Best Mock Test for SSC CGL

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    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

    Quick Quiz

    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

    (b) Sound is a form of energy

    (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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