Question

The distance between Delhi and Mumbai is usually expressed in units of (a) decameter (b) meter (c) centimeter (d) kilometer

• A. (a) decameter
• B. (b) meter
• C. (c) centimeter
• D. (d) kilometer

Answer 1

The correct option is D

(d) kilometer

Correct Answer: (d) kilometer

Explanation:

Correct Option: (d)

As we know the distance between Delhi and Mumbai is around$1400km$. The largest unit among the given options is used for larger distances if the distance is less than a light-year.

Incorrect Options:

Option (a): decameter

If we use a decameter which is equal to $10m$ the distance of $1400km$ will be equal to$\left(1400km\right)\left(1000m/1km\right)\left(1dam/10m\right)=140000dam$, which is not a suitable quantity.

Option (b): meter

If we measure distance in meters then it will be equal to $\left(1400km\right)\left(1000m/1km\right)=1400000$ which is $1.4million$ meter this is also not a suitable quantity.

Option (c): centimeter

If we use the centimeter to measure the same distance then it will be $\left(1400km\right)\left(1000m/1km\right)\left(100cm/1m\right)=140000000$ which is $140million$ centimeter, so we avoid using such small units to measure large distances to avoid writing large quantities in the result.

Hence the distance between Delhi and Mumbai is measured in Kilometers.