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 23 of 65
- A. Due to the reaction between the car and ground
- B. Due to rolling frictional force between tyre and road
- C. By the gravitational force
- D. Due to lack of sufficient centripetal force
Explanation: Fact: When an object takes a turn two forces come to act.Centripetal forceCentrifugal forceCentripetal force acts inward (towards the…
Correct answer: Due to lack of sufficient centripetal force- A. 4π2/9 N
- B. 40π2/9 N
- C. 100π2/9 N
- D. 400π2/9 N
Explanation: Resultant force, F = mrω2 = mr(2π/T)2 = 2 × 5 × (2π/3)2 = 40π2/9 N After evaluating, we find that the correct answer is option B) 40π2/9…
Correct answer: 40π2/9 N- A. Velocity
- B. Acceleration
- C. Centripetal force
- D. Kinetic energy
Explanation: As K.E depends upon magnitude of velocity i.e. speed. In a horizontal circle as speed is constant so K.E remains constant.The correct…
Correct answer: Kinetic energy- A. 3 π rad s-2
- B. 9 π rad s-2
- C. 6 π rad s-2
- D. 12 π rad s-2
Explanation: α = Δω/Δt ω = (540 x 2π)/60 = 18 π α = 18π / 6 = 3π rads-2
Correct answer: 3 π rad s-2- A. 3 N
- B. 13 N
- C. 15 N
- D. 18 N
Explanation: Tention = mω2r - mg (where m = mass, ω = angular velocity, r = radius) Tention = (0.5 x 42 x 1) - (0.5 x 10) Tention = (0.5 x 16) - 5 = 8…
Correct answer: 3 N- A. Circular motion
- B. Uniform circular motion
- C. Uniform circular motion with fixed axis of rotation
- D. Uniform circular motion with axis of rotation not defined
Explanation: Uniform circular motion with fixed axis of rotation: It correctly describes the motion of the particle to be circular; as it remains at a…
Correct answer: Uniform circular motion with fixed axis of rotation- A. 2 rad s-1
- B. 6 rad s-1
- C. 4 rad s-1
- D. 8 rad s-1
Explanation: Convert 1600 cm/s into m/s = 1600/ 100 = 16m/s ω = v/r (radius = diameter/2 = 4/2 = 2m) ω = 16 / 2 = 8 rads-1
Correct answer: 8 rad s-1- A. 2π rad/s
- B. 4π2 rad/s
- C. 4π rad/s
- D. π rad/s
Explanation: 120 rev/ min =120 x 2π / 60 rad/sec =4π rad / sec
Correct answer: 4π rad/s- A. Velocity and acceleration are perpendicular to each other
- B. Velocity and acceleration are parallel to each other
- C. Velocity and acceleration are anti-parallel
- D. Both have zero magnitude
Explanation: The velocity of an object in circular motion is always tangent to the circle, while the acceleration is always directed toward the center…
Correct answer: Velocity and acceleration are perpendicular to each other- A. 1 : 1
- B. 2 : 3
- C. 3 : 2
- D. 1 : 6
Explanation: All the points on rotating body have same angular acceleration.
Correct answer: 1 : 1- A. 8 rad/s2
- B. 16 rad/s2
- C. 10 m/s2
- D. 10 rad/s2
Explanation: a = rα where a = tangential acceleration, r = radius, α = angular acceleration Radius = diameter/2 = 2/2 = 1m α = a/r = 8/1 = 8 rad/s2
Correct answer: 8 rad/s2452. When a wheel, 1m in diameter, makes 30 rev/min, the linear speed of point on its rim in ms-1 is:
- A. 2π
- B. 3π
- C. π/2
- D. 4π
Explanation: First find the value of angular speed in rad/s ω = (30 x 2π) / 60 = π V = ω x r = π x 0.5 = π/2 (radius = diameter/2 = 1/2 = 0.5m)
Correct answer: π/2- A. 2π
- B. π/6
- C. 4π
- D. π/12
Explanation: Angular velocity for one complete rotation (Earth completes one complete rotation in 24 hours) θ = 360 = 2π ω = θ/t = 2π/24 = π/12
Correct answer: π/12- A. Reduced
- B. Half
- C. Maximum
- D. Zero
Explanation: Explanation is given below: The work done due to the centripetal force in circular motion is zero.
Correct answer: Zero- A. rω
- B. vω
- C. v/r
- D. v/r2
Explanation: V = ωr Vω = (ω r) x ω = ω2r The formula for acceleration is also; acceleration = ω2r, as this option equates to this formula it is correct.
Correct answer: vω456. The force which provides the necessary centripetal force to keep the mud in circular path is called:
- A. Cohesive force
- B. Frictional force
- C. Adhesive force
- D. Gravitational force
Explanation: When an object moves in a circular path, it experiences an inward force called centripetal force.
Correct answer: Frictional force- A. Bottom point B
- B. Point C
- C. Point D
- D. Top point A
Explanation: The tension in the cord is greatest (mv^2/r) at the bottom of the circle.
Correct answer: Bottom point B- A. Toward the centre of circle
- B. Along the tangent
- C. Away from centre of circle
- D. All of these
Explanation: The stone will move along the tangent if the string breaks.The reason for this is that the stone's velocity is tangent to the circle at…
Correct answer: Along the tangent- A. parallel to the moving tyre
- B. tangent to the moving tyre
- C. anti parallel to the moving tyre
- D. none of these
Explanation: The mud flies off the tyre of a fast moving car in the tangential direction.The reason for this is that the mud is subjected to a…
Correct answer: tangent to the moving tyre- A. B
- B. D
- C. A
- D. C
Explanation: The resultant force acting on the Moon at the instant shown is (A) towards the center of the Earth.The Moon is in a circular orbit around…
Correct answer: A