Test: Measurement of Length and Motion - Class 6 MCQ

Measurement is crucial in our daily lives because it allows us to quantify and communicate values in a standardized way, ensuring accuracy and consistency. Whether we're cooking, shopping for fabric, or building something, precise measurements help us achieve the desired outcome and avoid mistakes, making tasks more efficient and reliable.

Traditional methods of measurement using body parts, such as handspans or foot lengths, had a major issue: they were not standardized. Since everyone's body parts are different in size, the measurements varied greatly from person to person, leading to inaccuracies and confusion. This highlighted the need for consistent, standardized units of measurement.

The standard unit of length in the International System of Units (SI) is: Metre

• The metre is the base unit of length in the SI system.
• It is used worldwide for scientific, commercial, and everyday measurements.
• The metre is defined by the distance light travels in a vacuum in 1/299,792,458 of a second.
• This precise definition ensures consistency and accuracy in measurements globally.

If the zero mark of the scale is broken or not visible, you can still measure the length by using any other visible full mark on the scale. In this case, one end of the scale shows 2 cm, and the other end shows 10.8 cm. To find the length of the object, subtract the starting mark (2 cm) from the ending mark (10.8 cm):
10.8 cm - 2 cm = 8.8 cm.

Thus, the length measured is 8.8 cm.

Kilometres are used to measure long distances, such as the distance between cities. A kilometre is equal to 1,000 metres, making it a more practical unit for large-scale measurements like travel distances.

Circular motion occurs when an object moves along a circular path. The hands of a clock move in a circular motion, as they rotate around the center of the clock face. This is a clear example of circular motion. The other options describe linear motion (straight-line motion).

Curved lines can be accurately measured by using a flexible method, such as a thread. The thread is wrapped along the curved line, and then it can be straightened out and measured using a measuring tape or ruler. This method allows for precise measurement of curved lengths, unlike a straight ruler or estimation.

A reference point is a fixed location used to describe the position of an object. It provides a basis for comparison and helps in determining whether an object is in motion or at rest. For example, when giving directions, a landmark can serve as a reference point to describe the position of a place.

Oscillatory motion occurs when an object moves back and forth around a fixed position. Examples of oscillatory motion include the swinging of a pendulum or the movement of a swing. This motion repeats itself in a regular, periodic pattern.

The millimetre (mm) is commonly used to measure small lengths, such as the thickness of a paper. One millimetre is equal to one-thousandth of a metre, making it suitable for measuring small dimensions. The micrometre and nanometre are used for even smaller measurements, typically in scientific fields. The centimetre is also used for small measurements but is larger than a millimetre.