Mindful Eating: A Path to a Healthy Body — Science STD 6 — Question

How do you measure temperature using a laboratory thermometer? What precautions should be taken when using a laboratory thermometer?

Give some examples of changes which take place on their own.

What is meant by a renewable energy source?

You have to cost the shadow of your pencil on the wall with the help of candle in a dark room. How can you obtain the shadow of same size, small size and big size of the same pencil?

What do you think of Raman’s statement, “All starches are carbohydrates but not all carbohydrates are starches.” Describe the design of an activity to test your answer.

Activity.

1. Make a mixture of dry sand with sawdust or powdered dry leaves. Keep this mixture on a plate or a newspaper. Look at this mixture carefully.

Can the two different components be made out easily? Are the sizes of particles of the two; components similar? Would it be possible to separate the components by handpicking?

2. Now, take your mixture to an open ground and stand on a raised platform. Put the mixture in a plate or sheet of paper. Hold the plate or the sheet of paper containing the mixture, at your shoulder height. Tilt it slightly, so that the mixture slides out slowly.

What happens? Do both the components– sand and sawdust (or powdered leaves) fall at the same place? Is there a component that blows away? Did the wind manage to separate the two components?

Write the difference between natural and synthetic fibres.

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

How do non-contact thermometers work, and what are their benefits?