KBL ACADEMY OF SCIENCES SHAKARGARH

Class:……… 1st year Chapter……8. BOARD’S MCQs Total Marks:……..72

Paper:…..Physics Name: Time:………..45 mints
Q: No: 01: - Choose the correct option.
1 Longitudinal wages do not exhibit Or Sound waves cannot be
A Reflection B Refraction C Polarization D Diffraction
2 Longitudinal waves are also known as
A Stationary waves B Transverse waves C Compressional D Electromagnetic
waves waves
3 When the amplitude of a wave is increased to double, its energy
A Remains the same B Increases by two C Increases 4 times D Decreases by half
times
4 When a transverse wave is incident on a rarer medium from a denser medium, the phase change will be
A 900 B 600 C 1800 D 00
5 Which one of the following media can transmit both transverse and longitudinal waves?
A Solid B Liquid C Gas D Plasma
6 The portion of the wave above the mean level is called
A Node B Antinode c Crest D Trough
7 In a vibrating string, the points where the amplitude is maximum are called
A Nodes B Antinodes C Troughs D Crests
8 The wavelength of a transverse wave travelling with a speed ‘v’ having frequency ‘f’ is equal to
A f/v B Vf C v /f D f /v2
9 The distance covered by a wave in 1 s is called
A Wavelength B Wave number C Frequency D Wave speed
10 The wave associated with the particles in motion is called
A Light waves B Electromagnetic C Matter waves D Both a and b
waves
11 Distance between the crest and trough is
A λ B λ C λ D 2λ
2 4
-1
12 10 waves pass through a point in 2 s with speed 10ms , the frequency of wave will be
