Sound English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

9th Standard

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

Science

Time : 00:10:00 Hrs
Total Marks : 10

    Part A

    10 x 1 = 10
  1. Sound travels in air:

    (a)

    if there is no moisture in the atmosphere.

    (b)

    if particles of medium travel from one place to another.

    (c)

    if both particles as well as disturbance move from one place to another.

    (d)

    if disturbance moves.

  2. If the speed of a wave is 340 m s-1 and its frequency is 1700 Hz, then wavelength λ for this wave in cm will be

    (a)

    34

    (b)

    20

    (c)

    15

    (d)

    0.2

  3. The maximum speed of vibrations which produces audible sound will be in

    (a)

    seawater

    (b)

    ground glass

    (c)

    dry air

    (d)

    Human blood

  4. The sound waves travel faster

    (a)

    in liquids

    (b)

    in gases

    (c)

    in solids

    (d)

    in vacuum

  5. The speeds of sound in four different media are given below. Which of the following is the most likely speed in m s-1 with which the two under water whales in a sea can talk to each other when separated by a large distance?

    (a)

    5170

    (b)

    1280

    (c)

    340

    (d)

    1530

  6. The velocities of sound waves in four media P, O, Q, R and S are 18,00 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which could be a liquid medium?

    (a)

    R

    (b)

    Q

    (c)

    P

    (d)

    S

  7. What name is given to the aricrafts which fly at speeds greater than the speed of sound?

    (a)

    Ultrasonic jets

    (b)

    Infrasonic jets

    (c)

    Supersonic jets

    (d)

    Regular jets

  8. Which of the following sound is not the cause of noise pollution?

    (a)

    Loud speaker

    (b)

    Horn of vehicle

    (c)

    Explosion

    (d)

    Television

  9. A small bee produces sound, while it moves, the sound is created due to _____________.

    (a)

    grinding its teeth

    (b)

    Friction due to air

    (c)

    flapping of wings

    (d)

    sound due to its vocal chord

  10. The phenomenon of echo of sound waves is due to _____________.

    (a)

    Reflection

    (b)

    Interference

    (c)

    Diffraction

    (d)

    All of the above

*****************************************

Reviews & Comments about 9th Standard Science Sound English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

Write your Comment