### Chapter 12 - Wave Motion - 2

 1. The speed of light is more in air(or vaccum) than in glass or water.a) trueb) false
 2. When a wave enters from one medium to another its freqency does not change.a) falseb) true
 3. The law of reflection of water waves is not identical to law of reflection of light.a) trueb) false
 4. A body executing simple harmonic motion, always vibrates about its position of equilibrium.a) trueb) false
 5. The snake like motion of the rope is the example ofa) wave motion b) circulatory motionc) translatory motiond) 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 watera) circular ripples are formed b) it will remain calm and stillc) colour of water is changedd) water starts flowing
 7. Waves can transfer one of the following from one place to anothera) atoms b) medium in which waves are producedc) moleculesd) energy
 8. Time period is inverse ofa) wavelength b) timec) frequencyd) velocity
 9. The wavelength of the stationary wave is ___________ the distance between two successive nodes or antinodes.a) half b) four timesc) twiced) 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 calleda) refraction b) reflectionc) diffractiond) interference
 12. When an object repeats a set pattern of motion in equal interval of time is known asa) wave motion b) linear motionc) vibratory motiond) translational motion
 13. When an external force is applied on spring and then released,spring goes back to its equilibrium position due toa) restoring force b) electrostatic forcec) gravitational forced) electromagnetic force
 14. In simple harmonic motion velocity of the object is maximum ata) only one extreme position b) all of the abovec) both extreme positiond) the mean position
 15. How many types of mechanical waves area) two b) fourc) threed) five
 16. Invisible waves can be detected witha) transistor b) sensitive equipmentsc) transmitterd) ammeter
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