A 1 Hz B 2 Hz C 5 Hz D 10 Hz
13 The profile of periodic waves generated by a source executing SHM is represented by a
A Circle B Sine curve C Tangent curve D Cosine curve
14 The distance between a compression and its adjacent rarefaction is
A λ B λ C 2λ C λ
2 4
15 If 332 waves pass through a medium in 1 s with speed of 332 ms1, then wavelength will be
A 7m B 332 m C 664 m D 1m
16 Longitudinal waves of frequencies less than 20 Hz are known as
A Infrasound B Ultrasound C Supersound D Audible sound
17 Crest and through formed in
A Longitudinal waves B Transverse waves C Stationary waves D Compressional waves
-1
18 If 20 waves pass through the medium in 2 with a speed of 10 ms , then the wavelength is
A 200 m 2b 2m C 1m D 0.5 m
19 According to newton, sound travels in air under conditions of
A Adiabatic B Isothermal C Isobaric D Isochoric
20 According to newton’s formula, the speed of sound in air at STP is
A 332 ms-1 B 350 ms-1 C 340 ms-1 D 280 ms-1
21 The velocity of sound in vacuum is
A 280 ms-1 B 332 ms-1 C 333 ms-1 D 0 ms-1
22 The value of Ƴ for mono-atomic gas is
A 1.67 B 1.40 C 1.29 D 1.45
23 The medium in which the speed of light is the same in all homogenous directions is called
A Homogenous B Heterogeneous C Non- homogenous D Free space
24 The waves that do not need any medium for their production and propagation are called
A Mechanical waves B Matter waves C Electromagnetic D Compressional waves
waves
25 Sound waves cannot travel through
A Air B Water C Material medium D Vacuum
26 The speed of sound has the maximum value in
A Oxygen B Air C Hydrogen D Helium
0 -1 0
27 The velocity of sound at 0 C is 332 ms , the velocity of sound at 10 C wiil be
A 337.1 ms-1 B 338.1 ms-1 C 342.1 ms-1 D 348.1 ms-1
28 What is the value of constant β in the expression vt = vo (1+ β t)
A 273 B 1 C 0.61 D 1.42
273
29 The speed of sound is greatest in
A Air B Steel C Ammonia D Water
30 The speed of sound in air depends upon
A Temperature B Humidity C Density D All of these
31 The speed of sound in air does not depend upon
A Density B Pressure C Humidity D Temperature
32 Sound travels faster in
A CO2 B H2 C O2 D He
33 If the pressure of a gas is doubled, then speed of sound is
A Double B Half C Not affected D Increased by four
times
34 With increase of temperature, the speed of sound
A Remains constant B Becomes zero C Decreases D Increases
35 Speed of sound in copper is
A 38000ms-1 B 3600ms-1 C 3500ms-1 D 3400ms-1
-1
36 The speed of sound in air is 340 ms . If the pressure of air is doubled then the speed
A Double B Half C Four times D Remains the same
37 Speed of sound in aluminum at 200C is
A 3600 ms-1 B 5100 ms-1 C 5130 ms-1 D 5500 ms-1
38 The louder the sound, the greater will be its
A Speed B Frequency C Amplitude D Wavelength
39 Frequency range of hearing of cast is
A 20-20000 Hz B 10-10000 Hz C 60-20000 Hz D 60-70000 Hz
40 When sound waves enter in different medium, the quantity that remains unchanged is
A Intensity B Speed C Frequency D Wavelength
41 Two waves of same frequency and moving in the same direction produce
A Interference B Diffraction C Beats D Stationary waves
42 When two identical travelling waves are superimposed, velocity of resultant wave
A Decreases B Increases C Remains the same D Becomes zero
43 When two identical waves superimposed, which one can change?
A Wavelength B Frequency C velocity D Amplitude
44 Diffraction is a special type of
A Reflection B Polarization C Interference D Refraction
45 On loading the prong of a tuning fork with wax, the frequency of sound
A Increases B Decreases C Remains the same D
First increases then
decreases
46 Two tuning forks of frequencies 240Hz and 243Hz are sounded together, the number of beats per second is
A Zero B 4 C 3 D 2
47 Beats can be heard when difference of frequency is not more than
A 8 Hz B 10 Hz C 4 Hz D 6 Hz
48 Beats are used to find
A Frequency B Wavelength C Speed D Intensity
49 Two identical tuning forks are operating simultaneously, the number of beats per second will be
A 0 B 1 C 2 D 3
50 The basic principle of beats is
A Interference B Diffraction C Reflection D Refraction
51 When two identical wave move in opposite direction, they give rise to
A Stationary waves B Beats C Constructive D Destructive
interference interference
52 The louder the sound, the greater will be its
A Amplitude B Wavelength C Speed D Frequency
53 When two notes of frequencies f1 and f2 are sounded together, beats are formed. If f1 > f2 what will be the beat
frequency?
A F1 + f2 B 1 C F1 - f 2 D 1
(F1 + f2) (F1 - f2)
2 2
54 On reflection from denser medium, light wave undergoes a phase change of
A π rad B π C 3π D 2 π rad
rad rad
2 2
55 The distance between a consecutive node and anti – node is
A λ B λ C 2λ D λ
4
56 The distance between two consecutive node or antinodes is
A λ B λ C 2λ D λ
2 4
57 The stationary waves consist of
A Crests and troughs B Compressions and C Nodes and antinodes D Reflection and
elongation rarefaction
58 In stationary waves, the velocity of particle at the node is
A Maximum B Infinite C Variable D Zero
59 Stationary waves are generated on a string of length ‘I’, its fundamental frequency is
A v B v C 2I D f1 = 2(v ×I)
f1 = f1 = f1 =
I 2I v
60 In stationary waves, the velocity of particle at the node is
A Maximum B Infinite C Zero D Variable
61 In stationary waves, the points which always remains at rest are
A Nodes B Antinodes C Crests D Troughs
62 If a string fixed at both ends vibrates in ‘n’ loops, then wavelength in terms of length ‘I’ of string is given by
A ¿ B I C 2I D 2I
2 2n n v
63 A set of frequency which is multiples of the fundamental frequency are called
A Doppler effect B Nodal frequencies C Beat frequencies D Harmonics
64 A stretched string is 4 m long and it has 4 loops of stationary waves, then the wavelength is
A 1m B 2m C 3m D 40 J
65 A string of length ‘I’ fixed at both ends is vibrating in two segments, the wavelength os wave is
A I B I B 2I D 3I
2
66 A stationary wave is established in a string which vibrates in four segments at a frequency of 120 Hz. Its
fundamental frequency is
A 15 Hz B 30 Hz C 60 Hz D 480 Hz
67 Wavelength of a wave for closed pipe having length ‘I’ in the fundamental mode is
A 2I B I C 4I D I
2
st th
68 The distance between 1 node and 4 antinode is
A 7 B 5 C 13 D 11
λ λ λ λ
4 4 4 4
69 The pitch of sound depends upon
A Intensity of sound B Loudness of sound C Wavelength of D Frequency of sound
sound
70 Stars moving away from earth show a
A Green shift B Blue shift C Yellow shift D Red shift
71 The speed of stars and galaxies can be calculated by
A Compton effect B Stefan’s law C Doppler’s effect D Pascal’s law
72 The wave used in radar speed trap are
A Longitudinal B Sound waves C Microwaves D Matter waves