• #### 1.  damped oscilation the directions of the restoring force and the resistive force

• are the same
• are opposite
• may be same or opposite
• have no relation with each other

• two
• three
• four
• five

• 0 cm
• 6 cm
• 2 cm
• cm
• #### 4.  One of the two clocks on the earth is controlled by a pendulum and other by a spring. If both the clocks are taken to the moon, then which clock will have the same time - period of the earth?

• spring clock
• pendulum clock
• both
• none

• 10 cm
• 5 cm
• 2.5 cm
• 20 cm
• #### 6.  For a magnet of time period T magnetic moment is M, if the magnetic moment becomes one fourth of the initial value, then the time period of oscillation becomes.

• Half of initial value
• One fourth of initial value
• Double of initial value
• Four time initial value

• T
• 1.02 T
• 0.99 T
• 1.01 T
• #### 8.  In the case of forced oscillations, which of the following statements is not true?

• frequency equals that of external periodic force
• amplitude depends upon the damping coefficient
• amplitude tends to infinity at resonance
• higher the damping coefficient, lower is the amplitude at resonance

• 0.001
• 0.02
• 0.1
• 0.2
• #### 10.  In damped oscilation, the angular frequency of the oscillator

• keeps on decreasing
• keeps on increasing
• emains the same
• fluctuates
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