A cup of milk is placed in a microwave oven. Consider these statements: (1) Only the milk will be heated. (2) The cup will remain cool. (3) Both the cup and the milk will get hot. Which one is false?
Correct answer A. 3
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Everyday Science MCQs
Page 152 of Everyday Science multiple-choice questions with answers. Tap an option to check yourself.
Page 152 of 198
A body covers a distance of 20 cm in one complete vibration. What is its amplitude?
Correct answer C. 5 cm
For a simple pendulum, what provides the restoring force?
Correct answer B. Gravity
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When is the displacement of a body in S.H.M. equal to its amplitude?
Correct answer B. Extreme position
A particle moves in a circle with non-uniform speed. What motion does its projection on a diameter perform?
Correct answer C. Both B and D
Where is the velocity of a mass on a spring greatest?
Correct answer A. Mean position
At Murree Hills, assuming the value of g changes, what happens to a one-second duration if a simple pendulum is used as the time standard?
Correct answer B. Increase
What kind of motion does a mass attached to a spring perform?
Correct answer D. Both A and C
By what other name are forced vibrations known?
Correct answer D. Driven harmonic vibration
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Which quantities decrease in damped harmonic oscillation?
Correct answer D. Both amplitude and energy
When the kinetic energy of a body in SHM is at its maximum, what else is true?
Correct answer D. P.E., acceleration and restoring force are all zero
How far does the bob of a simple pendulum travel in one complete vibration?
Correct answer D. 4 × amplitude
In which device is electrical resonance used?
Correct answer B. Radio
On what does the natural frequency of a simple pendulum depend?
Correct answer A. The square root of its length
How is the sharpness of resonance related to damping?
Correct answer B. It is inversely proportional to the damping force
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What does the phase of S.H.M. describe?
Correct answer D. Both displacement and direction of motion
Which expression gives the restoring force on a simple pendulum?
Correct answer B. −mg sin θ
Which of these does not operate on the principle of resonance?
Correct answer C. Bulb
For what displacement does the potential energy in S.H.M. become one quarter of its maximum value, where x’ is the amplitude?
Correct answer B. x = x’/2
The displacement in SHM is written x = x₀ sin ωt. If it is written instead as x = x₀ cos ωt, what is the phase constant?
Correct answer A. 90°