Mansi Garg and Jitendra Kumar Solutions for Chapter: Measurements & Experimentation, Exercise 5: CHALLENGERS

The distance of a planet from the Earth is $11$ light minutes. What is the distance in $\mathrm{km}$?

Why length, mass and time are chosen as base quantities in mechanics?

A bus travels $110 \mathrm{km}/\mathrm{h}$ on an open highway. What is this speed in standard SI unit?

The mass of the Earth is $5.98\times {10}^{24 } \mathrm{kg}$. If the average mass of the atoms of the Earth is $40 \mathrm{u}$, then the number of atoms in the Earth is

A vernier callipers has $1 \mathrm{mm}$ mark on the main scale. It has $20$ equal divisions on the vernier scale which match with $16$ main scale divisions. For this vernier callipers, the least count is

A circular scale of a screw gauge has $50$ divisions and pitch $0.5 \mathrm{mm}$. Find the diameter of the sphere (main scale reading is $2$)

Which of the following phenomena can be used as a measure of time?

The length of a pendulum is decreased by $10⁒$. What will be the change in its frequency?