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SSC CGL Mock test for Students
When a wave reflects off a denser medium, the phase difference is
a) 0
b) π
c) 2π
d) 3π
Option b – π
Which type of wave does not transfer energy?
a) Stationary wave
b) Electromagnetic wave
c) Longitudinal progressive wave
d) Transverse progressive wave
Option a – Stationary wave
What do waves Transport from one point to another?
a) Mass
b) Speed
c) Wavelength
d) energy
Option d – energy
In which medium does sound travel the fastest?
a) Water
b) Air
c) Metal
d) Vacuum
Option c – Metal
What is the name of the ratio of an object’s speed to the speed of sound?
a) Sonic index
b) Doppler ratio
c) Mach number
d) Refractive index
Option c – Mach number
sound waves can travel through which of the following?
a) Solid
b) Liquid
c) Gas
d) All of the above
Option d – All of the above
An explosion happens underwater near the shore. Two people are equidistant—one underwater (X) and the other on land (Y). Who hears the sound first?
a) X hears it first
b) Y hears it first
c) Both hear it at the same time
d) Y does not hear it at all
Option a – X hears it first
Identify the incorrect statement about sound.
a) It travels in straight lines
b) It is a form of energy
c) It moves as waves
d) It travels faster in a vacuum than in air
Option d – It travels faster in a vacuum than in air
If a sound wave travels east to west, in which direction do air particles move?
a) East-west
b) North-south
c) Vertically
d) None of the above
Option a – East-west
Loudness of a sound is associated with which unit?
a) Metre
b) Hertz
c) Metre per second
d) Second
Option b – Hertz
In summer, how is the echo affected?
a) It is heard sooner than in winter
b) It is heard later than in winter
c) It takes the same time as in winter
d) None of these
Option a – It is heard sooner than in winter
A hydrogen-filled balloon behaves like which of the following for sound?
a) Converging lens
b) Diverging lens
c) Concave mirror
d) Can’t be determined
Option a – Converging lens
What property must a medium possess for a wave to pass through it?
a) Inertia
b) Elasticity
c) Low resistance
d) All of these
Option d – All of these
The sitar belongs to which group of musical instruments?
a) Wind instruments
b) String instruments
c) Percussion instruments
d) Reed instruments
Option b – String instruments
Through which of the following can sound not travel?
a) Solids
b) Liquids
c) Gases
d) Vacuum
Option d – Vacuum
For an echo to be clearly heard, the minimum distance from the reflecting surface must be
a) 17 metres
b) 34 metres
c) 68 metres
d) 340 metres
Option a – 17 metres
sound can be described using
a) Frequency only
b) Amplitude only
c) Speed only
d) Frequency, amplitude, and speed
Option d – Frequency, amplitude, and speed
Which of these materials reflects sound most efficiently?
a) Thermocol
b) Cloth curtains
c) Steel
d) Paper
Option c – Steel
Seats in an auditorium are made from sound-absorbing materials because
a) They reduce echo
b) They improve sound quality
c) They allow sound to move faster
d) All of the above
Option a – They reduce echo
When a piano key is tapped lightly and then harder, what changes in the sound?
a) It becomes louder with the same pitch
b) It becomes louder and has a higher pitch
c) It becomes louder with a lower pitch
d) Both pitch and loudness stay the same
Option a – It becomes louder with the same pitch
A sitarist adjusts string tension before a performance to
a) Change only the sound intensity
b) Alter only the amplitude
c) Match the string’s frequency to other instruments
d) Modify loudness
Option c – Match the string’s frequency to other instruments
The energy of sound crossing a unit area per second is known as
a) Intensity or loudness
b) Amplitude
c) Pitch
d) Frequency
Option a – Intensity or loudness
Which of the following statements about sound speed is true?
a) It is slower in gases than in Solids
b) It increases with temperature
c) It depends on the medium
d) All of the above
Option d – All of the above
What is a typical audible frequency for humans?
a) 5 Hz
b) 27000 Hz
c) 5000 Hz
d) 50000 Hz
Option c – 5000 Hz
At 15°C, what is the approximate speed of sound in air?
a) 220 m/s
b) 340 m/s
c) 100 m/s
d) 150 m/s
Option b – 340 m/s
At constant temperature, what does sound speed in air depend on?
a) Pressure
b) Gas density
c) Both of the above
d) Neither of the above
Option d – Neither of the above
Waves where particles move at right angles to the wave’s direction are called
a) Transverse waves
b) Longitudinal waves
c) Propagated waves
d) None of these
Option a – Transverse waves
Echo is an example of
a) Reflected sound
b) Refracted sound
c) Polarised sound
d) None of these
Option a – Reflected sound
Sound is classified as
a) A mechanical wave
b) An electromagnetic wave
c) A longitudinal wave
d) Both a) and c)
Option d – Both a) and c)
Water waves are
a) Longitudinal
b) Transverse
c) A mix of longitudinal and transverse
d) Neither of these
Option c – A mix of longitudinal and transverse
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