SSC CHSL 2025 PYQ — Question 87

The correct answer is Option 2: A change in its state of motion.
Explanation:
In Physics, when there is a change in an object's speed, its direction of motion, or both, it is referred to as a 'change in the state of motion' of the object.
Effect of Force: An external 'unbalanced force' is required to alter an object's state of motion.
Example: If you push a moving ball, its speed increases. If you place your hand in front of it, it may come to a halt or change its direction. Both of these instances are examples of a change in the state of motion.
Analysis of Other Options:
Option 1 (Change in Mass): Changing an object's speed or direction has no effect on its mass; the mass remains constant.
Option 3 (Change in Shape): Although applying a force can alter an object's shape (such as stretching a rubber band), a change in speed or direction is what directly characterizes a change in the state of motion.
Option 4 (Change in Temperature): A change in motion does not have a direct correlation with temperature.
Additional Facts:
Inertia: The property of an object that resists any change in its state of motion is called 'inertia'.
Velocity: When we combine speed with direction, it is referred to as 'velocity'. A change in the state of motion implies that the object's velocity is changing (a process known as 'acceleration').
Potential Questions for Upcoming Exams:
Question: What is the rate of change of the state of motion called?
Answer: Acceleration.
Question: Which of Newton's laws is known as the 'Law of Inertia'?
Answer: Newton's First Law of Motion.
Question: If the net external force acting on an object is zero, what will be the nature of its state of motion? Answer: It will remain stationary or continue moving in a straight line at a uniform speed.