10 Question-Answer on simple pendulum
1. The work done by the string of a simple pendulum during one complete oscillation is equal to
(a) Total energy of the pendulum
(b) Kinetic energy of the pendulum
(c) Potential energy of the pendulum
(d) Zero
Ans: (d)
2. For a simple pendulum the graph between g and T2 will be:
(a) Hyperbola
(b) Parabola
(c) A curved line
(d) A straight line.
Ans: (a)
3. The graph between the length and the ( time period)2 of a simple pendulum is a:
(a) Straight line
(b) Circle
(c) Parabola
(d) Hyperbola
Ans: (a)
4. A simple pendulum of a period T has a metal bob which is negatively charged. If it allowed to oscillate above a large positively charged metallic plate, its period:
(a) Remains the same
(b) Decreases
(c) Increases
(d) Nothing can be said definitely.
Ans: ( b)
5. The length of a simple pendulum is increased by 45%. What is the percentage increase in its time period:
(a) 44%
(b) √44%
(c) 10%
(d) 20%
Ans: (d)
6. The value of g decreases by 0.1% on a mountain as compared to sea level. To record proper time here by means of a simple pendulum, its length must be:
(a) Increased by 0.1%
(b) Decreased by ).1%
(c) Increased by 0.2%
(d) Decreased by 0.2%
Ans: ( b)
7. The time period of simple pendulum of length l at a place where acceleration due to gravity is g is T. What is the period of simple pendulum of the length l at a place where acceleration due to gravity = 1.02 g
(a) T
(b) 1.02 T
(c) 0.99 T
(d) 0.01 T
Ans :( c)
8. The time period of a simple pendulum is measured as T in a stationary lift. If lift moves upwards with an acceleration of 5g, the period will be:
(a) The same
(b) Increased by 3/5 times
(c) Decreased by 2/3 times
(d) None of above
Ans: ( d)
9. If a watch with wound spring is taken to the moon, it
(a) Runs faster
(b) Runs slower
(c) Does not work
(d) Shows no change
Ans : ( d)
10. A simple pendulum attached to the roof of a lift has a time period of 2 s in a stationary lift. If the lift is allowed to fall freely the frequency of oscillations of pendulum will be:
(a) Zero
(b) 2 Hz
(c) 0.5 Hz
(d) Infinity
Ans: (a)