without slipping on a horizontal surface. If it has a linear speed v, what is its total kinetic energy? (2022)
A.
(1/2)Mv²
B.
(1/2)Mv² + (1/2)(Iω²)
C.
(1/2)Mv² + (1/2)(Mv²)
D.
(1/2)Mv² + (1/2)(Mv²/2)
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Solution
The total kinetic energy is the sum of translational and rotational kinetic energy. K.E. = (1/2)Mv² + (1/2)(Iω²) where I = (1/2)MR² for a solid cylinder.
Correct Answer: B — (1/2)Mv² + (1/2)(Iω²)
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Q. A wheel of radius R is rolling without slipping on a horizontal surface. If the wheel has an angular velocity ω, what is the linear velocity of the center of the wheel? (2023)
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Solution
The linear velocity v of the center of the wheel is given by v = Rω.
Correct Answer: A — Rω
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Q. A wheel of radius R is rolling without slipping on a horizontal surface. What is the relationship between the linear velocity v of the center of the wheel and its angular velocity ω?
A.
v = Rω
B.
v = ω/R
C.
v = 2Rω
D.
v = ω/2R
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Solution
For rolling without slipping, the linear velocity v is related to angular velocity ω by the equation v = Rω.
Correct Answer: A — v = Rω
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