Best Mock Test for SSC CGL. We covered all the Best Mock Test for SSC CGL in this post for free so that you can practice well for the exam.
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SSC CGL Mock Test for Students
When a wave is reflected from a denser medium, the change in phase is
(a) 0
(b) π
(c) 2π
(d) 3 π
Option b – π
Energy is not propagated by
(a) stationary waves
(b) electromagnetic waves
(c) longitudinal progressive waves
(d) transverse progressive waves
Option a – stationary waves
Which of the following is carried by the waves from one place to another?
(a) Mass
(b) Velocity
(c) Wavelength
(d) Energy
Option d – Energy
The velocity of sound is largest in
(a) water
(b) air
(c) metal
(d) vacuum
Option c – metal
The ratio of the speed of a body to the speed of sound is called
(a) Sonic index
(b) Doppler ratio
(c) Mach number
(d) Refractive index
Option c – Mach number
Sound is transmitted through a medium. The medium can be
(a) Solid
(b) Liquid
(c) Gas
(d) Solid, liquid or gas
Option d – Solid, liquid or gas
An underwater explosion is caused near the seashore. There are two observers, X under water and Y on land, each at a distance of 1 km from the point of explosion
(a) X will hear the sound earlier
(b) Y will hear the sound earlier
(c) Both will hear the sound at the same time.
(d) Y will not hear the sound at all
Option a – X will hear the sound earlier
Which of the following statements is wrong?
(a) Sound travels in a straight line
(c) Sound travels in the form of waves
(d) Sound travels faster in a vacuum than in air
Option d – Sound travels faster in a vacuum than in air
Does a sound wave travel from east to west in which direction do the particles of air move?
(a) East-west
(b) North-south
(c) Up and down
(d) None of these
Option a – East-west
The unit of quantity on which the loudness of sound depends is
(a) metre
(b) Hz
(c) metre/second
(d) second
Option b – Hz
During summer, an echo is heard :
(a) sooner than during winter
(b) later than during winter
(c) after the same time as in winter
(d) None of these
Option a – sooner than during winter
A balloon is filled with hydrogen. For sound waves, this balloon behaves like
(a) a converging lens
(b) a diverging lens
(c) a concave mirror
(d) Nothing can be said
Option a – a converging lens
The property of a medium necessary for wave propagation is
(a) inertia
(b) elasticity
(c) low resistance
(d) All of the above
Option d – All of the above
Sitar is a
(a) wind instrument
(b) stringed instrument
(c) percussion instrument
(d) reed instrument
Option b – stringed instrument
Sound cannot travel through
(a) solids
(b) liquids
(c) gases
(d) vacuum
Option d – vacuum
To hear a distinct echo, the minimum distance of a reflecting surface should be :
(a) 17 metres
(b) 34 metres
(c) 68 metres
(d) 340 metres
Option a – 17 metres
Sound can be characterized by its
(a) frequency only
(b) amplitude only
(c) speed only
(d) frequency, amplitude and speed
Option d – frequency, amplitude and speed
Which one of the following materials will reflect sound better?
(a) Thermocole
(b) Curtain made from cloth
(c) Steel
(d) Paper
Option c – Steel
The material used for making the seats in an auditorium has sound-absorbing properties. Why?
(a) It reduces reverberations.
(b) It makes the quality of sound better
(c) It makes the sound travel faster
(d) All of the above
Option a – It reduces reverberations
A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case
(a) the sound will be louder but the pitch will not be different
(b) the sound will be louder and the pitch will also be higher
(c) the sound will be louder but the pitch will be lower
(d) both loudness and pitch will remain unaffected
Option a – the sound will be louder but the pitch will not be different
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting
(a) the intensity of sound only
(b) the amplitude of sound only
(c) the frequency of the sitar string with the frequency of other musical instruments
(d) the loudness of sound
Option c – the frequency of the sitar string with the frequency of other musical instruments
The amount of sound energy passing each second through a unit area is called
(a) Loudness or Intensity of sound
(b) Amplitude of sound
(c) Pitch of the sound
(d) Frequency of sound
Option a – Loudness or Intensity of sound
Speed of sound.
(a) Decreases, when we go from a solid to a gaseous state
(b) Increases with an increase in temperature
(c) Depends upon properties of the medium through which it travels
(d) All these statements are correct
Option d – All these statements are correct
Sound waves have the following frequencies that are audible to human beings
(a) 5 c/s
(b) 27000 c/s
(c) 5000 c/s
(d) 50,000 c/s
Option c – 5000 c/s
How fast will a wave travel in air at a temperature of 15°C?
(a) 220 m/s
(b) 340m/s
(c) 100 m/s
(d) 150m/s
Option b – 340m/s
Speed of sound at constant temperature depends on
(a) pressure
(b) the density of the gas
(c) both (a) & (b)
(d) None of the above
Option d – None of the above
The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as
(a) Transverse wave
(b) Longitudinal waves
(c) Propagated waves
(d) None of these
Option a – Transverse wave
Echo is a type of
(a) reflected sound
(b) refracted sound
(c) polarised sound
(d) None of these
Option a – reflected sound
Sound is a
(a) mechanical wave
(b) electromagnetic wave
(c) longitudinal wave
(d) Both (a) and (c)
Option d – Both (a) and (c)
Water waves are
(a) longitudinal
(b) transverse
(c) both longitudinal and transverse
(d) Neither longitudinal nor transverse
Option c – both longitudinal and transverse
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