Question

Q. 1)can you tell me the names of a few transports of ancient days, which are now obsolete?
Q. 2) can you tell me, what is the relationship between km and cm?
3) Why can a pace or a footstep not be used as a standard unit of length?
4) Arrange the following lengths in their increasing magnitude:
1 metre, 1 centimetre, 1 kilometre,1 millimetre, 1 decimetre, 1 decametre.
5) The height of a person is 1.65 m. Express it into cm and mm.
6) The distance between Radha's home and her school is 3250 m. Express this distance in km.

Answer 1

Answer:

1) Sledges, Horse carts, Coal Engine Trains

2) 100cm = 1m

1000m = 1km

Therefore, 1km = 100,000 cm

3) Pace and footstep are not used as a standard unit of length because they vary from person to person and thus, are not reliable.

4) 1 millimetre < 1 centimetre < 1 decimetre < 1 metre < 1 decametre < 1 kilometre

5) The height of the person = 1.65 m

1 m = 100 cm

Therefore the height of the person in cm = (1.65×100) cm = 165 cm

1 cm = 10 mm

Therefore, the height of the person in mm = (165×10) mm = 1650 mm

6) The distance between Radha's home and school = 3250 m

1000 m = 1 km

Therefore, the distance from her home to school in km =

$\frac{3250}{1000} km = 3.25 \: km$