1. Tardigrade
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  4. Assertion x=A cos ω t represents a periodic function. The value of x varies between +A and -A. Reason Amplitude is a vector quantity.

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Q. Assertion $x=A \cos \omega t$ represents a periodic function. The value of $x$ varies between $+A$ and $-A$.
Reason Amplitude is a vector quantity.

Oscillations

Solution:

In $x=A \cos \omega t$, since $\cos \omega t$ varies between $+1$ to $-1$, thus the value of $x$ varies between $+A$ and $-A$.
Amplitude $A$ is a scalar quantity.
Therefore, Assertion is correct but Reason is incorrect.