PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 Which term is used for the persistence of sound in a hall. Resonance Acoustics Symphony Reverberation
2 Which of the title for combining of notes that produce jarring effect on the ear. Noise Melody Harmony Discord
3 What will be the frequency it an employ vessel is filled with water. Increases Decreases Remain unchanged Fundamental
4 Which characteristics successively increases in the musical scale. Pitch Quality Loudness Amplitude
5 A pendulum vibrates with a time period of 1 s which range of sound is produced by it Audible Infrasonic Ultrasonci Super sonic
6 What is shapes of a pure note Sinwave Sawtooth Square wave Triangular wave
7 What will be the sound speed if the frequency is doubled. zero Half Double Unchanged
8 In order to har an echo what is the minimum distance between the sound and reflecting surface. 0.65 m 16.5 m 1.65 m 165 m
9 A water wave is an example of Electromagnetic wave Longitudinal wave Transverse wave Reverberation
10 A water wave is an example of Electromagnetic wave Longitudinal wave Transverse wave Reverberation
11 Echoes arise from Reflection Refraction Diffraction Dispersion of sound waves
12 In case of longitudinal waves the individual particles of the medium move. In circles In ellipses Parallel to wave propagation Perpendicular to wave propagation
13 To produce beats it is necessary to use two waves. Travelling in opposite direction Of slightly different frequencies Of equal wavelengths Of equal amplitudes
14 Difference in the density of two medium when waves are passing from one into another medium always results in the change in. Wave speed Wave direction Both speed and direction Wave frquency
15 When mas of a string is increased 4 times its original valve, the velocity of the wave. Becomes double Reduces to one half Reduces to one fourth Increases 4 times to its original value
16 Frequency less than 120 Hz are known as Infrasonic Ultra sonics Super sonics Infrared
17 Which property of waves is independent of the others. Amplitude Velocity Frequency Wavelength
18 Light wave are Longitudinal Transverse Sometimes longitudinal and sometimes transverse Neither longitudinal nor transverse
19 When a monochromatic wave enters from one medium into another the property that remains unchanged. Amplitude Velocity Frequency Nature of the wave
20 Longitudinal waves cannot be Reflected Difracted Dispersed Polarized
21 the amplitude of a wave indicates Wavelength Frequency Intensity of wave Nature of wave
22 Beats occurs because of. Reflection Refraction Interference Doppler's effect
23 The energy content of a wave is proportional to its. Wave velocity Wave velocity squared Frequency Amplitude squared
24 The quality of a note Decreases with loudness Varies directly as its pitch Varies inversely as its pitch Depends upon the overtones
25 Ultrasonic sound waves Can be heard by a normal human ear Can be heard with the help of hearing apparatus Can be heard with the help of microphone cannot be heard
26 The closed end of an organ pipe having longitudinal stationary waves in it behaves as Antinode Source of waves Node Antinode
27 When transvers wave travelling in a less dense medium is reflected at an interface will a more dense medium. A trough becomes a crest There is no phase shift There is phase shift of 360 <sup>o</sup> A crest remains a crest
28 When a transverse wave is reflected on going from a more dense to a less dense medium. There is no phase shift There is a 180 <sup>o</sup> phase shift There is a phase shift of 360 <sup>o</sup> A crest is transformed to a trough
29 The phenomenon of interference comes about because waves obey the impulse momentum theorem An inverse square law of intensity The principle of reciprocity The principle of super position
30 If a rope in a hand makes 10 oscillations after every 2 s. the frequency of the wave is. 2 C s-1 5 C s-1 10 C s-1 20 C s-1
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