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Assertion & Reason Test: Waves - NEET MCQ


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10 Questions MCQ Test Topic-wise MCQ Tests for NEET - Assertion & Reason Test: Waves

Assertion & Reason Test: Waves for NEET 2024 is part of Topic-wise MCQ Tests for NEET preparation. The Assertion & Reason Test: Waves questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Waves MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Waves below.
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Assertion & Reason Test: Waves - Question 1

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : Two persons on the surface of moon cannot talk to each other.

Reason : There is no atmosphere on moon.

Detailed Solution for Assertion & Reason Test: Waves - Question 1
Sound waves require material medium to travel. As there is no atmosphere (vacuum) on the surface of moon, therefore the sound waves cannot reach from one person to another.
Assertion & Reason Test: Waves - Question 2

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : Sound waves cannot propagate through vacuum but light waves can.

Reason : Sound waves cannot be polarised but light waves can be polarised.

Detailed Solution for Assertion & Reason Test: Waves - Question 2
Sound waves cannot propagate through vacuum because sound waves are mechanical waves. Light waves can propagate through vacuum because light waves are electromagnetic waves. Since sound waves are longitudinal waves, the particles moves in the direction of propagation, therefore these waves cannot be polarised.
Assertion & Reason Test: Waves - Question 3

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : Ocean waves hitting a beach are always found to be nearly normal to the shore.

Reason : Ocean waves are longitudinal waves.

Detailed Solution for Assertion & Reason Test: Waves - Question 3
Ocean waves are transverse waves travelling in concentric circles of ever increasing radius. When they hit the shore, their radius of curvature is so large that they can be treated as plane waves. Hence they hit the shore nearly normal to the shore.
Assertion & Reason Test: Waves - Question 4

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : Transverse waves travel through air in an organ pipe.

Reason : Air possesses only volume elasticity.

Detailed Solution for Assertion & Reason Test: Waves - Question 4
Since transverse wave can propagate through medium which posses elasticity of shape. Air posses only volume elasticity therefore transverse wave cannot propagate through air.
Assertion & Reason Test: Waves - Question 5

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : The basic of Laplace correction was that, exchange of heat between the region of compression and rarefaction in air is not possible.

Reason : Air is a bad conductor of heat and velocity of sound in air is large.

Detailed Solution for Assertion & Reason Test: Waves - Question 5
According to Laplace, the changes in pressure and volume of a gas, when sound waves propagated through it, are not isothermal, but adiabatic. A gas is a bad conductor of heat. It does not allow the free exchange of heat between compressed layer, rarefied layer and surrounding.
Assertion & Reason Test: Waves - Question 6

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : When we start filling an empty bucket with water, the pitch of sound produced goes on decreasing.

Reason : The frequency of man voice is usually higher than that of woman.

Detailed Solution for Assertion & Reason Test: Waves - Question 6
A bucket can be treated as a pipe closed at one end. The frequency of the note produced = u/4L, here L equal to depth of water level from the open end. As the bucket is filled with water L decreases, hence frequency increases. Therefore, frequency or pitch of sound produced goes on increasing. Also, the frequency of woman voice is usually higher than that of man.
Assertion & Reason Test: Waves - Question 7

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : Solids can support both longitudinal and transverse waves but only longitudinal waves can propagate in gases.

Reason : For the propagation of transverse waves, medium must also neccessarly have the property of rigidity.

Detailed Solution for Assertion & Reason Test: Waves - Question 7
For the propagation of transverse waves, medium must have the property of rigidity. Because gases have no rigidity, (they do not posses shear elasticity), hence transverse waves cannot be produced is gases. On the other hand, the solids possess both volume and shear elasticity and likewise both the longitudinal and transverse waves can be transmitted through them.
Assertion & Reason Test: Waves - Question 8

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : The speed of sound in solids is maximum though their density is large.

Reason : The coefficient of elasticity of solid is large.

Detailed Solution for Assertion & Reason Test: Waves - Question 8

The velocity of sound in solid is given by,

Though ρ is large for solids, their coefficient of elasticity E is much larger (compared to that of liquids and gases). That is why v is maximum in case of solid.

Assertion & Reason Test: Waves - Question 9

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : On a rainy day sound travel slower than on a dry day.

Reason : When moisture is present in air the density of air increases.

Detailed Solution for Assertion & Reason Test: Waves - Question 9
When moisture is present in air, the density of air decreases. It is because the density of water vapours is less than that of dry air. The velocity of sound is inversely proportional to the square root of density, hence sound travel faster in moist air than in the dry air. Therefore, on a rainy day sound travels faster than on a dry day.
Assertion & Reason Test: Waves - Question 10

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : To hear distinct beats, difference in frequencies of two sources should be less than 10.

Reason : More the number of beats per sec more difficult to hear them.

Detailed Solution for Assertion & Reason Test: Waves - Question 10
According to the property of persistence of hearing, the impression of a sound heard persists on our mind for 1/10 sec. Therefore, number of beats per sec should be less than 10. Hence difference in frequencies of two sources must be less than 10.
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