Sound Test

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Sound Test - 58

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Question 1
1 / -0

Sound can be produced by

A
plucking a string.

B
striking a drum.

C
blowing a horn.

D
all of the above.

Solution

$$\textbf{Explanation}$$
Sound is a type of energy made by vibrations. When an object vibrates, it causes movement in the surrounding air molecules, thus producing sound.

Hence, Option (D) is correct.
Question 2
1 / -0

We find it difficult to hear if we put cotton in our ears. This is because

A
cotton damps the sound wave before reaching the ear drum

B
cotton creates a vacuum in the ear

C
cotton conducts the vibration to the ear drum

D
none of the above is true

Solution

Cotton act as a sound absorber so when we put it inside the ear, damps the vibration entering the ear. and when the damped sound reaches the eardrum, its vibration becomes lower than the original. So, we find it difficult to hear.
Question 3
1 / -0

Which energy causes compression and rarefaction in air when tuning fork vibrates?

A
Light Energy

B
Sound Energy

C
Potential Energy

D
Mechanical Energy

Solution

Sound is produced due to the vibration of different objects. Sound travels as successive compressions and rarefactions in the medium.
Sound energy causes compression and rarefaction in the air when the tuning fork vibrates.
Question 4
1 / -0

How it is helpful to locate submarines of enemies through SONAR?

A
It produces ultrasound in water

B
It produces infrasonic in water

C
It produces ultrasound and infrasound in water

D
None

Solution

SONAR produces ultrasound in water which helps in detectinging submarines of enemies in water.
Question 5
1 / -0

What all properties are detected on basis of speed and nature of reflected ultrasound waves?

A
Shape and position of object

B
Shape and height of object

C
Shape and size of object

D
Weight and position of object

Solution

Ultrasound imaging is based on the same principles involved in the sonar used by bats, ships and fishermen. When a sound wave strikes an object, it bounces back, or echoes. By measuring these echo waves, it is possible to determine how far away the object is as well as the object's size, shape and consistency.
Shape and position of object are detected on basis of speed and nature of reflected ultrasound waves.
Question 6
1 / -0

When vibrating string moves towards the left

A
it lowers pressure to right

B
it lowers pressure to left

C
it lowers pressure to center

D
it increases pressure to right

Solution

When a vibrating string moves towards the left, it compresses the air molecules on the left side. So, compression will be created on the left side. But the molecules on the right side will be relaxed and hence it will be a rarefaction or a lower pressure side.
Question 7
1 / -0

Where SONARs are fitted?

A
Over ships and submarines

B
Below ships and submarines

C
Beside ships and submarines

D
none

Solution

As seen in diagram.
SONARs are fitted below ships and submarines to locate the enemies under water by sending ultrasonic waves from below fitted sonar and then by detecting the reflected wave from any underwater object and calculating time elapsed ,it become easy to calculate the distance of any object below ship.
Question 8
1 / -0

How the waves are analysed in water with the help of computer?

A
Ultrasonic waves return after reflection from anything in the water

B
Infrasonic waves return after reflection from anything in the water

C
Ultrasonic waves never return after reflection from anything in the water

D
Ultrasonic waves return after refraction from anything in the water

Solution

Ultrasonic waves return after reflection from anything in the water.
SONAR works using ultrasonic waves. A transmitter and receiver are used in SONAR techniques. The whole device has been loaded into the ship. Ultrasonic waves or ultrasound are generated by the transmitter. These waves travel across water. Waves pass through water and hit objects submerged or on the seabed. These waves are reflected by objects or the seabed after they strike. As a result, the receiver collects these waves. The ultrasonic waves are then converted into electrical signals by computers, which are studied to determine underwater conditions and obstacles.
Question 9
1 / -0

What is multiple reflection of sound?

A
Process in which sound waves bounces off obstacles and reflects many times before reaching the destination

B
Process in which sound waves penetrates in obstacles and reflects many times before reaching the destination

C
Process in which sound waves bounces off obstacles and deflects one time before reaching the destination

D
None

Solution

Process in which sound waves bounces off obstacles and reflects many times before reaching the destination is known as multiple reflections of sound
Question 10
1 / -0

How longitudinal waves are different from other waves?

A
Particles of medium move in a direction parallel to direction of energy transport

B
Particles of medium move in a direction perpendicular to direction of energy transport

C
Particles of medium move in a direction below to direction of energy transport

D
None

Solution

Longitudinal waves are different from the others waves because in longitudinal waves particles of medium move in a direction parallel to direction of energy transport for longitudinal waves.

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Sound Test - 58

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Sound Test - 58

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SHARING IS CARING

Question 1

plucking a string.

striking a drum.

blowing a horn.

all of the above.

Solution

Question 2

cotton damps the sound wave before reaching the ear drum

cotton creates a vacuum in the ear

cotton conducts the vibration to the ear drum

none of the above is true

Solution

Question 3

Light Energy

Sound Energy

Potential Energy

Mechanical Energy

Solution

Question 4

It produces ultrasound in water

It produces infrasonic in water

It produces ultrasound and infrasound in water

None

Solution

Question 5

Shape and position of object

Shape and height of object

Shape and size of object

Weight and position of object

Solution

Question 6

it lowers pressure to right

it lowers pressure to left

it lowers pressure to center

it increases pressure to right

Solution

Question 7

Over ships and submarines

Below ships and submarines

Beside ships and submarines

none

Solution

Question 8

Ultrasonic waves return after reflection from anything in the water

Infrasonic waves return after reflection from anything in the water

Ultrasonic waves never return after reflection from anything in the water

Ultrasonic waves return after refraction from anything in the water

Solution

Question 9

Process in which sound waves bounces off obstacles and reflects many times before reaching the destination

Process in which sound waves penetrates in obstacles and reflects many times before reaching the destination

Process in which sound waves bounces off obstacles and deflects one time before reaching the destination

None

Solution

Question 10

Particles of medium move in a direction parallel to direction of energy transport

Particles of medium move in a direction perpendicular to direction of energy transport

Particles of medium move in a direction below to direction of energy transport

None

Solution

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