## Chapter 8 topic WAVES

1. stationary waves only of discrete  set of frequencies are set up in medium. this fact is called
a. harmonics
b. overtones
c. quantization of frequencies
d. superposition of frequencies

2.newton calculated the velocity of the sound in air at S.T.P equal to
a.280 m/s
b.250 m/s
c.300 m/s
d.322 m/s

3.which one of the following properties of sound is affected by change in air temperature
a.frequency
b.amplitude
c.intensity
d.wavelength

4.the velocity of sound in air would become double than its velocity at200C is
a.313 K
b.586 K
c.899 K
d.1172 K

5.if 20 waves pass through the medium in 1 second with speed 20 m/s then the wavelength is
a.20 m
b.2 m
c.400 m
d.1 m

6.beats can be heard when difference of frequency is not more than
a.8
b.10
c.4

d.6

7.the system followed by newton for the determination of speed of sound in air is
b.isothermal
c.isobaric
d.isochoric

8.stars moving towards the earth show
a.red shift
b.blue shift
c.yellow shift
d.green shift

9.the speed of sound in air at S.T.P is 300 m/s.if the air pressure becomes double the temperature remains the same, the speed of sound would become
a.1200 m/s
b.600 m/s
c.300 under root 2 m/s
d.300 m/s

10.destructive interference occurs as
a.two waves that are in phase and moving in opposite direction meet
b.crests of two waves coincide and topple over
c.trough of two waves coincide
d.the crest of one wave coincides with the trough of an oncoming wave

11.what does a wave carry?
a.particles
b.energy
c.matter
d.heat

----------------------------------------------Continued on Entry Test Class -----------------

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3. 4. 5. 