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# Sound - Olympiad Level MCQ, Class 9 Science

## 25 Questions MCQ Test Olympiad Preparation for Class 9 | Sound - Olympiad Level MCQ, Class 9 Science

Description
This mock test of Sound - Olympiad Level MCQ, Class 9 Science for Class 9 helps you for every Class 9 entrance exam. This contains 25 Multiple Choice Questions for Class 9 Sound - Olympiad Level MCQ, Class 9 Science (mcq) to study with solutions a complete question bank. The solved questions answers in this Sound - Olympiad Level MCQ, Class 9 Science quiz give you a good mix of easy questions and tough questions. Class 9 students definitely take this Sound - Olympiad Level MCQ, Class 9 Science exercise for a better result in the exam. You can find other Sound - Olympiad Level MCQ, Class 9 Science extra questions, long questions & short questions for Class 9 on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### Time period of a wave in a medium is the time taken by:

Solution:
QUESTION: 4

Amplitude of a longitudinal wave in a medium:

Solution:
QUESTION: 5

Non-mechanical (electromagnetic) wave can propagate in :

Solution:
QUESTION: 6

The linear distance between a compression and a rarefaction or a crest and a trough is :

Solution: The distance between 2 consecutive compressions and rare faction is called wavelength.
so, linear distance between a compression and rarefaction is lambda÷2
QUESTION: 7

A longitudinal wave travels in water from west to east. The direction which the particles of medium move:

Solution:
QUESTION: 8

A stretched string is plucked gently to produce a note. The string is producing:

Solution: Waves in Stretched Strings. A string is a tight wire. When it is plucked or bowed, progressive transverse waves travel along the wire and is reflect at the fixed ends. A progressive sound wave is produced in the surrounding air having a frequency equal to that of the stationary wave in the string.
QUESTION: 9

A stretched slinky is given a sharp push along its length. A wave travels from one end to another. The wave

so produced is :

Solution:
QUESTION: 10

A longitudinal sound wave in air consists:

Solution:
QUESTION: 11

The density of air at some point in a longitudinal sound wave is minimum at an instant. The pressure of air

at that point is :

Solution:
QUESTION: 12

Which of the following is an elastic wave?

Solution: Elastic wave. Elastic wave, motion in a medium in which, when particles are displaced, a force proportional to the displacement acts on the particles to restore them to their original position
and sound wave is similar to it.
QUESTION: 13

Infrasonic vibrations have frequency:

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QUESTION: 14

The range of sonic waves is between:

Solution:
QUESTION: 15

The sound waves having a frequency more than 20,000 Hz are called:

Solution:
QUESTION: 16

The animal which cannot hear ultrasonic waves is :

Solution: Cow cannot hear ultra sound waves. As we know that ultrasound wave have higher frequencies than normal sound wave, but they also have shorter wavelengths. Humans  cannot  hear ultra sound same as Cow also cannot hear ultra sound waves because of frequency ranging between 20Hz to 20 KHz (20,000 Hz). Hence, Ultrasound  cannot be hear by human as same as Cow also cannot hear ultra sound.
QUESTION: 17

The bat hunts it prey by emitting and receiving reflected:

Solution:
QUESTION: 18

A sonic boom is produced in the air when an aircraft flies at a speed:

Solution:
QUESTION: 19

Sound travels fastest in :

Solution:
QUESTION: 20

A boy sitting in a boat fires a gun. An observer P is at a distance of 50 m from the boat. Another observer

Q is a diver, who is 50 m under water. Both hear the sound of gun:

Solution:
QUESTION: 21

When the lightning strikes, we hear multiple of cracks of thunder. These multiple reflections of sound are called:

Solution: Echos are sound waves reflecting on an object to be hear back. Reverberations are sounds that come in groups or are coming after a short interval. So during thunder we mostly experience this.
QUESTION: 22

Hearing of repetition of sound after reflection from a distant object is called:

Solution:
QUESTION: 23

For hearing an echo the minimum distance should be :

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QUESTION: 24

An echo is heard only, if the original sound after reflection should reach the ear in :

Solution:
QUESTION: 25

A bullet is moving at a speed, more than the speed of sound. It is said to be moving at :

Solution: