Measurement of Length and Motion

Tejas and Sneha each measure the same classroom table with their handspans. Tejas gets 8 handspans; Sneha gets 10. Tejas says both counts can be correct — it's the same table, but not the same hands. Sneha says that's impossible: it's one table, so one of them must have counted wrongly. Whose explanation makes sense?

Mehul's ruler is broken at the zero end, so it now starts at the 1 cm mark. He lines up one end of a pencil with the 1 cm mark, and the other end reaches 8.5 cm. Mehul says the pencil is 8.5 cm long. Jyoti says it is 7.5 cm long. Who has read it correctly?

Inaya and Vihaan are reading where the end of an eraser lies on a ruler. Inaya says you must look straight down at the mark from directly above it. Vihaan reads it while looking from the side and says it doesn't matter where your eye is, because the marks on a ruler don't move. Who is measuring the right way?

For a project, Rishabh and Kavisha must measure a winding river drawn on a map. Rishabh lays a straight ruler from one end of the river to the other and reads off the length. Kavisha lays a thread carefully along every bend of the river, marks where the river ends, then straightens the thread against the ruler. Whose method gives the river's real length on the map?

At the park, Rashmi watches her little brother on a swing and says the swing is in periodic motion — it goes to and fro, repeating the same movement again and again. Sparsh says it is circular motion, because the seat moves along a curved path centred on the bar the swing hangs from. Whose description fits the swing better?

Kiara and Rahim are on a train moving at 80 km per hour. Kiara says the passenger asleep in the opposite seat is not moving at all — he hasn't left his seat for an hour. Rahim says whether the passenger is moving depends on what you compare him with: compared with the trees outside, he is moving at 80 km per hour. Who is right?