Light, Shadows and Reflections — Science STD 6 — Question

How can you measure the
length of a Curved line accurately?

Why can a pace or a footstep not be used as a standard unit of length?

Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?

How the measurements using body parts to measure length were considered inconsistent?

Can it always be correctly judged, that a person has fever, only by touching the person?

Why could we say that Science is everywhere around us?

While using iodine in the laboratory, a few drops of iodine fell on Mishti’s socks and a few fell on her teacher’s saree. The drops of iodine on the saree turned blue-black while the colour on the socks did not change. What can be a possible reason ?

Paheli wanted to glow a torch bulb using a cell. She could not get connecting wires, instead, she got two strips of aluminium foil. Will she succeed? Explain, how?

Explain two ways in which human activities pollute the air. Propose one action which can help in reducing air pollution.