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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1,281 questions · page 21 of 65
- A. Upward
- B. Downward
- C. Away from us
- D. Towards us
Explanation: When the pedestal fan is switched off, then its angular velocity and acceleration are anti parallel to each other.
Correct answer: Away from us- A. 2π rad s-1
- B. π/1800 rad s-1
- C. π/30 rad s-1
- D. 3600π rad s-1
Explanation: ωm = 2π/3600 rad/s = π/1800 rad/s (minute hand complete 1 revolution in 1 hour)
Correct answer: π/1800 rad s-1- A. Angular speed is slow
- B. Axis of rotation is fixed
- C. Mass of body is very light
- D. Both "A" and "B"
Explanation: When axis of rotation is fixed then all angular vectors have the same direction. Hence they can be manipulated as scalars.
Correct answer: Axis of rotation is fixed- A. If angular velocity is increased
- B. If angular velocity is decreased
- C. If radius is decreased
- D. Both "A" and "B"
Explanation: Angular work is being done When external torque acts on the body that changes the angular velocity (either increase or decrease).
Correct answer: Both "A" and "B"- A. Constantly varying
- B. Fixed
- C. Along the x-axis
- D. Not stable
Explanation: The angular equations holds true only in the case when axis of rotation is fixed. So, that angular vectors have the same direction.
Correct answer: Fixed- A. Base quantity
- B. Supplementary quantity
- C. Vector quantity
- D. Scalar quantity
Explanation: For very small values ∆θ, the angular displacement is a vector quantity, its direction is along the axis of rotation and it is given by…
Correct answer: Vector quantity- A. I,II, III
- B. III, I, III
- C. ll, lll, I
- D. III, II, I
Explanation: Earth completes one rotation in 24 hours Hour hand completes one rotation in 12 hours Second hand completes one rotation in 1 minute…
Correct answer: I,II, III- A. 0°
- B. 90°
- C. 180°
- D. 360°
Explanation: "ac" is directed towards the center of circle while "α" is directed along the axis of rotation
Correct answer: 90°- A. 6 revolutions
- B. 8 revolutions
- C. 2 revolutions
- D. 10 revolutions
Explanation: θ = ωit + -2αt2 = (3)(2) + 1/2(1)(2)2= 6+ 2= 8 rev
Correct answer: 8 revolutions- A. By rockets
- B. Due to gravitational pull of Earth
- C. Due to their high mass
- D. Due to inertia
Explanation: Satellites are the objects which are orbiting around the earth at different heights from the surface of Earth.
Correct answer: Due to gravitational pull of Earth- A. 0
- B. 2 J
- C. 1 J
- D. 4 J
Explanation: W =Fc .dW= Fcd cosθ = Fcd cos90° = Fd (0) = 0Due to centripetal force the object will move in a circular path.
Correct answer: 0- A. Zero
- B. 19.8 J
- C. 4.9 J
- D. 9.8 J
Explanation: No work done in circular motion due to centripetal force.
Correct answer: Zero- A. 3π/2 radians
- B. π/2 radians
- C. 2π/3 radians
- D. 5π/2 radians
Explanation: Option C is correct.The angle between hour and minute hand at 1'O clock = 2π/12 radThe angle between hour and minute hand at 4'O clock = 4…
Correct answer: 2π/3 radians- A. Micro waves
- B. Ultravoilet rays
- C. Infrared waves
- D. Cosmic waves
Explanation: Option A is correct.Microwave signals are used for satellite telecommunications.
Correct answer: Micro waves- A. 2π rad/s
- B. 2π/15 rad/s
- C. π rad/s
- D. 4π rad/s
Explanation: Option B is correct.Given data :4 rev/min Solution:4 rev/min = 4 x 2π/60 = 2π/15 rad/s
Correct answer: 2π/15 rad/s- A. 240π meters
- B. 2π meters
- C. 80π meters
- D. 80 meters
Explanation: Option D is correct.An athlete complete 1 round in 40 s. it means that 3 rounds complete 120s (2 minutes), so total displacement is zero…
Correct answer: 80 meters- A. 5 ms-1
- B. 20 ms-1
- C. 100 ms-1
- D. 0.5 ms-1
Explanation: Option B is correct.Given data: r=2m, w=10rad/sfind out:vt=?solution:vt = rω = (2)(10) = 20 m/s
Correct answer: 20 ms-1- A. Unequal arms are equal
- B. Equal arms are equal
- C. Unequal arms are unequal
- D. None of these
Explanation: Option D is correct.Two isosceles triangles are similar if an angle of one is congruent to the corresponding angle of the other.No, two…
Correct answer: None of these- A. Displacement
- B. Velocity
- C. Acceleration
- D. All of these
Explanation: Option D is correct.1.We know that: S= rθ Hence,For a body moving in a circle, its linear displacement is equal to radius times angular…
Correct answer: All of these- A. 2 x 10^3N
- B. 1 x 10^4N
- C. .2 x 10^4N
- D. 0.5 x 10^4N
Explanation: Option B is correct.Given data: m=1000kg , v=10ms-1, r=10mFind out:Fc=?Solution:We know that:Fc=mv2/r = 1000(10)2/10 =1 x 104N
Correct answer: 1 x 10^4N