11th class (Fsc) Physics unit 7 MCQs
26. If mass of pendulum becomes double, then its time period will be:
a. Four times
b. Doubled
c. Remains same
d. half
27. The velocity of a particle having SHM is v at mean position. If its amplitude is doubledthen velocity at mean position will be:
a. 2v
b. ~
c. 4v
d. V
28. The acceleration of a body having SHM, depends upon its:
a. Frequency
b. Time period
c. Displacement from mean position
d. Amplitude
29. If the tension of a stretched string is made four times then the velocity of wave:
a. Becomes twice
b. Remains same
c. Becomes 4 times
d. Is halved
30. When a particle is moving along a circular path, it projection along the diameter performs:
a. Linear motion
b. SHM
c. Rotatory motion
d. Vibratory motion
31. The waveform of SHM is:
a. Tangent wave
b. Sine wave
c. Square wave
d. Cosine wave
32. Phase difference between two points of a wave front is:
a. 𝜋
b. zero
c. 3 𝜋/2
d. 𝜋/2
33. When one-fourth of the cycle of a vibrating body is completed then the phase change in it is:
a. 3π/2 radian
b. π/4 radian
c. π radian
d. π/2 radian
34. Phase angle of 180o is equivalent to a path difference of:
a. 2λ
b. λ/2
c. λ
d. λ/4
35. Which of the following quantity can be expressed in kg s-2 ?
a. Momentum
b. Spring constant
c. Force
d. Density
36. The expression for frequency of a mass “m” attached to a spring of spring constant k is:
a. 1/2π √k/m
b. 2π √k/m
c. 1/2π √m/k
d. 2π √m/k
37. A spring has a spring constant k. if it is cut in two equal parts, the spring constant of each part will be:
a. k/2
b. K
c. 4k
d. 2K
38. Total energy of mass spring system at displacement X= xo/2 will be
a. kϰ2o
b. 1/2 kϰ2o
c. 1/4 kϰ2o
d. 1/2k (ϰ2o – ϰ2)
39. The time period of an oscillating mass spring system is 1.0 second. If mas attached to spring is doubled then time period becomes:
a. 5 sec
b. 10 sec
c. 10 √ 2 sec
d. 20 sec
40. The frequency of simple pendulum is given by:
a. 1/2π √ l/g
b. 1/2π √ g/l
c. 2π √ l/g
d. 2π √ g/l
41. At which place the motion of a simple pendulum will be slowest:
a. Murree
b. Karachi
c. Lahore
d. k-2
42. By increasing the mass of a simple pendulum its period:
a. Remains same
b. Increases
c. Become zero
d. Decreases
43. If length of the pendulum is constant and its mass of the body is doubled. Its time period.
a. Four times
b. Doubled
c. Remains same
d. Half
44. The length of simple pendulum of time period 1 second is:
a. 0.5 m
b. 2 m
c. 0.25 m
d. 1 m
45. Total energy of a particle executing SHM is:
a. 1/2 kϰ2o
b. 1/2 kx2
c. 1/2k (ϰ2 – ϰ2o)
d. 1/2k (ϰ2o – ϰ2)
46. Tuning of radio is example of:
a. Physical resonance
b. Mechanical resonance
c. Biological resonance
d. Electrical resonance
47. Oscillation of shock absorber of a car is practical example of:
a. Damped oscillation
b. Simple harmonic motion
c. Undamped oscillation
d. Forced oscillation
48. The distance covered during vibration of an oscillating body in terms of amplitude “A” is:
a. 2A
b. V/2
c. 4A
d. A
49. A quantity which indicates the state and direction of a vibrating body is known as:
a. Phase
b. Time period
c. Frequency
d. Amplitude
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