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Statement I Sound waves cannot propagate in vacuum.<br>Statement II Sound waves are elastic waves and require a medium to propagate.
A
Both the statements are true and statement II is the correct explanation of statement I
B
Both the statements are true, but statement II is not the correct explanation of statement I
C
Statement I is true, but statement II is false
D
Statement I is false, but statement II is true
Correct Answer:
Both the statements are true and statement II is the correct explanation of statement I
Statement: Sound wave cannot propagate fastest in solids. Reason: Sound wave can propagate slightly in vacuum.
A
Both statement and reason are true and the reason is the correct explanation of the statement
B
Both statement and reason are true but the reason is not the correct explanation of the statement
C
Statement is true but the reason is false
D
Both statement and reason are false
Consider the following statements.
1. In sound waves, the vibrations are perpendicular to the direction in which the wave travels.
2. Sound waves are elastic waves.
Which of the statement(s) given above is/are correct?
A
Only 2
B
Only 1
C
Both 1 and 2
D
Neither 1 nor 2
Statement: Sound wave cannot propagate through a vacuum but light can Reason: Sound wave cannot be polarised but light can
A
Both statement and reason are true and the reason is the correct explanation of the statement
B
Both statement and reason are true but the reason is not the correct explanation of the statement
C
Statement is true but the reason is false
D
Both statement and reason are false
Large, medium and small ships are used to bring water. 4 large ships carry as much water as 7 small ships, 3 medium ships carry the same amount of water as 2 large ships and 1 small ship. 15 large, 7 medium and 14 small ships, each made 36 journeys and brought a certain quantity of water. In how many journeys would 12 large, 14 medium and 21 small ships bring the same quantity ?
A
25
B
29
C
32
D
49
Ultrasonic waves of frequency 3 × 10
5
Hz are passed through a medium, where speed of sound is 10 times that in air (speed of sound in air is 300 m/s). The wavelength of this wave in that medium will be of the order of
A
1 cm
B
10 cm
C
100 cm
D
0.1 cm
Which of the following statement(s) about electromagnetic waves, sound waves and water waves is/are correct?
1. They exhibit reflection.
2. They carry energy.
3. They exert pressure.
4. They can travel in vacuum.
A
1, 2 and 3
B
2 and 4
C
1 and 3
D
Only 1
Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, $$\sigma $$ = yield strength and E = modulus of elasticity)
A
E
B
$$\sigma $$
C
$$\frac{\sigma }{{\text{E}}}$$
D
$$\frac{{\text{E}}}{\sigma }$$
Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?
A
Tensile strength
B
Elastic limit
C
Proportional limit
D
Yield strength
The speed of sound in different medium at 25°C. Which of the following question regarding this statement is/are correct?
A. The speed of sound in oxygen is 316 m/min.
B. The speed of sound in distilled water is 1498 m/min.
A
Both A and B are correct
B
Only A is correct
C
Neither A is correct nor B is correct
D
Only B is correct
Consider the following statements.
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statements given above is/are correct?
A
Only 1
B
Only 2
C
Bath 1 and 2
D
Neither 1 nor 2