HSSC-I (Class-11) Solved Physics MCQs; Unit-7: Oscillation (Baluchistan Textbook Board, Quetta) With Verified Answers
1. The acceleration of a body executing simple harmonic motion is
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2. What is the value of a spring constant when a 100 g mass is attached to a spring and it is accelerated 0.5 m s⁻² through a displacement of 5 cm?
F= Kx where F=ma so K = `\frac {ma}{x}` (All units must be converted to SI units before)
3. If a spring of forced constant K is cut into two equal parts, then the spring constant of each half is
F = Kx and F = K'x/2, on comparing we get K' = 2k
4. When a body is performing S.H.M. then at its extreme position.
At the extreme position, the body becomes at rest so velocity is zero
5. A particle is executing S.H.M along a straight line with amplitude A, it's kinetic energy is maximum when its displacement is
Zero displacement means the body is at the mean position where speed is maximum so maximum K.E
T = 2Ï€`\sqrt frac {m}{K}`
T = 2Ï€`\sqrt frac {l}{g}`
T = `\frac {1}{f}` = `\frac {1}{2}` = 0.5 Hz
second's pendulum requires two seconds to complete one vibration.
P.E = `\frac {1}{2}`kx² and K.E = `\frac {1}{2}` k(x₀² - x²) so when P.E = K.E we get x = `\frac {x_0}{sqrt 2}` = 0.71 x₀
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Zero displacement means the body is at the mean position where speed is maximum so maximum K.E
6. The time period of a body attached to a spring depends upon.
T = 2Ï€`\sqrt frac {m}{K}`
7. When the length of the pendulum is increased four times then its time period is increased. :
T = 2Ï€`\sqrt frac {l}{g}`
8. What is the frequency of the body when its time period is 2 seconds?
T = `\frac {1}{f}` = `\frac {1}{2}` = 0.5 Hz
9. A second pendulum is one that has a time period of
second's pendulum requires two seconds to complete one vibration.
10. In S.H.M., at what distance from the mean position in terms of amplitude X₀, K.E. and P.E. both will have equal value?
P.E = `\frac {1}{2}`kx² and K.E = `\frac {1}{2}` k(x₀² - x²) so when P.E = K.E we get x = `\frac {x_0}{sqrt 2}` = 0.71 x₀
11. The instantaneous K.E of a mass attached to the end of an elastic spring is:
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12. In S.H.M., we have the conservation of
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13. A free oscillation has constant
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Under given conditions amplitude of the vibration is very much increased
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14. When the damping force is equal to the oscillating force then the damping is called.
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15. A resonance occurs when the driving frequency is
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16.. In the absence of damping force, when the driving frequency is equal to the oscillating frequency then the amplitude of the oscillation will become
Under given conditions amplitude of the vibration is very much increased
17. Food is cooked in a microwave oven by the effect of: :
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