1. How can a measured length be expressed?
2. Define rest and motion.
3. State two precautions to be observed while measuring length with the help of a metre scale.
4. Name the device used to measure the following:
(a) Size of your shoulder.
(b) Size of your wrist.
(c) Your height.
(d) Your weight.
(e) Cloth for curtain.
(f) Circumference of round table.
5. Give the unit for measuring the following:
(a) Distance between Delhi and Jaipur.
(b) Thickness of a coin.
(c) Length of your eraser.
(d) Length of your shoe lace.
Answers
Answer:
1.The length is the distance between two points. Meter is a used as a standard unit for measuring the length of an object. We measure the length of an object by using a meter scale. A meter scale is graduated (or marked) in 100 centimeters and every centimeter is further divided into 10 divisions called millimeters.
2.Solution: Rest - a body is said to be at rest, if it does not change its position with respect to its surrounding with time. Motion - a body is said to be at motion, if it changes its position with time.
3.Two precautions are: (i) The initial point of distance must coincide with the zero reading of metre scale. (ii) The eye should be kept in line with the point of measurement.
4)a.For measuring the Size of the shoulder use measuring tape.
b)For measuring the Size of the wrist use measuring tape.
c)stadiometer.
d)For measuring your weight use the weighing balance.
e)measuring tape
measuring tapeFor measuring the cloth for curtain use measuring tape.
f)For measuring the Circumference of the round table use measuring tape.
5.a)It is a variant of the metric system based on the Centimetre as the unit of length. So in the CGS system when we will measure the distance between Delhi and Jaipur, it will be measured in Centimetre which is denoted as cm . So we can say that Distance between Delhi and Jaipur is 30,000,000cm.
b)The unit used for measuring the thickness of coin is mm(milimetre).
c)Compared to the metric system an inch equals 2.54 centimeters. Inches are used for smaller lengths such as measuring the length of a pencil or the width of an eraser. Foot - A foot is a unit of length.
d)FootA foot is a customary unit of measurement. There are 12 inches in 1 foot. InchesAn inch is a customary unit of measurement, measured best by a ruler.
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