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




... Answer is C. Maximum at mean position
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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?​




... Answer is C. 1 N m⁻¹
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




... Answer is B. 2K
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.




... Answer is C. Velocity is zero
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




... Answer is C. Zero
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.




... Answer is B. Mass
T = 2Ï€`\sqrt frac {m}{K}`



7. When the length of the pendulum is increased four times then its time period is increased. :




... Answer is B. Two time
T = 2Ï€`\sqrt frac {l}{g}`



8. What is the frequency of the body when its time period is 2 seconds?




... Answer is D. 0.5 Hz
T = `\frac {1}{f}` = `\frac {1}{2}` = 0.5 Hz



9. A second pendulum is one that has a time period of




... Answer is B. 2 s
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?




... Answer is C. 0.71 x₀`
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:




... Answer is A. `\frac {1}{2}` k(x₀² - x²)
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12. In S.H.M., we have the conservation of




... Answer is C. Total energy
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13. A free oscillation has constant




... Answer is D. All of these
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14.  When the damping force is equal to the oscillating force then the damping is called.




... Answer is B. Critical damping
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15. A resonance occurs when the driving frequency is




... Answer is C. Equal to the natural frequency
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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




... Answer is D. Infinity
Under given conditions amplitude of the vibration is very much increased



17. Food is cooked in a microwave oven by the effect of: :




... Answer is D. Electric resonance
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