### Chapter 12 - Wave Motion - 2 1. The speed of light is more in air(or vaccum) than in glass or water. a) true b) false 2. When a wave enters from one medium to another its freqency does not change. a) false b) true 3. The law of reflection of water waves is not identical to law of reflection of light. a) true b) false 4. A body executing simple harmonic motion, always vibrates about its position of equilibrium. a) true b) false 5. The snake like motion of the rope is the example of a) wave motion b) circulatory motion c) translatory motion d) vibratory motion 6. If we dip a pencil into a tub of water and take it out what will it happen on the surface of water a) circular ripples are formed b) it will remain calm and still c) colour of water is changed d) water starts flowing 7. Waves can transfer one of the following from one place to another a) atoms b) medium in which waves are produced c) molecules d) energy 8. Time period is inverse of a) wavelength b) time c) frequency d) velocity 9. The wavelength of the stationary wave is ___________ the distance between two successive nodes or antinodes. a) half b) four times c) twice d) one fourth 10. If the mass of bob of a simple pendulum is doubled, its time period a) becomes half b) is doubled c) becomes four times d) remains the same 11. Bouncing back of a wave from the surface is called a) refraction b) reflection c) diffraction d) interference 12. When an object repeats a set pattern of motion in equal interval of time is known as a) wave motion b) linear motion c) vibratory motion d) translational motion 13. When an external force is applied on spring and then released,spring goes back to its equilibrium position due to a) restoring force b) electrostatic force c) gravitational force d) electromagnetic force 14. In simple harmonic motion velocity of the object is maximum at a) only one extreme position b) all of the above c) both extreme position d) the mean position 15. How many types of mechanical waves are a) two b) four c) three d) five 16. Invisible waves can be detected with a) transistor b) sensitive equipments c) transmitter d) ammeter

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