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571
A body attached to a spring is pulled to a distance of 20 cm. If the value of spring constant is 48 N m^-1, the amount of force applied will be
A. 4.8 N
B. 192 N
C. 9.6 N
D. 96 N
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Correct Option
Explanation
Force = kx = 48 N/m × 0.20 m = 9.6 N.
572
Which of the following is the difference between stationary (standing) and progressive (traveling) waves?
A. amplitude
B. propagation of energy
C. frequency
D. phase of the wave
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Correct Option
Explanation
Progressive waves transport energy through the medium, whereas standing waves do not transfer net energy along the medium.
573
Waves transport
A. Momentum
B. Energy
C. Matter
D. Particles
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Correct Option
Explanation
Waves transmit energy through the medium or space without transporting the medium itself, so option C is correct.
574
If a wave vibrates 10 times in 1 s with a speed of 10 m s^-1, the correct wavelength of the wave is
A. 10 m
B. 100 m
C. 20 m
D. 1 m
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Correct Option
Explanation
Frequency = 10 Hz, speed = 10 m/s, so wavelength = v/f = 10/10 = 1 m.
575
If the tension of a stretched string is made four times then the velocity of wave:
A. Remains same
B. Is halved
C. Becomes 4 times
D. Becomes twice
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Correct Option
Explanation
OCR marks option C; wave speed on a string ∝ √tension, so quadrupling tension doubles the speed, option C.
576
A body of mass 5 g is executing simple harmonic motion about a point O with an amplitude of 10 cm. Its maximum velocity is 100 cm/s. Its velocity will be 50 cm/s at a distance
A. 5/2 cm
B. 10√2 cm
C. 5√3 cm
D. 5 cm
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Correct Option
Explanation
For SHM v = vmax sqrt(1 - x^2/A^2); with v/vmax = 1/2, x = A·√3/2 = 10·√3/2 = 5√3 cm.
577
The instantaneous velocity of a body executing SHM is maximum when the phase of vibration is
A. 45°
B. 135°
C. 0°
D. 90°
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Correct Option
Explanation
Velocity v = ωA cos φ is maximum when cos φ = ±1, i.e., φ = 0° (subject to sign), corresponding to the mean position.
578
Waves in which the medium particles vibrate in a direction at right angle to the direction of propagation of waves are called ____.
A. Longitudinal waves
B. Transverse waves
C. Compressional waves
D. Stationary waves
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Correct Option
Explanation
In transverse waves particle motion is perpendicular (at right angles) to the direction of wave propagation.
579
Which of the following quantities associated with SHM does not vary periodically?
A. Total energy
B. Displacement
C. Velocity
D. Acceleration
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Correct Option
Explanation
In ideal SHM total mechanical energy remains constant (does not vary periodically), while velocity, displacement and acceleration vary periodically.
580
The Nobel Prize was awarded for the experimental confirmation of wave nature of particles to:
A. Germer and G. P Thomson
B. Germer and de Broglie
C. Davisson and G.P Thomson
D. Davisson and Germer
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Correct Option
Explanation
The Nobel Prize for experimental confirmation of the wave nature of electrons was awarded to Clinton Davisson and G. P. Thomson, matching option C.
