MCQs 3 term

A body moves in simple harmonic motion of amplitude 0.90 m and period 8.9 s. What is the speed of the body when its displacement is 0.70 m?

• 0.11 m s^–1

• 0.22 m s^–1

• 0.40 m s^–1

• 0.80 m s^–1

4. The velocity of a certain simple harmonic oscillator is given by v = (12 m/s) sin [(6.0 rad/s) t]. What is the amplitude of the displacement of the SHM?

• 2.0 m

• 4.0 m

• 6.0 m

• 12.0 m

4. The graph shows how the displacement varies with time for an object undergoing simple harmonic motion?

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The variation with frequency f of the amplitude x_o of the forced oscillations of a machine is as shown. Which of the following statement is false?

• Resonance frequency of the above system is 12 Hz

• For no damping, the maximum amplitude is 1.6 cm

• Increased damping reduces the sharpness of the resonance peak

• Damping decreases the maximum amplitude of the oscillations

Under which of the following conditions would you expect real gases to approach ideal behavior?

• Low temperature and low pressure

• High temperature and low pressure

• Low temperature and high pressure

• High temperature and high pressure

Consider two ideal gases, A and B, at the same temperature. The rms speed of the molecules of gas A is twice that of gas B. How does the molecular mass of A compare to that of B?

• The molecular mass of A is twice that of B.

• The molecular mass of A is one half that of B.

• The molecular mass of A is 1.4 times that of B.

• The molecular mass of A is one fourth that of B.

Complete the following sentence: Resonance occurs in harmonic motion when

• the system is over damped.

• the system is critically damped.

• the energy in the system is a minimum.

• the driving frequency is the same as the natural frequency of the system.

On a cold day (-3 °C), the gauge pressure on a tire is 2.0 atm. If the tire is heated to 27 °C, without changing its volume, what will the gauge pressure be?

• 2.5 atm

• 2.9 atm

• 2.2 atm

• 3.3 atm

The graph below represents the variation time of the displacement of an oscillating particle. The motion of the object is

• Оver damped

• Critically damped

• Light damped

• Not damped

A simple pendulum with a length of 2 m oscillates on the surface of a hypothetical planet Y. What is the surface gravity on the planet if the period of oscillations is 8 s?

• 1.23 $\frac{m}{s^2}$

• 3.73 $\frac{m}{s^2}$

• 11.2 $\frac{m}{s^2}$

• 2.46 $\frac{m}{s^2}$