Three waves are given below.
I. Sound waves
II. Visible light waves
III. X-rays

Which of the above waves cannot be polarised?

I only

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III only

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I and II only

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I and III only

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I, II and III

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Solution

The correct option is A I only
Only the transverse waves can be polarized.
As the sound waves are longitudinal waves in nature whereas visible light rays and X-rays are transverse waves.
Thus sound waves cannot be polarized.

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Digital signals

(i) Do not provide a continuous set of values,

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(iii) Can utilize binary system, and

(iv) Can utilize decimal as well as binary systems.

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(a) (i) and (ii) only

(b) (ii) and (iii) only

(d) All of (i), (ii), (iii) and (iv).

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