Subject Experts Solutions for Exercise 1: PRACTICE QUESTIONS (CLASSROOM WING)

Raju started a piece of work when the hours hand and minutes hand in a wall clock are at $9$ and $12$, respectively. He completed his work when the hours hand is at a midway between $11$ and $12$, while the position of the minutes hand is at $6$. Find the time taken by him to do the work.

If a bus moves from A to B and comes back to A, find the displacement and velocity of the body.

What is the speed of a body if it covers a distance of $20 \mathrm{m}$ in $4 \mathrm{seconds}$?

 Find the acceleration of the car, if it changes its velocity from $20 \mathrm{m} {\mathrm{s}}^{-1}$ to $30 \mathrm{m} {\mathrm{s}}^{-1}$ in $5 \mathrm{seconds}$.

Given that the time taken by an oil dropper to drop $100$ oil drops is $800 \min$, find the time taken to drop $10$ oil drops in hours.

On dropping $3$ identical bullets into a measuring jar containing a liquid, the level of the liquid increased from $280 {\mathrm{cm}}^3$ to $316 {\mathrm{cm}}^3$. Then the volume of each bullet is _____ ${\mathrm{m}}^3$.

An object 'X' of volume $200 {\mathrm{cm}}^3$ and another object Y of volume $250 {\mathrm{cm}}^3$ are taken. If their area is the same, then determine the ratio of their heights.

Four spheres made of different materials but having the same mass, have a radii of $100 \mathrm{mm}$, $2 \times {10}^{-2} \mathrm{m}$, $30 \mathrm{cm}$ and ${10}^{-5} \mathrm{km}$ then arrange them in ascending order of their volumes.