Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
While sitting in a moving train, when we look outside the window, the trees appear to be moving in opposite direction because their position is changing with respect to us. On the other hand the position of co-passengers is not changing with respect to us, hence they appear to be stationary.
APPEARS IN
संबंधित प्रश्न
State if the following statement is true or false:
In ancient times, a cubit was used to measure the mass of an object.
Answer the following in short.
Which unit will you use to find the length of your notebook and why?
Why can hand span and arm length not be used as standard units of length?
How many centimetres are there in 1m?
Name the measuring device which can be used for measuring the girth of a tree.
Name the device used to measure the following:
Circumference of round table.
State two precautions to be observed while measuring length with the help of a metre scale.
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?
Match the following:
| 1. | Length | a. | Litre |
| 2. | Mass | b. | Seconds |
| 3. | Time | c. | Kilogram |
| 4. | Volume of liquid | d. | Metre |
Four children measure the length of a table which was about 2 m. Each of them used different ways to measure it.
- Sam measured it with a half metre long thread.
- Gurmeet measured it with a 15 cm scale from her geometry box.
- Reena measured it using her hand span.
- Salim measured it using a 5 m long measuring tape.
Which one of them would get the most accurate length? Give reason for your answer.
