PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 The heat frequency is the Sum of the two frequenceis Produce of the two frequency Difference of the two frequencies Ratio of the two frequencies
2 Which analysis is employed to convert a complex sound into notes. Fourier theorem Milleman theorem Lissajoes theorem Demorgan's law
3 Which effect produce ultrasonic is quartz. Pyroelectric effect Piezoelectric effect Hall effect Magnetostriction effect
4 Hearing damage is possible at sound pressure of 0 dB 50 dB 130 dB 195 dB
5 Which technique uses underwater sound propagation to detect and locate submerged objects. RADAR LIDAR SONAR LASER
6 The perceived fundamental frequency of a sound is called. Pitch Timber Loudness Wavelength
7 The addition of two or more waves is termed as Interferences Period Echo Polarization
8 The phase velocity is the velocity of a point that moves with a wave at constant phase it is also called.

 Phase speed Wave speed Wave velocity All of these
9 The average amount of energy transported by a wave per unit area per unit time is termed as Wave speed Wave intensity Wavelength Wave amplitude
10 The speed of a sound wave is independent of Nature of medium Pressure Temperature Mass and energy
11 When stationary waves are formed in a closed organ pipe. A node is formed at the closed end of the pipe An antinode is formed at the closed end of the pipe Each particle at the node experience zero acceleration The maximum pressure occurs at the nodes
12 A wave source of frequency 1000 Hz emits waves of wavelength 0.1 m How long does is take for the waves to travel 2500 m. 20 s 25 s 40 s 100 s
13 A cork moes at 5 m s-1 on the crest of a wave The distance between the crests is 10 m. The frequency of the wave motion is. 0.5 Hz 1.0 Hz 2.0 Hz 5.0 Hz
14 When two identical travelling waves are superposed, velocity of the resultant wave Remains unchanged Decreases Increases Become zero
15 The energy transmitted per second though unit are held perpendicular to the direction of propagation of the wave is called. Intensity of sound Pitch of sound Loudness of sound Quality of sound
16 The wavelength is the distance along the line of wave propagation between two successive particles which have equal Velocities Phases Amplitude Displacements
17 The velocity of sound will be greater in. Air Water Solids Vacuum
18 Velocity of sound in air at a given temperature Increases with increase in pressure Is independent of the pressure Decreases with increases in density Increases with increase in density
19 If a wave vibrates 10 times in one second with a speed of 10 m s-1 the wavelength will be. 1 m 10 m 20 m 100 m
20 Which of the following factor will not affect the speed of sound i a medium. Temperature Pressure Humidity Mass
21 The maximum displacement from the undisturbed position of the medium to the crest top is called. Wavelength Amplitude Period Frequency
22 Which of the following refers to the distance from crest to crest of a wave. Frequency Wavelength Amplitude Period
23 The phenomenon of beats takes place due to Longitudinal waves Transverse waves Stationary waves Both a and b
24 What is the change in path when sound wave is reflected from a rigid support. Lamda /2 Lamda 2 lamda Zero
25 Beats occur due to Reflection Refraction interference Diffraction
26 The interference between two sounds of slightly differed frequency is shock wave Beats Sonic boom Doppler's effect
27 The sound waves used sonography are Less than 20 KHz of 20 Khz Greater than 20 KHz Of 20 MHz
28 The loudness of a sound depend on its Frequency Amplitude Speed Both a and b
29 The energy transported by a wave is proportional to the square of the. Wavelength of the wave Period of the wave Amplitude of the wave Frequency of the wave
30 A sound wave is an example of Transverse wave longitudinal waves Hair wave Stationary wave
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