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11
The area of high density of particles in the medium at the time of sound transmission is called:
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Answer & Solution
Answer: Option D
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12
The Doppler's effect is applicable for
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Answer: Option D
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13
Assertion (A): Radio waves bend in a magnetic field.
Reason (R): Radio waves are electromagnetic in nature.
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Answer & Solution
Answer: Option B
Solution:
Assertion (A): Radio waves bend in a magnetic field.
Reason (R): Radio waves are electromagnetic in nature.

Both Assertion (A) and Reason (R) are true statements:
Assertion (A) is true because radio waves are a type of electromagnetic wave and can be influenced by magnetic fields through a phenomenon called magnetic field refraction.
Reason (R) is also true because radio waves, like all electromagnetic waves, consist of oscillating electric and magnetic fields.

However, Reason (R) does not correctly explain why radio waves bend in a magnetic field. The bending of radio waves in a magnetic field is due to the interaction of the wave with the magnetic field lines, which affects the propagation direction but does not directly relate to the nature of radio waves being electromagnetic.

Therefore, the correct answer is Option B: Both (A) and (R) are true, but (R) is not the correct explanation of (A).
14
To hear a clear echo, the minimum distance between the reflecting surface and the observer should be
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Answer: Option D
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15
What is the distance between two consecutive compressions in a longitudinal wave?
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Answer: Option B
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16
What causes sound?
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Answer: Option B
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17
Which of the following is not a transverse wave?
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Answer: Option D
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18
One important characteristic of sound is 'Pitch', which depends upon
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Answer: Option B
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19
Dilution occurs where there is air pressure-
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Answer: Option A
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20
The repeated reflection that results in persistance of sound is called:
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Answer: Option D
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