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Oscillations And Waves QUESTIONS AND ANSWERS

IIT JEE : Oscillations And Waves QUESTIONS AND ANSWERS :: part2 : 16 to 20

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :

16.Consider a stretched string under tension and fixed at both ends. If the tension is doubled and the cross-sectional area halved, then the frequency becomes

twice

half

four times

eight times

17.What change in mass is required to double the frequency of a harmonic oscillator ?

The mass must be reduced to one-fourth its original value

The mass must be reduced to half its original value

The mass must be doubled.

The mass must be increased to four times its original value

18.A mass M is suspended from a spring of negligible mass. The spring is pulled a little and is then released so that the mass executes SHM with a time period T. If the mass is increased by m, then the time period becomes 5 / 4 T. The ratio m / M is

9/16

4/5

25/16

5/4

19.Two springs have force constants in the ratio 4 : 9. Their time periods are in the ratio of

3 : 2

2 : 3

1 : 3

3 : 1

20.What fraction of the total energy is kinetic when the displacement is one-half of the amplitude ?

1/4

2/4