PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 Maximum number of orders available with a grating is. Independent of grating element Directly proportional to grating element Inversely proportional to grating element Directly proportional to wavelength
2 The fact that the edge of a shadow formed by a point source of light shining on an object is not sharp is an example of. Refraction Diffraction Polarization Dispersion
3 When white light is incident on a diffraction grating, the light that will eb deviated from central image will be. White Yellow Red Blue
4 A point source of light is situated at large distance The nature of the wave front at the point will be. Cylindrical Spherical Plane Ellipical
5 Polarization is characteristic of. Light wave sound waves Waver waves x-rays
6 The wave phenomenon that classifies light as a transverse wave is. Polarization Diffraction Interference Refraction
7 Light from the sun reaches the earth in Spherical wave fronts Cylindrical wave fronts Plane wave fronts Packets
8 The fundamental frequency of a sound source is 256 Hz. What is the frequency of the first harmonic. 64 128 256 512
9 Three tuning forks of frequencies 400 Hz. 401 Hz and 402 Hz are sounded together The frequency of beats per sound is. 0 1 2 3
10 Two tuning forks have same natural frequency One of them is now loaded with wax. When both the forks are sounded together the will Produce interference Produce vibrations Remain in resonance Produce beats
11 When temperature increases, frequency of an organ pipe Decreases Increases Remain the same Become zero
12 When the source and observer are moving away from each other the apparent pitch will Increases Decreases Be zero Be infinite
13 For polarization , the direction of oscillation has to be perpendicular to the direction of travel sound waves are longitudinal waves so they cannot be. Reflected Deflected Diffracted polarized
14 Stationary waves are produced when two identical waves are moving on the string. Along the same direction Along the opposite direction Along the perpendicular direction Of length 1 m
15 Two tuning forks of frequencies 260 Hz and 257 Hz are sounded together the number of beats produced per seconds is. 1 3 4 257
16 Beats are the results of. Diffraction of sound waves Interference Polarization Timber
17 Ultra sonics are the Frequencies in the audible range Frequencies greater than 20 Hz Frequencies greater than 20 KHz Frequency lower than 20 KHz
18 The unit of intensity of sound waves is. W m-1 W m-2 N m-1 N m-2
19 Sounds of frequencies higher than 20,000 Hz are called. Super sonics Infrasonic Ultrasounds Audible sound waves
20 Sound of frequencies lower than 20 Hz are called. Supersonics Infra sonics Ultrasonic Audible sound waves
21 Pitch of the sound determines Its shrillness Loudness of sund Intensity level Quality of sound
22 The unit of intensity level is. Watt Joule Bel Sabin
23 If the period of a wave motion is 2 s and the wave speed is 4 cm s-1 then its frequency is 1/8 C s-1 1/2 C s-1 2 C s-1 8 C s-1
24 A wave source of frequency 1,000 Hz emits waves of wavelength 0.1 m How long does it take for the waves to travel 2500 m. 4 s 25 s 40 s 100 s
25 The energy following per second through a unit area held perpendicular to the direction of wave is. The loudness of the sound waves The pitch of the sound waves The intensity level of sound waves The intensity of sound waves
26 When sound waves enter a different medium the quantity that remains unchanged a. Wavelength Speed frequency Intensity
27 On loading the prong of a tuning fork with wax. Its frequency. Increases Decreases Remain unchanged May increase or decrease
28 Increase in velocity of sound in air for 1 oC rise in temperature is. 0.61 m s-1 1.61 m s-1 2.00 m s-1 61.0 m s-1
29 Sound wave do not travel in vacuum because. they are transverse waves They are stationary waves They require material medium for propagation They do not have enough energy
30 Sound wave in air are Longitudinal waves Transvers waves Electromagnetic waves Matter waves
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