Advertisements
Advertisements
प्रश्न
Describe in steps how would you measure the length of a pencil using a metre rule. Draw a diagram if necessary.
उत्तर
To measure the length of a pencil using a metre rule, place metre rule with its marking close to the object. Let PQ be a pencil.
The end P of the pencil coincides with the zero marks on the ruler. The end Q of the pencil is read by keeping the eye at the position ‘B’ vertically above the end Q. So the length of the pencil is 4.3 cm.
Explain with an example of how you will use the metre ruler in part (a) if the ends of a ruler are broken.
Ans. The ends of the ruler get damaged with use and its zero marks may not be visible. To measure the length of an object with such a ruler, the object is placed close to a specific marking on the ruler and positions of both ends of the object are read on the ruler.
The difference between the two readings gives the length of the object. In fig. the reading on the ruler at the end X is 1.0 cm and at the end, Y is 4.3 cm. So the length of the rod XY is 4.3 — 1.0 = 3.3 cm.
APPEARS IN
संबंधित प्रश्न
Name the device used to measure the following:
Size of your wrist.
Name the device used to measure the following:
Your weight.
One metre is ______ cm.
Five kilometre is ______ m.
Why would you not like to use a measuring tape made of an elastic material like rubber to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with such a tape?
The area can be calculated by using the two lengths and width.
Match the following:
| 1. | Length | a. | Litre |
| 2. | Mass | b. | Seconds |
| 3. | Time | c. | Kilogram |
| 4. | Volume of liquid | d. | Metre |
You are provided three scales A, B, and C as shown in Fig. to measure a length of 10 cm.
For the correct measurement of the length you will use the scale
SI unit of length is ______
While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.
