Question

Motion that moves to and fro in regular time intervals is called ___________ motion.
A. Vibratory
B. Translatory
C. Rotatory
D. Accelerating

Answer 1

Hint: To find out which of the given options is a to and fro motion in regular time intervals, check each option one by one. Recall the definition of each of the given options and compare them with the to and fro motion. Select the option whose motion matches with to and fro motion in regular time intervals.

Complete answer:
We are asked what to and fro motion in regular time intervals is called.To find the correct option, we will check each option one by one.
Vibratory:- Vibratory motion is a type of motion in which the body moves forward from a mean position, then comes back to its mean position and goes backward, then again comes back to its mean position and the process repeats after regular time interval, in other words we can say vibratory motion is a to and fro motion in regular time intervals. Therefore, option A is correct.
Translatory:- Translatory motion is a type of motion in which the body moves in the same direction, there is no to and fro motion. Therefore, option B is incorrect.
Rotatory:- Rotatory motion is a type of motion in which the body rotates about an axis or we can say it as circular motion and there is no to and fro motion. Therefore, option C is incorrect.
Accelerating:- Accelerating motion is a type of motion in which the velocity of the body changes with time. Therefore, option D is incorrect.

Hence, the correct answer is option A.

Note: Motion of a body can mainly be described in four terms which are distance, displacement, speed and time. We can say in which motion a body is, if we know about these four terms. Also remember vibratory motion can also be called oscillatory motion.