Grade 6 Science Chapter 2 Quiz

The two main components of every measurement are a numerical value and a unit.

Standard units of measurement are necessary to maintain uniformity and reliability, as human body parts vary in size among individuals.

The SI unit of length is the metre (m), defined as the distance between two fine marks on a platinum-iridium bar at the International Bureau of Weights and Measures.

<p>Rulers and metre scales are used for general length measurement, while vernier calipers and screw gauges are used for measuring small lengths.</p> Signup and view all the answers

<p>Multiple units like kilometres allow for measuring larger distances, while submultiple units like centimeters and millimeters are used for smaller measurements.</p> Signup and view all the answers

<p>A light year is the distance that light travels in one year, used to measure vast distances, such as those between stars.</p> Signup and view all the answers

<p>Unit symbols should be written in lowercase, except for units named after scientists, and symbols should never be followed by a full stop.</p> Signup and view all the answers

<p>Microns (µ) and angstroms (Å) are used to measure very small lengths, such as the sizes of atoms and molecules.</p> Signup and view all the answers

<p>A stopwatch is used to measure the time taken for a particular event.</p> Signup and view all the answers

<p>The two commonly used units for measuring temperature are degree Celsius (°C) and degree Fahrenheit (°F).</p> Signup and view all the answers

<p>The SI unit for temperature is Kelvin.</p> Signup and view all the answers

<p>A laboratory thermometer measures temperature by the expansion or contraction of mercury in a capillary tube.</p> Signup and view all the answers

<p>A clinical thermometer measures a person's body temperature.</p> Signup and view all the answers

<p>The relation to convert Celsius to Fahrenheit is $C/100 = (F-32)/180$.</p> Signup and view all the answers

<p>Accuracy in measurements refers to the closeness of a measured value to the true value.</p> Signup and view all the answers

<p>A correct metre scale has arrow signs at both ends and contains a stamp of approval.</p> Signup and view all the answers

<p>The typical range of a clinical thermometer is from 35°C to 42°C.</p> Signup and view all the answers

<p>The Department of Weights and Measures in India maintains the correctness of weights and measuring devices across the country.</p> Signup and view all the answers

<p>Parallax error occurs when the eye is not positioned vertically above the measurement point. It can be minimized by ensuring proper eye alignment with the measuring scale.</p> Signup and view all the answers

<p>Place two wooden blocks parallel to each other on either side of the sphere, then measure the inner distance between the blocks, which equals the diameter of the spherical object.</p> Signup and view all the answers

<p>Use a thread to trace along the length of the curved line, then measure the length of the thread with a ruler to find the length of the curved object.</p> Signup and view all the answers

<p>Wind the wire tightly around a pencil and measure the thickness of multiple turns, then divide to find the diameter of one turn.</p> Signup and view all the answers

<p>Stack the one-rupee coins and measure the total thickness of the stack, then divide by the number of coins to find the thickness of one coin.</p> Signup and view all the answers

<p>1 foot is equal to 30.48 centimeters since 1 inch equals 2.54 centimeters and there are 12 inches in a foot.</p> Signup and view all the answers

<p>The SI unit of mass is kilogram (kg), while weight is the force of gravity acting on an object, which can vary based on location.</p> Signup and view all the answers

<p>A beam balance measures mass by comparing weights on two pans, needing equal mass pans and equal length arms for accurate readings.</p> Signup and view all the answers

<p>Ensure the balance is leveled, avoid measuring hot objects, and protect it from air currents and dust during use.</p> Signup and view all the answers

<p>An electronic balance converts the force from an object on the pan into an electrical signal, which is then displayed as mass on a digital screen.</p> Signup and view all the answers

<p>The SI unit of time is the second (s), defined as the interval between two events, specifically as 1/86400 parts of a solar day.</p> Signup and view all the answers

<p>An irregular shape can be traced on graph paper, and the number of squares that are fully or partially covered by the shape can be counted to estimate the area.</p> Signup and view all the answers

<p>A physical balance typically consists of a beam, two scale pans, a pointer, and knife edges made from hard materials like steel or agate.</p> Signup and view all the answers

<p>Mass is the amount of matter in an object and remains constant, while weight is the gravitational force on that mass and can vary with location.</p> Signup and view all the answers

<p>Keeping electronic balances dry prevents damage and they must be calibrated regularly to ensure accurate readings.</p> Signup and view all the answers