Physics Class 11 - Chapter 8 WavesTest - 4

Physics Class 11 - Chapter 8
Waves
Test - 4

1. The dimension of elastic modulus is?

a) ML^-2T^-1
b) ML^-2T^-2
c) ML^-1T^-1
d) ML^-1T^-2

2. The velocity of sound in air would become double then its velocity at 0C at temperature?

a) 550 C
b) 313 C
c) 1000 C
d) 819 C

3. Ultrasonic have?

a) All of the above
b) Frequency lower than 20 kHz
c) Frequency in the audible range
d) Frequency greater than 20 kHz

4. The particle in the wave separated through multiple of lambda are out of phase to each other?

a) n
b) All of these
c) n+1/2
d) n+1

5. Silence zone take place due to?

a) Beatsa
b) Resonance
c) Constructive interference
d) Destructive interference

6. Doppler effect applies to?

a) None of these
b) Both of these
c) Light waves
d) Sound waves

7. The periodic alternation of sound between maximum and minimum loudness are called?

a) Resonance
b) Beats
c) Interference
d) Silence zone

8. Beats are the results of?

a) Diffraction of sound waves
b) Constructive and destructive interference
c) Polarization
d) Constructive only

9. On loading the prong of a tuning form with wax, its frequency?

a) Increases
b) All of these
c) Remain unchanged
d) Decreases

10. In open organ pipe?a) Both of these are possible
b) Selected harmonics are present
c) Only even harmonics are present
d) Only odd harmonics are present

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