Fibre to Fabric — Science STD 7 — Question

Give examples of insulators.

If a liquid turns blue litmus red, is it an acid, base or salt?

On which date does the Northern Hemisphere experience winter solstice?

Mention the name of the two devices that work on the basis of magnetic effects of current.

Do you think that one possibility could be using a turmeric solution for the spraying liquid and a soap solution for writing on the paper?

Is it possible to obtain the image on the screen when the candle is too closed to the concave mirror?

Classify the changes involved in the following processes as physical or chemical changes: Digestion of food

Which will cool faster-water kept in a black pot or kept in a silver pot?

How do you define heat flow?

State whether the following statements are True or False: A very high pressure system with very high speed wind surrounding it forms a cyclone.