Test: Motion - Class 7 MCQ

Uniform motion is defined by an object covering equal distances in equal intervals of time at a constant speed. If the direction changes, it cannot be classified as uniform motion, even if the speed remains constant.

The SI unit of velocity is meter per second (m/s), which combines both the speed of an object and its direction. Unlike speed, velocity requires a directional component for full description.

Non-periodic motion is characterized by a lack of regularity in the timing of its repetitions. For example, a football player running around the field exhibits non-periodic motion as their speed and path can change unpredictably.

The term "rest" refers to a state where an object does not change its position relative to its surroundings. For instance, a book lying on a table is at rest because its position remains constant over time compared to the table.

Periodic motion is defined as motion that repeats at regular intervals. The pendulum of a clock swinging back and forth fits this definition, as it consistently returns to the same position after a fixed time.

Mass is defined as the amount of matter contained in an object. It is a constant quantity that does not change regardless of the object's location or gravitational influence.

Non-uniform speed occurs when an object travels unequal distances in equal time intervals. This means that the object's speed is changing, as seen when a car speeds up and slows down in traffic.

Weight is the force of gravity acting on an object. If there is no acceleration due to gravity, such as in space, the weight of the object effectively becomes zero, even though its mass remains unchanged.

The primary difference is that mass measures the amount of matter in an object, while weight measures the force exerted on that mass by gravity. Mass remains constant regardless of location, while weight can change with varying gravitational forces.

Periodic motion is defined as motion that repeats itself after a fixed interval of time, such as the swinging of a pendulum or the rotation of a ferris wheel.

An object can have an average velocity of zero if it returns to its starting point, such as a ball that is thrown up and caught at the same height. The total displacement in this case is zero, leading to an average velocity of zero.

Uniform velocity occurs when an object travels equal distances in equal time intervals, maintaining a consistent direction. For example, a train traveling steadily on a straight track exhibits uniform velocity throughout its journey.

The correct formula to calculate speed is Speed = Distance ÷ Time. This formula shows how distance covered relates to the time taken, allowing us to determine how fast an object is moving.

Translatory motion is characterized by all parts of an object moving the same distance simultaneously. This type of motion can be seen in a car moving straight down a road.

Random motion is characterized by the unpredictable movement of an object that does not follow a specific path. Examples include a balloon releasing air and moving erratically or a mosquito flying around.