General Science - Physics
Welcome to General Science – Physics MCQ series of GKToday. As of today February 26, 2020, this series has 590 Questions. You may purchase a PDF E-Book compilation comprising all these questions and their answers with explanation from this link.
51. What is the oscillation in which the loss of oscillator is compensated by the supplying energy from an external source known as?
[A] Free oscillation
[B] Maintained oscillation
[C] Forced oscillation
[D] Damped oscillation
Show Answer
Correct Answer: B [Maintained oscillation]
Notes:
The oscillation in which the loss of oscillator is compensated by the supplying energy from an external source are known as maintained oscillation.
52. What is second’s pendulum?
[A] simple pendulum whose time period of vibrations is one second
[B] simple pendulum whose time period of vibrations is two seconds
[C] simple pendulum whose time period of vibrations is four seconds
[D] simple pendulum whose time period of vibrations is ten seconds
Show Answer
Correct Answer: B [simple pendulum whose time period of vibrations is two seconds]
Notes:
A second’s pendulum is that simple pendulum whose time period of vibrations is two seconds.
53. Which of these means opposite phase of particles?
[A] phase difference between the particle is an odd multiple of π
[B] if the path difference is an odd multiple of (λ / 2)
[C] if the time interval is an odd multiple of T/2
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Opposite Phase means: phase difference between the particle is an odd multiple of π or if the path difference is an odd multiple of (λ / 2) or if the time interval is an odd multiple of T/2
54. What do we call the distance of particle from the mean position at that instant in S.H.M?
[A] Distance
[B] Displacement
[C] Phase
[D] Angular frequency
Show Answer
Correct Answer: B [Displacement]
Notes:
The displacement of a particle executing S.H.M. at an instant is defined as the distance of particle from the mean position at that instant.
55. What do we call the wave if the constituents of the medium oscillate perpendicular to the direction of wave propagation?
[A] Transverse wave
[B] Longitudinal wave
[C] Electromagnetic wave
[D] Matter wave
Show Answer
Correct Answer: A [Transverse wave]
Notes:
If the constituents of the medium oscillate perpendicular to the direction of wave propagation, we call the wave a transverse wave. If they oscillate along the direction of wave propagation, we call the wave a longitudinal wave
56. What is the wavelength of a stationary wave?
[A] twice the distance between two consecutive nodes or antinodes
[B] equal to the distance between two consecutive nodes or antinodes
[C] half the distance between two consecutive nodes or antinodes
[D] four times the distance between two consecutive nodes or antinodes
Show Answer
Correct Answer: A [twice the distance between two consecutive nodes or antinodes]
Notes:
Wavelength (λ) of a progressive wave is the distance between two consecutive points of the same phase at a given time. In a stationary wave, it is twice the distance between two consecutive nodes or antinodes.
57. What is the wavelength range of ultraviolet rays?
[A] Between 40 nm and 40000 nm
[B] Between 60 nm and 4000 nm
[C] Between 0.0006 nm and 400 nm
[D] Between 0.6 nm and 400 nm
Show Answer
Correct Answer: D [Between 0.6 nm and 400 nm]
Notes:
The ultraviolet rays cover wavelengths ranging from about 4 × 10–7 m (400 nm) down to 6 × 10–10m (0.6 nm). The sun is an important source of ultraviolet light.
58. Which of the following waves is absorbed by the ozone layer present in the atmosphere?
[A] Gamma
[B] Visible
[C] Radio
[D] Ultra violet
Show Answer
Correct Answer: D [Ultra violet]
Notes:
UV light in large quantities has harmful effects on humans. But fortunately, most of it is absorbed in the ozone layer in the atmosphere at an altitude of about 40 – 50 km.
59. What do we call the magnitude of the maximum disturbance in the medium on either side of the mean value called as?
[A] Frequency
[B] Angular Displacement
[C] Amplitude
[D] Wave number
Show Answer
Correct Answer: C [Amplitude]
Notes:
The magnitude of the maximum disturbance in the medium on either side of the mean value is called the amplitude of the wave. It is usually represented by the letter A.
60. Which of the following represents the speed of a sound wave?
[A] wavelength x frequency
[B] 2 x wavelength x frequency
[C] wavelength/frequency
[D] (wavelength x frequency)/2
Show Answer
Correct Answer: A [wavelength x frequency]
Notes:
The speed of sound is defined as the distance which a point on a wave, such as a compression or a rarefaction, travels per unit time. It is represented by s = wavelength x frequency.
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