Physical and Chemical Changes — Science STD 7 — Question

Which of the following is a reversible change?

There Are Given Some Parts Of Digestive System, Choose The Odd One Out:

What is the direction of Monsoon winds in Summer?

The nature of metal oxides is

You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from:

Take some clean iron nails and place them in the three test tubes prepared as under:
Test tube A: Contains boiled water and a thin layer of oil.
Test tube B: Contains dry air.
Test tune C: Testube half-filled with water.
All the test tubes are tightly closed after placing the nails. After some time what will you observe?

To which disease is smoking linked?

A student observes that red ink travels up a plant stem. What should they infer?

Citric acid is found in:

Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size, whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli respectively are