Water: A Precious Resource — Science STD 7 — Question

Which of the following plant helps to prepare medicine?

Pins are stuck to a metal strip with wax and a burning candle is kept below the rod, as shown in Fig. Which of the following will happen?

Nearly all the clocks make use of:

A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because:

A student took a half-filled test tube with dilute hydrochloric acid and a few drops of phenolphthalein in the solution. As he put a few drops of sodium hydroxide into the solution, it turns to light pink. Further, he put a few extra drops of acid and observe that the colour disappears. What caused the colour to disappear from the solution?

The mirror used in scooters, cars etc. to see the vehicles coming from the back is:

The water bearing layer of the earth is called:

Food of the caterpillar in case of silk moth is:

Name the device used for measuring Temperature.