**Short Questions**

A ball is dropped from a certain height onto the floor and keeps bouncing. Is the motion of the ball simple harmonic? Explain. |

Define Mechanical and Electromagnetic waves with example? |

Define Simple Harmonic Motion. Write conditions for SHM. |

Define simple pendulum and time period of simple pendulum. |

Define vibratory motion. |

Differentiate between compression and rarefaction? |

Differentiate between crest and trough? |

Differentiate between mechanical waves and electromagnetic waves. |

Differentiate between time period and frequency in case of vibratory motion. |

Differentiate between transverse waves and compressional or longitudinal waves. |

Draw a figure to show the Kinetic and Potential energy at different positions in a mass-spring system. |

If the length of a simple pendulum is doubled, what will be the change in its time period? |

Relate the speed of longitudinal and transvers waves through solid, liquid and gas. |

State Hooke’s Law. Give its expression. |

What types of waves do not require any material medium for their propagation? |

What are the factors upon which the time period of simple pendulum depends? |

What do you know about restoring force? OR Define restoring force. |

What happens to the frequency of pendulum, as its oscillations dies down from large amplitude to small? |

What is meant by oscillation? |

What is meant by spring constant? |

What is second pendulum? |

What is the displacement of an object in SHM when kinetic and potential energies are equal? |

What is the frequency of second pendulum? |

What will be the time period of simple pendulum at the center of the Earth? |

Why does the pendulum lose time in summer and gains time in winter? |

With respect to simple pendulum, what is the difference between vibration and amplitude? |

**Long Questions**

A simple pendulum completes one vibration in two seconds. Calculate its length, when g = 10.0 m s⁻² . |

A pendulum of length 0.99 m is taken to the Moon by an astronaut. The period of the pendulum is 4.9 s. What is the value of g on the surface of the Moon? |

A transverse wave produced on a spring has a frequency of 190 Hz and travels along the length of the spring of 90 m, in 0.5 s. the length of the spring of 90 m, in 0.5 s. (a) What is the period of the wave? (b) What is the speed of the wave? (c) What is the wavelength of the wave? |

A wooden bar vibrating into the water surface in a ripple tank has a frequency of 12 Hz. The resulting wave has a wavelength of 3 cm. What is the speed of the wave? |

At one end of a ripple tank 80 cm across, a 5 Hz vibrator produces waves whose wavelength is 40 mm. Find the time the waves need to cross the tank. |

Derive a relationship between velocity, frequency and wavelength of a wave. Write a formula relating of a wave to its time period and wavelength. |

Distinguish between longitudinal and transverse waves with suitable examples. |

Does increasing the frequency of a wave also increase its wavelength? If not, how are these quantities related? |

Draw a transverse wave with an amplitude of 2 cm and a wavelength of 4 cm. Label a crest and trough on the wave. |

Explain the following properties of waves with reference to ripple tank experiment: a. Reflection b. Refraction c. Diffraction |

Find the time periods of a simple pendulum of 1 metre length, placed on Earth and on Moon. The value of g on the surface of Moon is 1/6 of its value on Earth, |

How can you Define the term wave? Elaborate the difference between mechanical and electromagnetic waves. Give examples of each. |

If 100 waves pass through a point of a medium in 20 seconds, what is the frequency and the time period of the wave? If its wavelength is 6 cm, calculate the wave speed. |

The time period of a simple pendulum is 2 s. What will be its length on the Earth? What will be its length on the Moon if gm =ge /6? where ge = 10 ms⁻² |

Think of several examples of motion in everyday life that are simple harmonic. |

Water waves in a shallow dish are 6.0 cm long. At one point, the water moves up and down at a rate of 4.8 oscillations per second. (a) What is the speed of the water waves? (b) What is the period of the water waves? |

Waves are the means of energy transfer without transfer of matter. Justify this statement with the help of a simple experiment. |

What are damped oscillations. How damping progressively reduces the amplitude of oscillation? |

What is simple harmonic motion? What are the necessary conditions for a body to execute simple harmonic motion? |

What is the wavelength of the radiowaves transmitted by an FM station at 90 MHz? where 1M = 10⁶ , and speed of radiowave is 3 x 10⁸ ms⁻¹ . |

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