Anita Sood, Anupama Bhandari, Madhabi Bose and, Shelly Wadhwa Solutions for Exercise 4: ASSESSMENT ZONE

The SI unit of temperature is 

A crystal used to make modern watches-

Name the type of motion which is used in making clocks and watches.

A comparison of unknown quantity with known quantity-

What would be the speed ($\mathrm{in} \mathrm{km}/\mathrm{h}$) of a car if it covers a distance of $400 \mathrm{k}\mathrm{m}$ in $5$ hours?

A train takes $6$ hours to reach Indore from Delhi. If it moves with the speed of $70 \mathrm{k}\mathrm{m}/\mathrm{h}$ find the distance between Indore and Delhi.
Give the solution in terms of kilometre.

Suppose, if answer is $12 \mathrm{km}$, just write $12$ as the answer.

A bus covers a distance of $250 \mathrm{k}\mathrm{m}$ from Delhi to Jaipur in $5 \mathrm{h}$ and returns to Delhi in $4 \mathrm{h}$. If the average speed is $X$ $\mathrm{km}/\mathrm{hr}$ then find  the value of $X$ by rounding off to two decimal places.

The distance-time graph of four bikes $\mathrm{P},\mathrm{Q},\mathrm{R}$ and $\mathrm{S}$ which are moving on a straight road is shown in the given figure. Which of the following statement is correct regarding their motion.