Explanation
$$\textbf{Step - 1: Verify, If we join any points on a circle we get a diameter of the circle}$$
$$\text{A Chord is a line segment that joins any two points of the circle.}$$
$$\text{The endpoints of this line segments lie on the circumference of the circle.}$$
$$\therefore \text{Option (A) is false}$$
$$\textbf{Step - 2: Verify, A diameter of a circle contains the center of the circle}$$
$$\text{Any interval joining two points on the circle and passing through the center is called a}$$
$$\text{diameter of the circle.}$$
$$\therefore \text{Option (B) is True}$$
$$\textbf{Step - 3: Verify, A semicircle is an arc}$$
$$\text{The arc of a circle consists of two points on the circle and all of the points on the circle that lie}$$
$$\text{between those two points.}$$
$$\text{It's like a segment that was wrapped partway around a circle.}$$
$$\text{An arc whose measure equals 180 degrees is called a semicircle since it divides the circle in two}$$
$$\therefore \text{Option (C) is True}$$
$$\textbf{Step - 4: Verify, the length of a circle is called its circumference}$$
$$\text{A Circle is a round closed figure where all its boundary points are equidistant from a fixed point}$$
$$\text{called the center.}$$
$$\text{The two important metrics of a circle is the area of a circle and the circumference of a circle.}$$
$$\therefore \text{Option (D) is True}$$
$$\textbf{Hence, option A is correct as it is false}$$
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