2nd Year Physics Chapter 3 Test17. Simple Harmonic Motion

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. When P.E of the spring is maximum for a spring mass system:
   1. K.E of mass is zero
   2. K.E of mass becomes infinite
   3. K.E of mass is maximum
   4. none of these
2. A mass attached to a spring completes 60 vibrations in half minute. Its frequency is:
   1. 120 Hertz
   2. 60 Hertz
   3. 30 Hertz
   4. 2 Hertz
3. If mass attached to a spring is made four times, the time period becomes:
   1. Doubled
   2. One half
   3. Remains same
   4. Four times
4. Food being cooked in microwave oven is an example of:
   1. Unequal the natural frequency
   2. Overtone
   3. Resonance
   4. Stationary waves
5. Why are soldiers ordered to break step while crossing a bridge?
   1. To increase the bridge’s natural frequency
   2. To avoid resonance
   3. To reduce the weight on the bridge
   4. To match the bridge’s damping frequency
6. A block weighing 4.0 kg extends a spring by 0.16 m from its unstretched position, stretching force is:
   1. 39.2 N
   2. 16.3 N
   3. 20.3 N
   4. 14.2 N
7. If the initial phase is π/2 rad, the instantaneous displacement in SHM will be:
   1. x₀sin⁡ωt
   2. x₀cos⁡ωt
   3. −x₀sin⁡ωt
   4. Zero
8. If F = 0.4 N and x = 2 m then k =:
   1. 0.2 N/m
   2. 0.5 N/m
   3. 0.8 N/m
   4. 0.4 N/m
9. When the frequency of the applied force becomes equal to one of natural frequencies of body then the body oscillates with maximum displacement this phenomenon is called:
   1. Damping
   2. esonance
   3. Reverberation
   4. Damping
10. In SHM, when acceleration is maximum, then velocity is:
    1. Maximum
    2. Increases
    3. Is constant
    4. Zero