# Simple Pendulum Viva Questions and Answers

*Simple Pendulum Viva Questions and Answers*

**(i) Who invented simple pendulum?**

**(ii) Is `g' a vector quantity?**

**(iii) What is the effective length of a simple pendulum?**

**(iv) Why do we use heavy bob which is small in size?**

**(v) What is a seconds pendulum?**

**(vi) If the given bob is replaced by a wooden bob of the same size will the time period change?**

**(vii) What will happen to the time period if a simple pendulum is setup on the surface of the moon?**

**(viii) While oscillating, the amplitude of the pendulum must be small-why?**

**(ix) What is the relation between 'g' and 'G'? Gin**^{2}

**(x) What is the value of 'g' at the centre of the earth?**

**(xi) If you set up a simple pendulum in an artificial satellite orbiting the earth what will be the period of the pendulum?***(xii) What is meant by periodic motion?*

Ans: A motion which repeats after equal intervals of time is called periodic motion.

*(xiii) What is meant by amplitude? *

Ans: It is the maximum displacement of a particle from its mean position.

*(xiv) What happens if the bob of the simple pendulum has rotatory
motion along with the translatory motion? *

Ans: The rotatory motion will produce twist in the thread which changes the time period.

*(xv) Define time period of an oscillating body. *

Ans: It is the time taken by the oscillating body to complete one oscillation.

*(xvi) Define frequency. *

Ans: Number of periodic motions that occurs in unit time is called frequency of the periodic motion.

*(xvii) How is frequency related to period of oscillation? *

Ans: Period = 1/frequency

*(xviii) How will the value of 'g' be affected if the earth stops
rotating?*

Ans: The value of 'g' would increase in general. The variation is maximum at the equator and minimum at the poles.

**(xix) Apparatus of the Simple Pendulum**

**(xx) Theory of Simple Pendulum***l*at a place where the acceleration due to gravity is g, which is given by,

*l*/g);

^{2}(

*l*/T

^{2})

**(xxi) Aim of the Simple Pendulum Experiment***l*– T

^{2}graph and hence to find the length and period of the Pendulum.

**(xxii) Procedure of the Simple Pendulum Experiment**

__(a) To find the acceleration due to gravity at the place__^{2}is calculated. In all cases it is found that (l/T

^{2}) is a constant. The average value of (l/T

^{2}) is determined and the acceleration due to gravity (g) is calculated. g = 4π

^{2}(l/T

^{2})

__(b) To draw T__^{2}— I graph^{2}along the Y-axis. This graph is a straight line.

^{2}= 4 is determined. This gives the length of the seconds pendulum.

^{2}= 1.5

^{2}= 2.25 is determined from the graph.

^{2}= AB/BC. Therefore, g = 4π

^{2}(AB/BC)

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